McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 501. |
Which one of the following has most corrosive effect? |
| A. | Air |
| B. | Carbon dioxide |
| C. | Plants |
| D. | Water |
| Answer» D. Water | |
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Explanation: Common corrosives are either strong acids, strong bases, or concentrated solutions of certain weak acids or weak bases. |
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| 502. |
A plant with compound leaves is - |
| A. | Papaya |
| B. | Coconut |
| C. | Peepal |
| D. | Hibiscus |
| Answer» B. Coconut | |
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Explanation: A compound leaf has a fully subdivided blade, each leaflet of the blade separated along a main or secondary vein. Because each leaflet can appear to be a simple leaf, it is important to recognize where the petiole occurs to identify a compound leaf. Compound leaves are a characteristic of some families of higher plants, such as the Fabaceae. The coconut palm produces a crown of pinnately compound yellow-green leaves called fronds. Each frond reaches 15 to 17 feet in length. |
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| 503. |
The scientist who explained about blood circulation for the first time was - |
| A. | Antonyvan Leewen Hock |
| B. | William Harvey |
| C. | Gregor Mendel |
| D. | Ronald Ross |
| Answer» B. William Harvey | |
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Explanation: William Harvey was an English physician, who described completely and in detail the systemic circulation and properties of blood being pumped to the body by the heart, though earlier writers had provided precursors of the theory. After his death the William Harvey Hospital was constructed in the town of Ashford, several miles from his birthplace of Folkestone. He is not well recognized for his accomplishments in today's society. |
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| 504. |
What are the basic units from which human spare parts can be created? |
| A. | Nerve cells |
| B. | Stern cells |
| C. | Heart cells |
| D. | Kidney cells |
| Answer» B. Stern cells | |
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Explanation: Stem cells are biological cells found in all multicellular organisms, that can divide (through mitosis) and differentiate into diverse specialized cell types and can self-renew to produce more stem cells. Stem cells can now be artificially grown and transformed (differentiated) into specialized cell types with characteristics consistent with cells of various tissues such as muscles or nerves through cell culture. |
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| 505. |
The pollen grains of flowers pollinated by insects are : |
| A. | smooth and dry |
| B. | rough and sticky |
| C. | rough and dry |
| D. | large and, showy |
| Answer» B. rough and sticky | |
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Explanation: Pollen grains are large sticky and heavy, usually with rough surfaces so that they can readily cling onto the insects bodies. They are sticky so that pollen grains settling on them are not easily displaced. |
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| 506. |
Which of the following structures present in mammalian skin directly helps in keeping the body warm? |
| A. | Pigmented cells |
| B. | Sweat glands |
| C. | Lymph vessels |
| D. | Blood capillaries |
| Answer» C. Lymph vessels | |
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Explanation: The lymphatic system consists of a network of specialized lymphatic vessels and various tissues and organs throughout the body that contain lymphocytes (White Blood Cells)and other cells that help the body fight infection and disease. The lymphatic vessels are similar to veins but have thinner walls. Some of these vessels are very close to the skin surface and can be found near veins; others are just under the skin and in the deeper fatty tissues near the muscles and can be found near arteries. |
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| 507. |
Which from the following diseases usually spreads through milk? |
| A. | Tuberculosis |
| B. | Jaundice |
| C. | Diphtheria |
| D. | Cholera |
| Answer» A. Tuberculosis | |
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Explanation: There are two forms of tuberculosis that cause significant disease in mammals. Human tuberculosis, a sometimes acute, but much more commonly, a chronic lung infection is caused by the bacterium, Mycobacterium tuberculosis. Bovine tuberculosis is a very similar disease that infects cattle, as well as deer, goats, elk and many other animals. This infection is caused by a related bacterium, Mycobacterium bovis. |
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| 508. |
Which of the following crops would be preferred for sowing in order to enrich the soil with nitrogen? |
| A. | Wheat |
| B. | Mustard |
| C. | Sunflower |
| D. | Gram |
| Answer» D. Gram | |
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Explanation: Gram flour, also known as garbanzo bean flour, chickpea flour, or besan, is pulse flour made from ground chickpeas. |
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| 509. |
Which among the following has segmented body? |
