500+ Biology Objective Questions and Answers


Biology Objective Questions

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Read Also- Biological Classification of Organisms

1. Which of the following is not a mammal?

A. Whale

B. Fish

C. Bat

D. None of these

Click for Answer/Explanation

The correct answer is B ‘Fish’.  The marine creatures like whales, dolphins, and porpoises are mammals.

2. The largest living Mammalia is?

A. Giraffe

B. Blue Whale

C. Camel

D. Human Beings

Click for Answer/Explanation

The correct answer is B. The marine creatures like whales, dolphins, and porpoises are mammals.

3. Which of the following has the smallest living cell?

A. Bacterium

B. Mycoplasma

C. Virus

D. Bread mold

Click for Answer/Explanation

The correct answer is D

4. How many bones are found in the human skull?

A. 8

B. 16

C. 18

D. 19

Click for Answer/Explanation

The correct Answer is A

Also Read these-

 

5. The dinosaurs were –

A. Mesozoic Aves

B. Mesozoic Reptiles

C. Cenozoic Reptile

D. Paleozoic Amphibian

Click for Answer/Explanation

Correct Answer is B

6. Turpentine is obtained from –

A. Pine

B. Crude Petroleum

C. Deodar

D. Oak

Click for Answer/Explanation

Correct Answer is A

7. Which of the following enzymes is found in the saliva?

A. Renin

B. Tenin

C. Tylene

D. Resin

Click for Answer/Explanation

Correct Answer is C

8. Which of the following is not a digestive enzyme?

A. Pepsin

B. Renin

C. Amelepsin

D. Insulin

Click for Answer/Explanation

Correct Answer is D

9. The longest bone of the human body is –

A. Fibula

B. Stapes

C. Femur

D. Tibia

Click for Answer/Explanation

Correct Answer is C

  • It is the thigh bone
  • Stapes is the smallest bone

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10. The bones of the leg in the human body are –

