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1660+ Biology (GK) Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .

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1001.

Which of the following provides energy for photosynthesis?

A. Water
B. Sunlight
C. Chlorophyll
D. Carbon dioxide
Answer» B. Sunlight
Explanation: Photosynthesis is a process used by plants and other organisms to convert the light energy captured from the sun into chemical energy that can be used to fuel the organism's activities. The general equation for photosynthesis is therefore: Carbon dioxide +electron donor + light energy -4 carbohydrate + oxidized electron donor.
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1002.

Food for the developing fetus is supplied by the –

A. Uterus
B. Placenta
C. Ovary
D. Allantosis
Answer» B. Placenta
Explanation: The placenta is an organ that connects the developing fetus to the uterine wall to allow nutrient uptake, waste elimination, and has exchange via the mother's blood supply. It allows the transfer of nutrients and oxygen from the mother to the fetus and the transfer of waste products and carbon dioxide back from the fetus to the maternal blood supply. Nutrient transfer to the fetus occurs via both active and passive transport.
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1003.

The saliva helps in the digestion of –

A. Proteins
B. Starch
C. Fibres
D. Fats
Answer» B. Starch
Explanation: Amylase enzymes secreted in saliva help break down starches into simpler sugar molecules that can be absorbed into the bloodstream. In this way, amylase activity influences blood glucose levels, which need to be maintained within an optimal range for good health.
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1004.

Which vitamin deficiency causes the disease, Pernicious anaemia?

A. Vitamin B5
B. Vitamin B12
C. Vitamin B6
D. Vitamin C
Answer» B. Vitamin B12
Explanation: Pernicious anemia is one of many types of the larger family of megaloblasticanemias. It is caused by loss of gastric parietal cells which are responsible, in part, for the secretion of intrinsic factor, a protein essential for subsequent absorption of vitamin B12 in the ileum.
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1005.

'Pigeon milk' is produced by –

A. Crop
B. Birds
C. Mammals
D. All of the above
Answer» B. Birds
Explanation: Crop milk is a secretion from the lining of the crop of parent birds that is regurgitated to young birds. They are found among all pigeons and doves where they are referred to as pigeon milk. Crop milk is also produced by flamingos and some penguins. Crop milk bears little resemblance to mammalian milk, being a semi-solid substance somewhat like pale yellow cottage cheese.
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1006.

Which of the following cytoplasmic organelles are treated as prokaryotic cells within the eukaryotic cells?

A. Mitochondria
B. Golgi bodies
C. Lysosomes
D. Glyoxysomes
Answer» A. Mitochondria
Explanation: Mitochondria are semi- autonomous organelles that likely began as freestanding prokaryotes that invaded eukaryotic cells more than a billion years ago. A symbiotic relationship eventually developed between these prokaryotic cells and their eukaryotic hosts. The former prokaryotes lost the capacity for independent existence but became indispensible to the eukaryotic cells.
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1007.

Nitrogenous food is

A. Carbohydrate
B. Lipid
C. Protein
D. Salts
Answer» C. Protein
Explanation: All proteins contain nitrogen. Precisely, they contain about 16 per cent nitrogen. The determination of protein requirement is based,on nitrogen balance, which include total nitrogen in food and excreta.
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1008.

The pigment which gives colour to the human skin is –

A. Melanin
B. Rhodopsin
C. Iodopsin
D. Anthocyanin
Answer» A. Melanin
Explanation: Human skin color is primarily due to the presence of melanin in the skin. Skin color ranges from almost black to white with a pinkish tinge due to blood vessels underneath. In animals melanin pigments are derivatives of the amino acid tyrosine.
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1009.

Which of the following diseases is spread through contaminated food?

A. Malaria
B. Tetanus
C. Typhoid
D. Mumps
Answer» C. Typhoid
Explanation: Typhoid fever is a disease that is caused by the bacteria Salmonella Typhi. Most people get typhoid fever by eating or drinking food or water that has been contaminated by people with the disease, including by those who do not have any symptoms. Person-to-person spread can also occur.
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1010.

Prawns belong to which family?

A. Crustaceans
B. Fish
C. Amphibians
D. Reptiles
Answer» A. Crustaceans
Explanation: Prawn is a common name for small aquatic crustaceans with an exoskeleton and tenlegs. Prawns are also known as shrimps.
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1011.