| A. | Phylum Mollusca. |
| B. | Phylum Arthopoda |
| C. | Phylum Annelida |
| D. | Phylum Coelenterata |
| Answer» C. Phylum Annelida | |
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Explanation: The Annelida, also known as the ringed worms or segmented worms, are a large phylum, with over 17,000 extant species including ragworms, earthworms, and leeches. |
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| 510. |
How many layers does Human Skin have? |
| A. | 5 |
| B. | 7 |
| C. | 11 |
| D. | 3 |
| Answer» D. 3 | |
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Explanation: 0 |
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| 511. |
It causes clotting of blood - |
| A. | Thrombin |
| B. | Haemoglobin |
| C. | Pectin |
| D. | All of the above |
| Answer» A. Thrombin | |
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Explanation: There are two major facets of the clotting mechanism - the platelets, and the thrombin system. The thrombin system consists of several blood proteins that, when bleeding occurs, become activated. The activated clotting proteins engage in a cascade of chemical reactions that finally produce a substance called fibrin. Red blood cells become caught up in the web, and a "red clot" forms. |
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| 512. |
The largest flightless bird which can run at a great speed is - |
| A. | Penguin |
| B. | Kiwi |
| C. | Ostrich |
| D. | Emu |
| Answer» C. Ostrich | |
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Explanation: The Ostrich is the largest living species of bird. They usually weigh from 63 to |
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| 513. |
Ginger is a modified - |
| A. | roof |
| B. | leaf |
| C. | tendril |
| D. | stem |
| Answer» D. stem | |
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Explanation: Technically, ginger is a plant with a specialized stem called a rhizome which is a horizontal underground stem that often sends out roots and shoots from its nodes. These roots can develop into stern tubers for storage or root tubers for asexual reproduction. |
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| 514. |
Honey contains mainly - |
| A. | Proteins |
| B. | Carbohydrates |
| C. | Fat |
| D. | Vitamin |
| Answer» B. Carbohydrates | |
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Explanation: Honey is a mixture of sugars and other compounds. With respect to carbohydrates, honey is mainly fructose (about 38.5%) and glucose (about 31.0%), making it similar to the synthetically produced inverted sugar syrup, which is approximately 48% fructose, 47% glucose, and 5% sucrose. Honey's remaining carbohydrates include maltose, sucrose, and other complex carbohydrate. |
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| 515. |
In a plant, the xylem tissue conducts - |
| A. | water |
| B. | food |
| C. | water and food |
| D. | None of these |
| Answer» A. water | |
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Explanation: Xylem is of a plant's vascular system that conveys water and dissolved minerals from the roots to the rest of the plant and furnishes mechanical support. It constitutes the major part of a mature woody stem or root and the wood of a tree, and consists of specialized water-conducting tissues made up mostly of several types of narrow, elongate, hollow cells. |
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| 516. |
The gas released during photosynthesis: |
| A. | Carbon dioxide |
| B. | Oxygen |
| C. | Carbon monoxide |
| D. | Sulphur dioxide |
| Answer» B. Oxygen | |
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Explanation: In plants, algae, and cyanobacteria, photosynthesis uses carbon dioxide and water, releasing oxygen as a waste product. Photosynthesis is vital for all aerobic life on Earth. In oxygenic photosynthesis water is the electron donor and, since its hydrolysis releases oxygen, the equation for this process is: Carbon dioxide + Water + Light energy --> Carbohydrate + Oxygen + Water |
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| 517. |
The transfer of minerals from top soil to subsoil through soil-water is called? |
| A. | Percolation |
| B. | Conduction |
| C. | Leaching |
| D. | Transpiration |
| Answer» C. Leaching | |
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Explanation: Leaching refers to the loss of water-soluble plant nutrients from the soil, due to rain and irrigation. |
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| 518. |
When you eat Carrot, you are eating: |
| A. | Root |
| B. | Leaf |
| C. | Stem |
| D. | Fruit |
| Answer» A. Root | |
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Explanation: When we eat carrot, we are eating root part of a plant. |
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| 519. |
The floral part that produces pollen grains is - |
| A. | Sepal |
| B. | Petal |
| C. | Anther |
| D. | Ovary |
| Answer» C. Anther | |
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Explanation: Anther is the apical portion of a stamen, which produces the microspores or pollen grains. An anther normally comprises four pollen sacs arranged in two groups or lobes joined by the connective tissue to the filament |
