McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 351. |
The hybrid between horse and donkey is called - |
| A. | Pony |
| B. | Colt |
| C. | Mule |
| D. | Zebra |
| Answer» C. Mule | |
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Explanation: The Mule is a cross between a donkey stallion (called a jack) and a horse mare. Mules ears are usually somewhat smaller than a donkeys, longer but the same shape as the horse parents. The mule's conformation will be a combination of traits from both parents. The head, hip and legs usually take after the jack. Mules do not have pronounced arches to the neck, even from breeds such as Arabians or Warm bloods. A slight arch or straight neck is preferable to a ewe, or upward curved neck. |
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| 352. |
Which of the following is not a member of the vitamin B complex? |
| A. | Thiamine |
| B. | Riboflavin |
| C. | Folic acid |
| D. | Ascorbic acid |
| Answer» D. Ascorbic acid | |
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Explanation: Vitamin B complex consists of 8 vitamins namely B1, B2, B3, B5, B6, B7, B 9and B12. Vitamin B1 is Thiamine, Vit B2 is Riboflavin, Vit B3 is Niacin, Vit B5 is pantothenic acid, Vit B6 is pyridoxine, biotin, folic acid and Vit B12 is cyanocobalamin. |
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| 353. |
Cystitis is the infection of which of the following? |
| A. | liver |
| B. | urinary bladder |
| C. | pancreas |
| D. | lung |
| Answer» B. urinary bladder | |
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Explanation: Cystitis is an infection of the urinary tract that is caused by bacteria. Anyone can develop cystitis, although it is more common in women. |
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| 354. |
Which of the following makes the skin layer impervious to water? |
| A. | Collagen |
| B. | Melanin |
| C. | Keratin |
| D. | Chitin |
| Answer» C. Keratin | |
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Explanation: Keratin is a family of fibrous structural proteins. Keratin is the key structural material making up the outer layer of human skin. It is also the key structural component of hair and nails. Keratin monomers assemble into bundles to form intermediate filaments, which are tough and insoluble and form strong un- mineralized tissues found in reptiles, birds, amphibians, and mammals. Cells in the epidermis contain a structural matrix of keratin, which makes this outermost layer of the skin almost waterproof, and along with collagen and elastin, gives skin its strength. |
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| 355. |
'ELISA' test is employed to diagnose - |
| A. | Polio virus |
| B. | AIDS antibodies |
| C. | Tuberculosis bacterium |
| D. | Cancer |
| Answer» C. Tuberculosis bacterium | |
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Explanation: ELISA is an abbreviation for "enzymelinked immunosorbent assay." An ELISA test uses components of the immune system and chemicals to detect immune responses In the body (for example, to infectious microbes). |
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| 356. |
The body temperature is regulated by |
| A. | Pituitory gland |
| B. | Hypothalamus |
| C. | Pineal gland |
| D. | Thyroid gland |
| Answer» B. Hypothalamus | |
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Explanation: Hypothalamus is a portion of the brain that contains a number of small nuclei with a variety of functions. One of the most important functions of the hypothalamus is to link the nervous system to the endocrine system via the pituitary gland (hypophysis). The hypothalamus is responsible for certain metabolic processes and other activities of the autonomic nervous system. It synthesizes and secretes certain neurohormones, often called hypothalamic- releasing hormones, and these in turn stimulate or inhibit the secretion of pituitary hormones. The hypothalamus controls body temperature, hunger, thirst, fatigue, sleep, and circadian cycles. |
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| 357. |
The study of extinct animals is called - |
| A. | Herpetology |
| B. | Ornithology |
| C. | Geology |
| D. | Palaeontology |
| Answer» D. Palaeontology | |
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Explanation: Paleontology is the study of fossils to determine the structure and evolution of extinct animals and plants and the age and conditions of deposition of the rock strata in which they are found. It includes the study of fossils to determine organisms' evolution and interactions with each other and their environments (their paleoecology). As a "historical science" it attempts to explain causes rather than conduct experiments to observe effects. Palaeontological observations have been documented as far back as the 5th century B.C.E. |