Number of the pairs of the spinal nerves are:

A. 30
B. 31
C. 33
D. 32
Answer» B. 31
Explanation: Spinal nerve. Spinal nerve, in vertebrates, any one of many paired peripheral nerves that arise from the spinal cord. In humans there are 31 pairs: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal. Each pair connects the spinal cord with a specific region of the body.
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1012.

How many times does the heart beat approximately in a minute in humans?

A. 25 times
B. 30 times
C. 72 times
D. 96 times
Answer» C. 72 times
Explanation: The average heart rate for adult humans is about 70 to 75 beats per minute in a normal relaxed mode. The "normal" heart beat rate is taken to be "72 beats per minute".
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1013.

Protein is considered as a -

A. Body builder
B. Energy producer
C. Regulator
D. Bulk increaser
Answer» A. Body builder
Explanation: Protein is required by the body for the growth, maintenance and repair of allcells. Protein is a major component of all muscles, tissues and organs and is vital for practically every process that occurs within the body such as metabolism, digestion and the transportation of nutrients and oxygen in the blood. When the proteins that we consume in our food are broken down through digestion into individual amino acids, these amino acids are then absorbed and reform in order to create new proteins that are then used by the body.
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1014.

Polio disease is caused by -

A. Bacteria
B. Fungi
C. Virus
D. Worm
Answer» C. Virus
Explanation: Polio, or poliomyelitis, is a crippling and potentially deadly infectious disease. It is caused by the poliovirus.
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1015.

Blood pressure is controlled by –

A. Adrenal gland
B. Thyroid gland
C. Thymus
D. Corpus luteum
Answer» A. Adrenal gland
Explanation: Adrenaline directly affects, regulates and determines the body's ability to
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1016.

Which of the following is called the powerhouse' of the cell?

A. Nucleus
B. Lysosome
C. Chromosome
D. Mitochondrion
Answer» D. Mitochondrion
Explanation: Mitochondria are sometimes described as "cellular power plants" because they generate most of the cell's supply of adenosine tri-phosphate (ATP), used as a source of chemical energy. In addition to supplying cellular energy, mitochondria are involved in other tasks such as signaling, cellular differentiation, cell death, as well as the control of the cell cycle and cell growth.
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1017.

Acquired Immuno Deficiency Syndrome (AIDS) is caused by –

A. protozoa
B. virus
C. fungus
D. bacteria
Answer» B. virus
Explanation: Human immunodeficiency virus infection/acquired immunodeficiency syndrome (HIV/AIDS) is a disease of the human immune system caused by the human immunodeficiency virus (HIV).
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1018.

The function of Trypsin is to –

A. break down fats
B. synthesize proteins
C. break down proteins
D. break down carbohydrates
Answer» C. break down proteins
Explanation: Trypsin is a serine protease found in the, digestive system of many vertebrates, where it hydrolyses proteins. Trypsin isproduced in the pancreas. Trypsin cleaves peptide chains mainly at the carboxyl side of the amino acids lysine or arginine, except when either is followed by praline. It is used for numerous biotechnological processes.
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1019.

Mesothelioma is a type of cancer. The most common area affected in it is the lining of the –

A. heart
B. brain
C. stomach
D. lungs
Answer» D. lungs
Explanation: Mesothelioma is a type of cancer that develops from the thin layer of tissue that covers many of the internal organs (known as the mesothelium).
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1020.

How do most insects respire?

A. Through skin
B. Through gills
C. By tracheal system
D. By lungs
Answer» C. By tracheal system
Explanation: Insects do not have lungs to do respiration. In insects respiration takes place through tracheae. Tracheae are tube like structures that open on the sides of their body through tiny holes called spiracles.
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1021.

Which of the following is the best source of Iodine?

A. Algae
B. Beans
C. Radish
D. Wheat
Answer» B. Beans
Explanation: Iodine exists in soil, but the content may vary because soil erosion can leach away this and other minerals. Beans and seeds highest in iodine content include lima beans, soybeans, cooked navy beans and sesame seeds. Vegetables highest in iodine include spinach,*Swiss chard, turnip greens, summer squash and white potatoes with the peel. The herb highest in iodine is garlic.
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1022.