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| 520. |
Which are not included in the milk teeth in a child of 3-4 years? |
| A. | Incisors |
| B. | Canines |
| C. | Molars |
| D. | Premolars |
| Answer» C. Molars | |
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Explanation: Molars are the posterior most and most complicated kind of tooth in most mammals. The third, rearmost molar in each group is called a wisdom tooth. It is the last tooth to appear, breaking through the front of the gum at about the age of twenty. |
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| 521. |
The red colour of human blood is due to |
| A. | myoglobin |
| B. | hemoglobin |
| C. | immunoglobulin |
| D. | haptoglobin |
| Answer» B. hemoglobin | |
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Explanation: Hemoglobin is the iron- containing oxygen-transport metalloprotein in the red blood cells of all vertebrates which carries oxygen from the respiratory organs to the rest of the body. It changes shape when it binds oxygen. When it changes shape, it absorbs different wavelengths of light, making it change color. When blood is exposed to air, much more of the hemoglobin absorbs oxygen than had in the vein the blood' came from. Therefore, the blood turns red. |
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| 522. |
The functional unit of the kidney is - |
| A. | neuron |
| B. | glomerulus |
| C. | nephron |
| D. | ureter |
| Answer» C. nephron | |
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Explanation: Nephron is the basic structural and functional unit of the kidney. Its chief function is to regulate the concentration of water and soluble substances like sodium salts by filtering the blood, reabsorbing what is needed and excreting the rest as urine. A nephron eliminates wastes from the body, regulates blood volume and blood pressure, controls levels of electrolytes and metabolites, and regulates blood pH. |
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| 523. |
Which of the following causes Malaria? |
| A. | Insect |
| B. | Bacteria |
| C. | Protozoa |
| D. | Virus |
| Answer» C. Protozoa | |
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Explanation: Malaria is caused by protozoan of the genus Plasmodium. There are several stages in the life cycle of Plasmodium, including sporozoites, merozoites, and gametocytes. |
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| 524. |
Deposition of uric acid crystals at the joint is the cause of - |
| A. | Arthritis |
| B. | Osteoporosis |
| C. | Osteomalacia |
| D. | Rickets |
| Answer» A. Arthritis | |
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Explanation: Gout is a medical condition usually characterized by recurrent attacks of acute inflammatory arthritis— a red, tender, hot, swollen joint. It is caused by elevated levels of uric acid in the blood. The uric acid crystallizes, and the crystals deposit in joints, tendons, and surrounding tissues. |
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| 525. |
Whichone of the following is an extinct animal? |
| A. | Passenger pigeon |
| B. | Mountain quail |
| C. | Pink-headed duck |
| D. | Ibis |
| Answer» A. Passenger pigeon | |
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Explanation: The Passenger Pigeon or Wild Pigeon is an extinct North American bird. The species lived in enormous migratory flocks until the early 20th century, when hunting and habitat destruction led to its demise. |
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| 526. |
From which one of the following is quinine extracted? |
| A. | Sarpagandha |
| B. | Opium |
| C. | Cinchona |
| D. | Datum |
| Answer» C. Cinchona | |
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Explanation: Quinine, as a component of the bark of the cinchona tree, was used to treat malaria from as early as the 1600s. The bark of trees in this genus is the source of a variety of alkaloids, the most familiar of which is quinine, an antipyretic (anti-fever) agent. |
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| 527. |
The colour change in the Chameleon is due to the presence of - |
| A. | Haemoglobin |
| B. | Chromatophore |
| C. | Chlorophyll |
| D. | Pneumatophore |
| Answer» B. Chromatophore | |
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Explanation: Chameleons have specialized cells, chromatophores, which contain pigments in their cytoplasm, in three layers below their transparent outer skin. Dispersion of the pigment granules in the chrornatophores sets the intensity of each color. When the pigment is equally distributed in a chromatophore, the whole cell is intensively colored. When the pigment is located only in the centre of the cell, the cell appears mainly transparent. |
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| 528. |
The deficiency of iodine leads to - |
| A. | Hyperthyroidism |
| B. | Goitre |
| C. | Midgut |
| D. | Diabetes |
| Answer» B. Goitre | |
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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 and can be associated with a thyroid gland that is functioning properly or not. Worldwide, over 90% cases of goitre are caused by iodine deficiency. |
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| 529. |