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| 358. |
The medical term used for the sleeplessness is - |
| A. | Somnambulism |
| B. | Insomnia |
| C. | Hallucination |
| D. | Nyctinuria |
| Answer» B. Insomnia | |
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Explanation: Insomnia, or sleeplessness, is a sleep disorder in which there is an inability to fall asleep or to stay asleep as long as desired. It is most often thought of as both a sign and a symptom that can accompany several sleep, medical, and psychiatric disorders characterized by a persistent difficulty falling asleep and/or staying asleep or sleep of poor quality. Insomnia is typically followed by functional impairment while awake. Insomnia can occur at any age, but it is particularly common in the elderly. |
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| 359. |
Which one of the following creatures has maximum number of ribs? |
| A. | Crocodile oo |
| B. | Snake |
| C. | Ray fish |
| D. | Flying mammal |
| Answer» B. Snake | |
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Explanation: Snakes have the maximum number of ribs. On an average they have 200 to 400 bones (Vertibrae) and each have a pair of ribs on either side. |
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| 360. |
Which one of the following is most important for the growth of children up to the age of 14? |
| A. | Protein |
| B. | Vitamin |
| C. | Fat |
| D. | Milk |
| Answer» A. Protein | |
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Explanation: Protein is a vital part of a healthy diet for children. This substance, though important for all people, is especially necessary for developing and growing bodies. Protein isused as a source of energy, especially when carbohydrates and fats are at insufficient levels in the diet. In addition, a child needs adequate protein to support the body's production of its own proteins. The manufactured proteins are used in strength maintenance, development of muscles and connective tissues, transportation of oxygen to all areas of the body and antibody production to fight infections. |
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| 361. |
Sweat glands in mammals are primarily concerned with - |
| A. | removal of excess salts |
| B. | excretion of nitrogenous wastes |
| C. | therrnoregulation |
| D. | sex-attraction |
| Answer» C. therrnoregulation | |
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Explanation: Sweat glands, or sudoriferous glands, are small tubular structures of the skin that produce sweat. The cause of sweating and body odor stems from our body's temperature regulation system, specifically our sweat glands. Sweating helps maintain our body temperature, hydrates our skin and balances our body fluids and electrolytes, chemicals in our body such as sodium and calcium. |
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| 362. |
DNA test was developed by – |
| A. | Dr. Alec Jeffreys |
| B. | Dr. V.K. Kashyap |
| C. | Watson and Crick |
| D. | Gregor Mendel |
| Answer» C. Watson and Crick | |
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Explanation: A genealogical. DNA test looks at a person's genetic code at specific locations. Results give information about genealogy or personal ancestry. James D. Watson and Francis Crick are the two scientists who discovered the structure of DNA in 1953. |
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| 363. |
An ECG shows the functioning of the |
| A. | brain |
| B. | heart |
| C. | lungs |
| D. | kidneys |
| Answer» B. heart | |
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Explanation: The electrocardiogram (ECG or EKG) is a diagnostic tool that is routinely used to assess the electrical and muscular functions of the heart. The heart is a two stage electrical pump and the heart's electrical activity can be measured by electrodes placed on the skin. The electrocardiogram can measure the rate and rhythm of the heartbeat, as well as provide indirect evidence of blood flow to the heart muscle. |
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| 364. |
A vitamin requires cobalt for its activity. The vitamin is - |
| A. | Vitamin B12 |
| B. | Vitamin D |
| C. | Vitamin B2 |
| D. | Vitamin A |
| Answer» A. Vitamin B12 | |
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Explanation: Vitamin B12, vitamin B1, or vitamin B12, also called cobalarnin, is a water- soluble vitamin with a key role in the normal functioning of the brain and nervous system, and for the formation of blood. It is one of the eight B vitamins. It is normally involved in the metabolism of every cell of the human body, especially affecting DNA synthesis and regulation, but also fatty acid synthesis and energy production. Vitamin B12 consists of a class of chemically related compounds (vitamers), all of which have vitamin activity. It contains the biochemically rare element cobalt. |