Transport of oxygen by blood takes place with the help of

A. Erythrocytes
B. Thrombocytes
C. Lymphocytes
D. Leuecocytes
Answer» A. Erythrocytes
Explanation: Red blood cells, or erythrocytes, are the most common type of blood cell and the vertebrate organism's principal means of delivering oxygen (O2) to the body tissues via the blood flow through the circulatory system. The cytoplasm of these cells is rich in haemoglobin., an iron-containing bio-molecule that can bind oxygen and is responsible for the blood's red color.
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1023.

Butter is -

A. fat dispei-sed in milk
B. water dispersed in fat
C. water dispersed in oil
D. fat dispersed in water
Answer» B. water dispersed in fat
Explanation: Butter is an emulsion of water in milk fat. The water constitutes the dispersed phase and the milk fat the continuous phase. As well as fat and water, butter products and dairy spread products contain a range of other milk compounds such as protein, lactose, minerals, vitamins, fat-accompanying substances and, in soured butter, microbially formed metabolites such as lactic acid and aromatic substances.
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1024.

The part of the flower that can carry out photosynthesis is –

A. Androecium
B. Gynoecium
C. Calyx
D. Corolla
Answer» C. Calyx
Explanation: A flower has calyx, corolla, androecium and gynoecium. Calms and corolla are accessory organs, while androecium and gynoecium are reproductive organs. Photosynthetic activity is found in the calyx, green shoulder, pericarp, and locular parenchyma. It suggests that all of these tissues have significant roles in CO2 scavenging and the provision of carbon assimilates.
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1025.

"Pace-maker" is associated with –

A. Kidney
B. Brain
C. Heart
D. Lung
Answer» C. Heart
Explanation: A pacemaker is a medical device that uses electrical impulses, delivered by electrodes contacting the heart muscles, to initiate and regulate the beating of the heart. The primary purpose of a pacemaker is to maintain an adequate heart rate.
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1026.

Insufficient dietary iodine can cause –

A. Cretinism
B. Giant build
C. Enlarged thyroid
D. Small thyroid
Answer» C. Enlarged thyroid
Explanation: A severe iodine deficiency can cause hypothyroidism, and even developmental brain disorders and severe goiter. If there is not enough iodine in the diet, the thyroid will be unable to produce enough hormone. Thus, insufficient dietary iodine can cause the thyroid to grow unnaturally, due to the pituitary's continued high production of TSH in its attempt to raise thyroid hormone levels.
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1027.

What determines the sex of a child?

A. Chromosomes of the father
B. Chromosomes of the mother
C. Rh factor of the parents
D. Blood group of the father
Answer» A. Chromosomes of the father
Explanation: In humans and several other species of animals, the father determines the sex of the child. In the XV sex-determination system, the female-provided ovum contributes an X chromosome and the maleprovided sperm contributes either an X chromosome or a Y chromosome, resulting in female (XX) or male (XY) offspring, respectively.
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1028.

In a freezer ice cubes will be formed more quickly in trays made of –

A. rubber
B. plastic
C. aluminium
D. wood
Answer» C. aluminium
Explanation: Aluminium being a good conductor of heat conducts away the heat from the substance quite easily and causes quick freezing.
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1029.

Carrot is a rich source of vitamin –

A. A
B. C
C. D
D. E
Answer» A. A
Explanation: Carrot is an extremely rich source of vitamin A. The name carotene, which is a form of pro-vitamin, has been derived from carrot. The carotene is converted into vitamin A by the liver and it is also stored in our body.
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1030.

Which one of the following is used as a food preservative?

A. Sodium benzoate
B. Sodium thiosulphate
C. Sodium hydroxide
D. Sodium bicarbonate
Answer» A. Sodium benzoate
Explanation: Sodium benzoate has the chemical formula. NaC6H5CO2, it is a widely used food preservative, with E number E211. It is the sodium salt of benzoic acid and exists in this form when dissolved in water. It can be produced by reacting sodium hydroxide with benzoic acid.
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1031.

Which of the following organelle of the cell contain their own genetic material?