Which of the following is biodegradable? |
| A. | Paper |
| B. | D. D. T |
| C. | Aluminium |
| D. | Plastic |
| Answer» A. Paper | |
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Explanation: Paper is organic in nature as it is made from wood and put). So it is bio- degradable and useful in recycling. |
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| 530. |
Blue-green algae are included in the group – |
| A. | Eubacteria |
| B. | Cyanobacteria |
| C. | Protozoa. |
| D. | Fungi |
| Answer» B. Cyanobacteria | |
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Explanation: Cyanobacteria, also known as blue algae, are single celled and belong to the family of Prokaryotes. That means, they do not have a cell nucleus. The ability of cyanobacteria to perform oxygenic photosynthesis is thought to have converted the early reducing atmosphere into an oxidizing one, which dramatically changed the composition of life forms on Earth by stimulating biodiversity and leading to the nearextinction of oxygen-intolerant organisms. |
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| 531. |
Haemoglobin contains the metal - |
| A. | Copper |
| B. | Molybdenum |
| C. | Iron |
| D. | Magnesium |
| Answer» C. Iron | |
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Explanation: Haemoglobin is an iron- containing protein in red blood cells. It contains a haem prosthetic group that has an iron atom at its centre. When the iron is bound to oxygen, the haem group is red in colour (oxyhameoglobin), and when it lacks oxygen (deoxygenated form) it is blue-red. |
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| 532. |
The most abundant enzyme in the living world is - |
| A. | Rubisco |
| B. | Invertase |
| C. | DNAse |
| D. | Zymase |
| Answer» A. Rubisco | |
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Explanation: The abundant enzyme in the living world is Rubisco. It is a key regulator of non-steady state of photosynthesis. |
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| 533. |
Mycobacterium leprae is a - |
| A. | Bacillus |
| B. | Coccus |
| C. | Spiral |
| D. | Spore |
| Answer» A. Bacillus | |
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Explanation: Mycobacterium leprae is a bacillus. |
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| 534. |
An insect is an organism having - |
| A. | 3 pairs of legs |
| B. | 4 pairs of legs |
| C. | Head, thorax and abdomen |
| D. | Pair of wings and antenna |
| Answer» A. 3 pairs of legs | |
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Explanation: An insect is an organism having three pairs of legs. Insects are small, land- dwelling arthropods, characterised by three pairsof jointed legs. It has three distinct body sections: the head, thorax and abdomen. It has one pair of antennae (comprising the scape, pedicel and flagellum), compound eyes and often one or two pairs of wings. |
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| 535. |
Malaria is transmitted from one person to another by: |
| A. | Aedes Mosquito |
| B. | Culex Mosquito |
| C. | Anopheles Mosquito |
| D. | All of the above |
| Answer» C. Anopheles Mosquito | |
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Explanation: Malaria is a mosquito-borne infectious disease which begins with a bite from an infected female Anopheles mosquito, which introduces the protists through saliva into the circulatory system. In the blood, the protists travel to the liver to mature and reproduce. |
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| 536. |
Liver is a RICH source of - |
| A. | sugars |
| B. | fat soluble vitamins |
| C. | minerals |
| D. | proteins |
| Answer» D. proteins | |
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Explanation: In general, liver is a good source of vitamin A, iron, zinc, copper and manganese, and a very good source of protein. There are twenty grams of protein in a single slice of liver. |
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| 537. |
Cuscuta is a - |
| A. | Saprophyte |
| B. | Epiphyte |
| C. | Xerophyte |
| D. | Parasite |
| Answer» D. Parasite | |
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Explanation: Cuseuta (dodder) is a genus of about 100-170 species of yellow, orange, or red parasitic plants. Dodder is parasitic on a very wide variety of plants, including a number of agricultural and horticultural crop species, such as alfalfa, lespedeza, flax, clover, potatoes, etc. |
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| 538. |
The number of eggs normally released during one menstrual cycle is: |
| A. | 3 |
| B. | 2 |
| C. | 1 |
| D. | 4 |
| Answer» D. 4 | |
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Explanation: In each menstrual cycle, rising levels of estrogen cause the ovary develop an egg and release it (ovulation). After ovulation, the egg lives for 24 hours. |
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| 539. |
Vegetables and fruits should be a part of our diet because they stimulate - |
| A. | Peristalsis |
| B. | Salivation |
| C. | Excretion |
| D. | Respiration |
| Answer» A. Peristalsis | |
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Explanation: Vegetable and fruits should be a part of our diet because they stimulate peristalsis. |