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| 365. |
Plasma membrane in eukaryotic cells is made up of - |
| A. | Phospholipid |
| B. | Lipoprotein |
| C. | Phospholipo-protein |
| D. | Phospho-protein |
| Answer» A. Phospholipid | |
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Explanation: The cell membrane or plasma membrane is a biological membrane that separates the interior of all cells from the outside environment. The cell membrane is selectively permeable to ions and organic molecules and controls the movement of substances in and outof cells. The basic function of the cell membrane is to protect the cell from its surroundings. |
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| 366. |
The locomotory organ of 'Amoeba' is |
| A. | Pseudopodia |
| B. | Parapodia |
| C. | Flagella |
| D. | Cilia |
| Answer» A. Pseudopodia | |
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Explanation: Pseudopods or pseudopodia (singular: pseudopodium) are temporary projections of eukaryotic cells. Cells that possess this faculty are generally referred to as amoeboids. Pseudopodia extend and contract by the reversible assembly of actin subunits into microfilaments. Filaments near the cell's end interact. with myosin which causes contraction. The pseudopodium extends itself until the actin reassembles itself into a network. This is how amoebas move, as well as some cells found in animals, such as white blood cells. They are most commonly found on eubacteria. |
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| 367. |
The number of chromosomes present in normal human being are - |
| A. | 23 |
| B. | 46 |
| C. | 22 |
| D. | 48 |
| Answer» B. 46 | |
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Explanation: A chromosomeis an organized structure of DNA and protein found in cells. It is a single piece of coiled DNA containing many genes, regulatory elements and other nucleotide sequences. Chromosomes also contain DNA- bound proteins, which serve to package the DNA and control its functions. Chromosomes in humans can be divided into two types: autosomes and sex chromosomes. Certain genetic traits are linked to a person's sex and are passed on through the sex chromosomes. |
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| 368. |
The longest bone in the human body is |
| A. | Ulna |
| B. | Humerus |
| C. | Femur |
| D. | Tibia |
| Answer» C. Femur | |
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Explanation: The femur or thigh bone, is the most proximal (closest to the center of the body) bone of the leg in tetrapod vertebrates capable of walking or jumping, such as most land mammals, birds, many reptiles such as lizards, and amphibians such as frogs. In vertebrates with four legs such as dogs and horses, the femur is found only in the rear legs. The femur is the largest bone in the human body. The head of the femur articulates with the acetabulum. By most measures the femur is one of the strongest bones in the body. |
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| 369. |
Which of the following is the smallest bird? |
| A. | Pigeon |
| B. | Parrot |
| C. | Humming bird |
| D. | House sparrow |
| Answer» C. Humming bird | |
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Explanation: Hummingbirds are birds that comprise the family Trochilidae. They are among the smallest of birds, most species measuring in the 7.5-13 cm (3-5 in) range. Indeed, the smallest extant bird species is a hummingbird, the 5-cm Bee Hummingbird. They can hover in mid-air by rapidly flapping their wings 1280 times per second (depending on the species). They are known as hummingbirds because of the humming sound created by their beating wings, which sometimes sound like bees or other insects. |
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| 370. |
The edible part of Cabbage is - |
| A. | fruit |
| B. | condensed flower |
| C. | vegetative bud |
| D. | inflorescence |
| Answer» C. vegetative bud | |
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Explanation: In cabbage, the edible part is vegetative bud. Vegetative buds are buds fromwhich vegetative parts like leaves and stems arise, rather than flowers. Enlarged buds or parts of buds form the edible portion of some horticultural crops. Cabbage and head lettuce are examples of unusually large terminal buds. |
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| 371. |
Which enzyme converts proteins? |
| A. | Pepsin |
| B. | Trypsin |
| C. | Erepsin |
| D. | Enterokinase |
| Answer» B. Trypsin | |
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Explanation: Trypsin is a serine protease found in the digestive system of many vertebrates, where it hydrolyses proteins. Trypsin in the duodenum catalyses the hydrolysis of peptide bonds so that proteins can be broken down into smaller peptides. These peptides may then be further hydrolyzed into amino acids by other proteases before they enter the blood stream. |