A. Mitochondria
B. Ribosomes
C. Golgi complex
D. None of the above
Answer» A. Mitochondria
Explanation: Nucleus is the central organelle of the cell which encloses the DNA. Apart from the nucleus, there are few other organelles which have their own DNA.
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1032.

The disease Beri Beri is caused due to the deficiency of which of the following?

A. Vitamin B2
B. Vitamin B1
C. Vitamin B12
D. Vitamin E
Answer» B. Vitamin B1
Explanation: Beriberi is a disease caused by a vitamin B1 (thiamine) deficiency. There are two types of the disease: wet beriberi and dry beriberi.
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1033.

Which is the largest blood vessel, in human body?

A. Aorta
B. Anatomises
C. Tunica Intima
D. Atrium
Answer» A. Aorta
Explanation: Aorta is the largest blood vessel in human body. It is the largest of the systemic circulation arteries, Blood enters the aorta from the left ventricle of the heart by way of a one- way valve to prevent backflow. From the aorta, several arterial branches carry oxygenated blood to all tissues in the body.
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1034.

The blotting technique used to identify the isolated protein is -

A. Northern blotting
B. Western blotting
C. Southern blotting
D. Cloning
Answer» B. Western blotting
Explanation: Protein electrophoresis and Western blotting are both methods used to identify specific proteins in a sample or solution. Western blotting, also known as immunoblotting or protein blotting, is a core technique in cell and molecular biology. In most basic terms, it is used to detect the presence of a specific protein in a complex mixture extracted from cells.
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1035.

Morphology of Chromosomes can be best studied at -

A. Interphase
B. Prophase
C. Metaphase
D. Zygotene
Answer» C. Metaphase
Explanation: The morphology of the chromosomes can be distinctly studied at metaphase stage of cell division because at this stage chromosomes are in highly condensed state and become thicker and well arranged. The following structures are observed in a typical chromosome: Chromatid, Chrornonemata, Primary constriction (centromere), Secondary constriction (nucleolar organizer), satellite, telomere, and chromosmere.
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1036.

Which of the following is a fish?

A. Jelly fish
B. Lobster
C. Salmon
D. Whale
Answer» C. Salmon
Explanation: Salmon is the common name for several species of rayfinned fish in the family Salmonidae. Other fish in the same family include trout, char, grayling and whitefish. Salmon are native to tributaries of the North Atlantic and Pacific Ocean.
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1037.

The vitamin which cannot be had from any vegetables is –

A. Vitamin B
B. Vitamin C
C. Vitamin D
D. Vitamin E
Answer» C. Vitamin D
Explanation: In humans, vitamin D is unique because the body can synthesize it (from cholesterol) when sun exposure is adequate (hence its nickname, the "sunshine vitamin").Very few foods in nature contain vitamin D. The flesh of fatty fish (such as salmon, tuna, and mackerel) and fish liver oils are among the best sources.
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1038.

The concept of ‘survival of the fittest’ was first advocated by -

A. Oparin
B. Darwin
C. Spencer
D. Haeckel
Answer» B. Darwin
Explanation: "Survival of the fittest" is a phrase originating in evolutionary theory, as an alternative description of natural selection. The phrase is today commonly used in contexts that are incompatible with the original meaning as intended by its first two proponents: British polymath philosopher Herbert Spencer (who coined the term) and Charles Darwin. Herbert Spencer first used the phrase - after reading Charles Darwin's On the Origin of Species - in his Principles of Biology (1864), in which he drew parallels between his own economic theories and Darwin's biological ones.
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1039.

Deficiency of vitamin D in children causes -

A. beriberi
B. pellagra
C. rickets
D. scurvy
Answer» C. rickets
Explanation: Rickets is a softening of bones in children due to deficiency or impaired metabolism of vitamin D, phosphorus or calcium, potentially leading to fractures and deformity. Rickets is among the most frequent childhood diseases in many developing Countries. The predominant cause is a vitamin D deficiency, but lack of adequate calcium in the diet may also lead to rickets (cases of severe diarrhea and vomiting may be the cause of the deficiency). Although it can occur in adults, the majority of cases occur in children suffering from severe malnutrition, usually resulting from famine or starvation during the early stages of childhood.
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1040.