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| 540. |
Insectivorous plants grow in soil deficient in - |
| A. | Calcium |
| B. | Nitrogen |
| C. | Magnesium |
| D. | Water |
| Answer» B. Nitrogen | |
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Explanation: Insectivorous plants grow in soil deficient in nitrogen. |
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| 541. |
RBCs do not perform aerobic respiration because these do not contain - |
| A. | Mitochondria |
| B. | Nucleus |
| C. | Endoplasmic Reticulum |
| D. | Lysosomes |
| Answer» A. Mitochondria | |
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Explanation: Red Blood Corpusles (RBCs) do not contain Mitochondria. |
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| 542. |
A cross between homozygous recessive and heterozygous plant is - |
| A. | Back cross |
| B. | Test cross |
| C. | Monohybrid cross |
| D. | Dihybrid cross |
| Answer» B. Test cross | |
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Explanation: A cross between homozygous recessive and heterozygous plant is called Test Cross |
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| 543. |
Which of the following is not a gland? |
| A. | Thyroid |
| B. | Stomach |
| C. | Liver |
| D. | Pancreas |
| Answer» B. Stomach | |
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Explanation: The stomach is a muscular, hollow, dilated part of the digestion system which functions as an important organ of the digestive tract in some animals, including vertebrates. It secretes protein-digesting enzymes called protease and strong acids to aid in food digestion. |
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| 544. |
A person having blood type B could safely donate blood to persons with blood types - |
| A. | A and O |
| B. | B and O |
| C. | A and AB |
| D. | B and AB |
| Answer» D. B and AB | |
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Explanation: If someone belongs to the blood group B, he has B antigens on the surface of his red blood cells and A antibodies in' his blood plasma. So he can donate blood to persons of B and AB blood groups, but cannot receive blood from persons having B or O groups. |
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| 545. |
Which of the following is the parasitic plant? |
| A. | Marchantia |
| B. | Kelp |
| C. | Mushroom |
| D. | Pteris |
| Answer» C. Mushroom | |
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Explanation: A parasitic plant is a plant that derives some or all of its nutritional requirements from another living plant. |
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| 546. |
Cooking oil can be converted into vegetables ghee by the process of – |
| A. | Oxidation |
| B. | Hydrogenation |
| C. | Distillation |
| D. | Crystallization |
| Answer» B. Hydrogenation | |
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Explanation: Hydrogenation is a chemical reaction - widely used in the processing of cooking oils and fats - that turns unsaturated fatty acids into saturated ones. |
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| 547. |
Cellulose is the chief constituent of – |
| A. | cell wall |
| B. | cell membrane |
| C. | secondary wall of xylem |
| D. | body wall of insects |
| Answer» A. cell wall | |
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Explanation: In the primary (growing) plant cell wall, the major carbohydrates are cellulose, hemicellulose and pectin. The cell wall in plants provides the most significant difference between plant cells and other eukaryotic cells. The cell wall is rigid (up to many micrometers in thickness) and gives plant cells a much defined shape. |
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| 548. |
Which one of the following Vitamins helps in maintaining our skin healthy? |
| A. | Vitamin A |
| B. | Vitamin C |
| C. | Vitamin B-12 |
| D. | Vitamin E |
| Answer» D. Vitamin E | |
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Explanation: Vitamin E is a fat-soluble antioxidant that is essential for the maintenance of healthy skin. |
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| 549. |
Which one of the following mixtures is homogeneous? |
| A. | Starch and sugar |
| B. | Methanol and water |
| C. | Graphite and charcoal |
| D. | Calcium carbonate and calcium bicarbonate |
| Answer» B. Methanol and water | |
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Explanation: A homogeneous mixture is a solid, liquid, or gaseous mixture that has the same proportions of its components throughout any given sample. |
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| 550. |
Hypoglycemia refers to – |
| A. | high salt concentration in blood |
| B. | high blood sugar level |
| C. | high blood pressure |
| D. | low sugar level in blood |
| Answer» D. low sugar level in blood | |
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Explanation: Hypoglycemia is an abnormally diminished content of glucose in the blood. The term literally means "low sugar blood". It can produce a variety of symptoms and effects but the principal problems arise from an inadequate supply of glucose to the brain, resulting in impairment of function. |
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