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| 372. |
The deficiency of iron in man result in |
| A. | Anaemia |
| B. | Night, blindness |
| C. | Scurvy |
| D. | Rickets |
| Answer» A. Anaemia | |
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Explanation: Anaemia is a condition in which the number of red blood cells or their oxygen- carrying capacity is insufficient to meet physiologic needs, which vary by age, sex, altitude, smoking, and pregnancy status. Iron deficiency is thought to be the most common cause of anaemia globally |
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| 373. |
Protein which renders a cell less susceptible to attack by viruses is called - |
| A. | Actomyosin |
| B. | Chloromycetin |
| C. | Hybridoma |
| D. | Inferon |
| Answer» D. Inferon | |
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Explanation: Interferons are proteins which render the cells less susceptible to attack byviruses. Interferons are proteins made and released by host cells in response to the presence of pathogens such as viruses, bacteria, parasites or tumor cells. |
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| 374. |
Goitre is caused by the deficiency of - |
| A. | Iodine |
| B. | Chlorine |
| C. | Sodium |
| D. | Calcium |
| Answer» A. Iodine | |
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Explanation: A goitre or goiter is a swelling of the thyroid gland, which can lead to a swelling of the neck or larynx. (voice box). Goitre is a term that refers to an enlargement of the thyroid (thyromegaly) and can be associated with a thyroid gland that is functioning properly or not. Worldwide, the most common cause for goitre is iodine deficiency, usually seen in countries that do not use iodized salt. Selenium deficiency is also considered a contributing factor. In countries that use iodized salt, Hashimoto's thyroiditis is the most common cause. |
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| 375. |
Which of the following types of light are strongly absorbed by plants? |
| A. | Violet and orange |
| B. | Blue and red |
| C. | Indigo and yellow |
| D. | Yellow and violet |
| Answer» B. Blue and red | |
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Explanation: As shown in detail in the absorption spectra, chlorophyll absorbs light in the red (long wavelength) and the blue (short wavelength) regions of the visible light spectrum. Green light is not absorbed but reflected. |
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| 376. |
Which acid is present in lemon – |
| A. | malic acid |
| B. | citric acid |
| C. | lactic acid |
| D. | tartaric acid |
| Answer» B. citric acid | |
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Explanation: The main organic acids contained in the flesh of lemons are citric acid and malic acid. The sourness of citrus fruit is the taste of citric acid. |
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| 377. |
Iodoform is used as an : |
| A. | antipyretic |
| B. | analgesic |
| C. | antiseptic |
| D. | anaesthetic |
| Answer» C. antiseptic | |
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Explanation: A pale yellow, crystalline, volatile substance, it has a penetrating odor and, analogous to chloroform, sweetish taste. It is occasionally used as a disinfectant. Around the beginning of the 20th century it was used in medicine as a healing and antiseptic dressing for wounds and sores, although this use is now superseded by superior antiseptics. Adolf Hitler's mother, Mara Hitler, died of iodoform poisoning brought on by her treatment for breast cancer. |
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| 378. |
An instrument for measuring blood pressure is called - |
| A. | Barometer |
| B. | Spirometer |
| C. | Sphygmomanometer |
| D. | Haemocytometer |
| Answer» C. Sphygmomanometer | |
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Explanation: A sphygmomanometer or blood pressure meter is a device used to measure blood pressute, composed of an inflatable cuff to restrict blood flow, and a mercury or mechanical manometer to measure the pressure. It is always used in conjunction with a means to determine at what pressure blood flow is just starting, and at what pressure it is unimpeded. Manual sphygmomanometers are used in conjunction with a stethoscope. The device was invented by Samuel Siegfried Karl Ritter von Basch in 1881. |
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| 379. |
The term 'Rh factor' refers to - |
| A. | Rhesus factor |
| B. | Rheumatoid factor |
| C. | Renal factor |
| D. | Rhombic factor |
| Answer» A. Rhesus factor | |