Wings of birds are:

A. Modified hind limbs
B. New structure
C. Integumentary outgrowth
D. Modified fore limbs
Answer» D. Modified fore limbs
Explanation: The wings are modified forelimbs of birds which are the key to bird flight. Each wing composed of three limb bones, the humerus, ulna and radius.
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1041.

Radioactive materials should be kept in the container made of :

A. Fe
B. Al
C. Pb
D. Steel
Answer» D. Steel
Explanation: Radioactive materials are first encased in resin or concrete and sealed in steel drums. The drums are then packed into concrete casks and placed in concrete trenches up to 18 metres deep.
discuss
1042.

Which of the following prevents bleeding of gums?

A. Ascorbic acid
B. Vitamin B
C. Nicothaamide
D. Thiamine
Answer» A. Ascorbic acid
Explanation: Vitamin C (Ascorbic acid) cures scurvy, which can cause abnormal gum bleeding. Excellent sources include citrus fruits such as oranges, lemons, limes, and grapefruits.
discuss
1043.

Cell becomes turgid because of -

A. Plasmolysis
B. Exosmosis
C. Endosmosis
D. Diffusion
Answer» C. Endosmosis
Explanation: When the plant cell is placed in a hypotonic solution, it takes up water by osmosis and starts to swell, but the cell wall prevents it from bursting. The plant cell is said to have become "turgid" i.e. swollen and hard. So it is because of endosmosis that cell becomes turgid.
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1044.

The process of imbibitions involves -

A. Diffusion
B. Capillary action
C. Absorption
D. Both (1) and (2)
Answer» C. Absorption
Explanation: The uptake or absorption of water by the solid substance without forming a solution is called imbibition. The substances absorbing water are called imbibants which do not dissolve in water. It is the initial step in the germination of the seeds.
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1045.

'Barr body' is found in -

A. Sperm
B. Sertoli cells
C. Female somatic cells
D. Male somatic cells
Answer» C. Female somatic cells
Explanation: A Barr body is the inactive X chromosome in a female somatic cell in those species in which sex is determined by the presence of the Y or W chromosome rather than the diploidy of the X or Z. A typical human female has only one Barr body per somatic cell, while a typical human male has none.
discuss
1046.

One of the best solutions to get rid of non-biodegradable wastes is -

A. Burning
B. Dumping
C. Burying
D. Recycling
Answer» D. Recycling
Explanation: The best way of getting rid of non-biodegradable waste such as plastic is by recycling them. Burning may release toxic gas into the atmosphere. Burying and dumping will hardly solve anything.
discuss
1047.

Fist is a first class protein as it Contains -

A. essential amino acids
B. non-essential amino acids
C. all essential fatty acids
D. no amino acid
Answer» A. essential amino acids
Explanation: Animal proteins derived from meat and fish are called first class proteins. A first-class protein is one which contains all 8 essential amino acids (which cannot be made by the body). They are also called complete proteins. Plant proteins are called second class proteins.
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1048.

Stern is usually -

A. Positively Phototropic
B. Negatively Phototropic
C. Negatively geotropic
D. Positively acrotropic
Answer» A. Positively Phototropic
Explanation: Tropism is a growth movement whose direction is determined by the direction from which the stimulus strikes the plant. Most stems are positively phototropic, while most roots are said to be negatively phototropic.
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1049.

The cells which are closely associated and interacting with guard cells are -

A. Transfusion tissue
B. Complementary cells
C. Subsidiary cells
D. Hypodermal cells
Answer» C. Subsidiary cells
Explanation: Guard cells interact physiologically and mechanically with subsidiary cells. Guard cells are those which have chloroplasts and control the opening of stomata. But, subsidiary cells are those which support the guard cells and they do not have chloroplasts.
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1050.

Conversion of starch to sugar is essential for -

A. Stomatal opening
B. Stomatal closing
C. Stomatal formation
D. Stomatal growth
Answer» A. Stomatal opening
Explanation: For keeping the stomata open a constant expenditure of energy is required. This is provided by the conversion of starch to sugar. The stomata! opening is, in turn, related to transpiration which is the evaporation of water from plants. It occurs chiefly at the leaves while their stomata are open for the passage of CO2 and 02 during photosynthesis.
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