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Explanation: Each person's blood is one of four major types: A, B, AB, or O. Blood types are determined by the types of antigens on the blood cells. Antigens are proteins on the surface of blood cells that can cause a response from the immune system. The Rh factor (Rhesus factor) is a type of protein on the surface of red blood cells. Most people who have the Rh factor are Rh-positive. |
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| 380. |
Which one of the following is also called the 'power plants' of the cell? |
| A. | Golgi body |
| B. | Mitochondrion |
| C. | Ribosome |
| D. | Lysosome |
| Answer» B. Mitochondrion | |
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Explanation: In cell biology, a mitochondrion (plural mitochondria) is a membrane-enclosed organelle found in most eukaryotic cells. These organelles range from 0.5 to .0 micrometer (im) in diameter. Mitochondria are sometimes described as "cellular power plants" because they generate most of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy. |
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| 381. |
What is the chemical name ofvinegar? |
| A. | Citric acid |
| B. | Acetic acid |
| C. | Pyruvic acid |
| D. | Mahe acid |
| Answer» B. Acetic acid | |
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Explanation: Vinegar is a liquid substance consisting mainly of acetic acid (CH3CO2H) and water, the acetic acid being produced through the fermentation of ethanol by acetic acid bacteria. It is today mainly used in the kitchen as a general cooking ingredient, but historically, as the most easily available mild acid, it had a great variety of industrial, medical, and domestic uses, some of which (such as a general household cleanser) are still promoted today. |
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| 382. |
pH of blood is – |
| A. | 10.4 |
| B. | 9 |
| C. | 7.4 |
| D. | 4 |
| Answer» C. 7.4 | |
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Explanation: A pH of 7 is neutral. The lower the pH, the more acidic the blood. A variety of factors affect blood pH including what is ingested, vomiting, diarrhea, lung function, endocrine function, kidney function, and urinary tract infection. The normal blood pH is tightly regulated between 7.35 and 7.45. |
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| 383. |
Smaller roots coming out of main root is called as . |
| A. | Tap root |
| B. | Lateral root |
| C. | Fibrous root |
| D. | Ring root |
| Answer» B. Lateral root | |
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Explanation: Lateral roots extend horizontally from the primary root (radicle) and serve to anchor the plant securely into the soil. |
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| 384. |
The vitamin that helps to prevent infections in the human body is - |
| A. | vitamin A |
| B. | vitamin B |
| C. | vitamin C |
| D. | vitamin D |
| Answer» C. vitamin C | |
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Explanation: Vitamin C or L-ascorbic acid, or simply ascorbate the anion of ascorbic acid), is an essential nutrient for humans and certain other animal species. Vitamin C is found in high concentrations in immune cells, and is consumed quickly during infections. It is not certain how vitamin C interacts with the immune system: it has been hypothesized to modulate the activities of phagocytes, the production of cytokines and lymphocytes, and the number of cell adhesion molecules in monocytes. |
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| 385. |
The normal RBC count in adult male is |
| A. | 5.5 million |
| B. | 5.0 million |
| C. | 4.5 million |
| D. | 4.0 million |
| Answer» B. 5.0 million | |
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Explanation: An RBC count is a blood test that tells how many red blood cells (RBCs) we have. RBCs contain hemoglobin, which carries oxygen. How much oxygen our body tissues get depends on how many RBCs we have and how well they work. The general the range is as follows: Male: 4.7 to 6.1 million cells per microliter (cells/meld); and Female: 4.2 to 5.4 million cells/meld. |
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| 386. |
Study of newly born up to the age of 3 months is called - |
| A. | Chorology |
| B. | Conchology |
| C. | Nematology |
| D. | Neonatology |
| Answer» D. Neonatology | |
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Explanation: Neonatology is a subspecialty of pediatrics that consists of the medical care of newborn infants, especially the ill or premature newborn infant. It is a hospital-based specialty, and is usually practiced in neonatal intensive care units (NICUs). The principal patients of neonatologists are newborn infants who are ill or requiring special medical care due to prematurity, low birth weight, intrauterine growth retardation, congenital malformations (birth defects), sepsis, pulmonary hyperplasia or birth asphyxial. |
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| 387. |
Which one of the following does not secrete any digestive enzyme? |
| A. | Liver |
| B. | Salivary gland |
| C. | Glands of small intestine |
| D. | Pancreas |
| Answer» A. Liver | |
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Explanation: Digestive enzymes are enzymes that break down polymeric macromolecules into their smaller building blocks, in order to facilitate their absorption by the body. Digestive enzymes are found in the digestive tracts of animals (including humans) and in the traps of carnivorous plants, where they aid in the digestion of food, as well as inside cells, especially in their lysosomes, where they function to maintain cellular survival. Digestive enzymes are diverse and are found in the saliva secreted by the salivary glands, in the stomach secreted by cells lining the stomach, in the pancreatic juice secreted by pancreatic exocrine cells, and in the intestinal (small and large) secretions, or as part of the lining of the gastrointestinal tract. |
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| 388. |
The causative agent of Tuberculosis is |
| A. | Mycobacterium |
| B. | Aspergillus |
| C. | Rhabdovirus |
| D. | HIV. |
| Answer» A. Mycobacterium | |
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Explanation: Mycobacterium is a genus of Actinobacteria, given its own family, the Mycobacteriaceae. The genus includes pathogens known to cause serious diseases in mammals, including tuberculosis and leprosy. Mycobacterial infections are notoriously difficult to treat. The organisms are hardy due to their cell wall, which is neither truly Gram negative nor positive. In addition, they are naturally resistant to a number of antibiotics that disrupt cell-wall biosynthesis, such as penicillin. |
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| 389. |
The enzyme that is present in the saliva of man is - |
| A. | Pepsin |
| B. | Renin |
| C. | Amylase |
| D. | Trypsin |
| Answer» C. Amylase | |
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Explanation: Amylase is an enzyme that catalyses the breakdown of starch into sugars. Amylase is present in human saliva, where it begins the chemical process of digestion. Foodsthat contain much starch but little sugar, such as rice and potato, taste slightly sweet as they are chewed because amylase turns some of their starch into sugar in the mouth. The pancreas also makes amylase (alpha amylase) to hydrolyse dietary starch into disaccharides and trisaccharides which are converted by other enzymes to glucose to supply the body with energy. Plants and some bacteria also produce amylase. As diastase, amylase was the first enzyme to be discovered and isolated. |
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| 390. |
The seeds of certain plants fail to germinate if they do not pass through the digestive tract of fruit-eating birds. This is due to - |
| A. | hibernation |
| B. | seed coat impermeability |
| C. | infertility |
| D. | vegetative reproduction |
| Answer» B. seed coat impermeability | |
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Explanation: A dormant seed is one that is unable to germinate in a specified period of time under a combination of environmental factors that are normally suitable for the germination of the non-dormant seed. Dormancy is a mechanism to prevent germination during unsuitable ecological conditions, but the probability of seedling survival is low. |
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| 391. |
Animals having open circulatory system POSSESSES – |
| A. | coelenteron |
| B. | spongocoel |
| C. | pseudocoel |
| D. | haemocoel |
| Answer» D. haemocoel | |
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Explanation: Open circulatory system is the one in which blood does not circulate only inside blood vessels but it also falls in cavities that irrigate tissues. The internal organs are suspended in a network of blood-filled sinuses or open spaces which collectively form the haemocoel. |
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| 392. |
Which of the following weeds has been found useful to check water pollution caused by industrial affluents? |
| A. | Parthenium |
| B. | Elephant grass |
| C. | Water hyacinth |
| D. | Both (1) and (2) above |
| Answer» C. Water hyacinth | |
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Explanation: Around the world, there is an increasing trend in areas of land, surface waters and groundwater affected by contamination from industrial, military and agricultural activities due to either ignorance, lack of vision, or carelessness. |
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| 393. |
Which of the following is correlated with blood pressure? |
| A. | Liver |
| B. | Testis |
| C. | Pancreas |
| D. | Adrenal |
| Answer» D. Adrenal | |
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Explanation: Blood pressure is an important indicator of adrenal health and function. Mild adrenal weakness is usually accompanied by normal to high blood pressure. As Adrenal Fatigue advances, low blood pressure, at rest or related to posture becomes more prevalent. |
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| 394. |
Blood cancer is otherwise called as - |
| A. | Anaemia |
| B. | Polycythemia |
| C. | Leucopenia |
| D. | Leukaemia |
| Answer» D. Leukaemia | |
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Explanation: Leukemia is a type of cancer of the blood or bone marrow characterized by an abnormal increase of immature white blood cells called "blasts". Leukemia is a broad term covering a spectrum of diseases. In turn, it is part of the even broader group of diseases affecting the blood, bone marrow, and lymphoid system, which are all known as hematological neoplasms. |
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| 395. |
Which one of the following glands in the human body stores iodine? |
| A. | Parathyroid |
| B. | Thyroid |
| C. | Pituitary |
| D. | Adrenal |
| Answer» B. Thyroid | |
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Explanation: Iodine is mostly concentrated in thyroid gland. A healthy adult body contains 15- 20 mg of iodine, 7080% of which is stored in the thyroid gland |
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| 396. |
Which one of the following is related to Silviculture? |
| A. | Culture of Hilsa |
| B. | Culture of silver carp |
| C. | Culture of oil-producing plants |
| D. | Forest crops |
| Answer» D. Forest crops | |
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Explanation: Silviculture is the practice of controlling the establishment, growth, composition, health, and quality of forests to meet diverse needs and values. The name comes from the Latin silver (forest) + culture (as in growing). The study of forests and woods is termed silvology. Forest regeneration is the act of renewing tree cover by establishing youngtrees naturally or artificially, generally promptly after the previous stand or forest has been removed. |
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| 397. |
Which of the following is the sweetest sugar? |
| A. | Sucrose |
| B. | Glucose |
| C. | Fructose |
| D. | Maltose |
| Answer» C. Fructose | |
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Explanation: Sucrose has a relative sweetness of 1.0, while Splenda (Sucralose) of the same quantity is about 600 times sweeter. Fructose is the sweetest of all natural sugar types, with a relative sweetness of 1.73. Xylitol is roughly as sweet as sucrose. Glucose, which is the main component of starch, has a relative sweetness of 0.6-0.7. Of all the sugars, Lactose is the least sweet, with a relative sweetness of 0.16. |
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| 398. |
The H5N1 virus which causes bird flu was first discovered in - |
| A. | 1991 |
| B. | 1995 |
| C. | 1997 |
| D. | 2001 |
| Answer» C. 1997 | |
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Explanation: Influenza A virus subtype H5N1, also known as "bird flu", A(H5N1) or simply H5N1, is a subtype of the influenza A virus which can cause illness in humans and many other animal species. H5N1 isolates found in Hong Kong in 1997 and 2001 were not consistently transmitted efficiently among birds .and did not cause significant disease in these animals. In 2002, new isolates of H5N1 were appearing within the bird population of Hong Kong. These new isolates caused acute disease, including severe neurological dysfunction and death in ducks. This was the first reported case of lethal influenza virus infection in wild aquatic birds since 1961. |
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| 399. |
Denaturation of a protein is caused by – |
| A. | Heat |
| B. | Acid |
| C. | High salt concentration |
| D. | All of the above |
| Answer» D. All of the above | |
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Explanation: Denaturation of proteins involves the disruption and possible destruction of both the secondary and tertiary structures. |
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| 400. |
Which of the following hormone is called emergency hormone? |
| A. | Insulin |
| B. | Adrenaline |
| C. | Oestrogen |
| D. | Oxytocin |
| Answer» B. Adrenaline | |
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Explanation: In this situation, the adrenal medulla secretes extra adrenaline and noradrenaline into the bloodstream. The hormones have important effects on the body. |
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