A. Humerus

B. Solid

C. Hollow

D. None of these

Click for Answer/Explanation

The correct answer is C

11. The teeth which develop 2 times in the life cycle of human beings are –

A. 4

B. 12

C. 15

D. 20

Click for Answer/Explanation

The correct answer is D

12. The tissue that plays a significant role in the growth of almost all bones –

A. Areolar Tissue

B. Cartilage

C. Fibroblastic Tissue

D. Spongy Bone

Click for Answer/Explanation

The correct answer is B

13. The bile is accumulated in –

A. Liver

B. Spleen

C. Bile Duct

D. Receptor

Click for Answer/Explanation

The correct answer is C

14. The bile is produced through –

A. Liver

B. Stomach

C. Small Intestine

D. Large Intestine

Click for Answer/Explanation

The correct Answer is A

15. The function of a pacemaker is –

A. to regulate the urine formation

B. to regulate digestion

C. to start respiration

D. to start heartbeat

Click for Answer/Explanation

Correct Answer is D

16. Which one of the following nutrients is a structural component of the cell wall of plants?

A. Mn

B. K

C. Ca

D. P

Click for Answer/Explanation

Correct Answer is C

17. The Cell Sap is –

A. a dilute solution of minerals and some organic substances in the vacuole

B. a dilute solution of minerals in water absorbed by the plant from the soil

C. a solution of different organic substances dissolved in the cytoplasm

D. exudate from the cell

Click for Answer/Explanation

Correct Answer is A

18. The widely used antibiotic penicillin is produced by –

A. An Algae

B. A bacterium

C. A fungus

D. None of these

Click for Answer/Explanation

Correct Answer is C

19. Which of the following is not a micronutrient for a plant?

A. Mg

B. Mn

C. Fe

D. Mo

Click for Answer/Explanation

Correct Answer is C

20. Which of the following is the product of the dark reaction of photosynthesis?

A. ATP

B. Sugar

C. NADH2

D. NADPH2

Click for Answer/Explanation

Correct Answer is B

Also Read- Amazing Facts of Human Body

21. Which of the following sugars are the components of sugarcane?

A. Glucose and Mannose

B. Glucose and Galactose

C. Glucose and Fructose

D. Glucose and Ribose

Click for Answer/Explanation

Correct Answer is C

22. Grey matter consists of –

A. a large number of neurons

B. Neuroglia

C. a large number of nerve cell bodies

D. a large number of nerve fibers

Click for Answer/Explanation

Correct Answer is C

23. The color of cow’s milk is slightly yellowish due to the presence of –

A. Riboflavin

B. Ribulose

C. Carotin

D. Xanthophyll

Click for Answer/Explanation

Correct Answer is A

24. In termites, the cellulose of wood is digested by –

A. Bacteria

B. Protozoans

C. Bacteria and Protozoans

D. Cellulose breaking enzyme ß amylase

Click for Answer/Explanation

Correct Answer is B

25. A solution of chlorophyll pigments looks red in the reflected light because of –

A. Reflection

B. Fluorescence

C. Refraction

D. None

Click for Answer/Explanation

Correct Answer is B

26. The center of cellular and molecular biology is located at –

A. New Delhi

B. Chennai

C. Hyderabad

D. Lucknow

Click for Answer/Explanation

Correct Answer is C

27. The center for DNA fingerprint and diagnostic is located at –

A. Bangalore

B. Hyderabad

C. Chennai

D. New Delhi

Click for Answer/Explanation

Correct Answer is B

28. The theory of mutation was propounded by –

A. Malthus

B. Lamarck

C. Hugo de Vries

D. Hassle

Click for Answer/Explanation

Correct Answer is C

29. The DNA was firstly synthesized by –

A. Kelvin

B. Miller

C. Hargobind Khurrana

D. Hugo de Vries

Click for Answer/Explanation

Correct Answer is C

30. The word gene was firstly used by –

A. Johnson

B. Watson

C. Walder

D. Crick

Click for Answer/Explanation

Correct Answer is A

31. Which among the following is not a true fruit?

A. Grape

B. Date

C. Apple

D. Plum

Click for Answer/Explanation

Correct Answer is D

32. Which of the following has maximum protein?

A. Soybean

B. Pea

C. Gram

D. Pigeon Pea

Click for Answer/Explanation

Correct Answer is A

33. The thickest human skin is of –

A. Palm

B. Sole

C. Head

D. Neck

Click for Answer/Explanation

Correct Answer is B

34. The father of modern antiseptic surgery is –

A. Joseph Lister

B. William Harbor

C. Albert Jenner

D. Louis Pasteur

Click for Answer/Explanation

Correct Answer is A

35. Who gave the double-helix model of DNA?

A. Watson and Crick

B. Dalton

C. Shalk

D. Leeuwenhoek

Click for Answer/Explanation

Correct Answer is A

36. Which of the following occurs in Haemophilia?

A. Hemolysis

B. RBC Sticks

C. WBC becomes cellular trophic

D. blood doesn’t clot

Click for Answer/Explanation

Correct Answer is D

37. Which one of the following is a major source of sugar?

A. Sugarcane

B. Beetroot

C. Date

D. Watermelon

Click for Answer/Explanation

Correct Answer is A

38. The study of Dendrology is associated with –

A. Plants

B. Shrubs

C. Trees

D. Flowers

Click for Answer/Explanation

Correct Answer is B

39. The study of Annual rings is known as –

A. Horticulture

B. Agronomy

C. Dendrology

D. Dendrochronology

Click for Answer/Explanation

Correct Answer is D

40. The study of flowers is called –

A. Horticulture

B. Phenology

C. Anthology

D. Poloinology

Click for Answer/Explanation

Correct Answer is C

41. The study of fruits is called –

A. Spermology

B. Pedology

C. Pomology

D. Anthology

Click for Answer/Explanation

Correct Answer is C

42. Hydrophobia is caused by –

A. Bacteria

B. Fungi

C. Protozoa

D. Virus

Click for Answer/Explanation

Correct Answer is D

43. The environment is a composite state of –

A. Biotic factors

B. Abiotic factors

C. Physiographic factors

D. All the above

Click for Answer/Explanation

Correct Answer is D

44. Food poisoning is caused by –

A. Salmonella Toyphosis

B. Basils Anthresis

C. Clostridium botulinum

D. Clostrdeam atiteni

Click for Answer/Explanation

Correct Answer is C

45. The disease of foot and mouth in the animals are caused by –

A. Bacteria

B. Virus

C. Fungi

D. Protozoa

Click for Answer/Explanation

Correct Answer is D

46. Which of these is the smallest bone in a human body?

A. Staps

B. Femur

C. Nail

D. Bone of Jaw

Click for Answer/Explanation

Correct Answer is A

47. The branch of botany under which fungi are studied is called –

A. Microbiology

B. Mycology

C. Phycology

D. Embryology

Click for Answer/Explanation

Correct Answer is B

48. Which one of the following organs breaks fats to produce cholesterol?

A. Liver

B. Kidneys

C. Intestine

D. Lungs

Click for Answer/Explanation

Correct Answer is A

49. The lichen is an indicator of –

A. Air Pollution

B. Water Pollution

C. Soil Pollution

D. Radiation Pollution

Click for Answer/Explanation

Correct Answer is A

50. The cell wall of Algae is made up of –

A. Cellulose

B. Chitin

C. Suberin

D. Cutin

Click for Answer/Explanation

The correct Answer is A

51. Water percentage in plasma is –

A. 90

B. 60

C. 75

D. 80

Click for Answer/Explanation

Correct Answer is A

52. What is a fever?

A. Pain

B. Inflammation of Skin

C. Inflammation of blood cells

D. Inflammation of blood platelets

Click for Answer/Explanation

Correct Answer is C

53. The hormone insulin is a –

A. Glycolipid

B. Fatty Acid

C. Peptide

D. Sterile

Click for Answer/Explanation

Correct Answer is A

54. The ginger is a –

A. Bulb

B. Rhizome

C. Tuber

D. Modified Root

Click for Answer/Explanation

Correct Answer is B

55. The anti-malaria drug Quinine is made from which plant?

A. Neem

B. Cinchona

C. Cinnamon

D. Eucalyptus

Click for Answer/Explanation

Correct Answer is B

56. The most stable ecosystem is –

A. Forest

B. Steppe

C. Sea

D. Desert

Click for Answer/Explanation

Correct Answer is C

57. From where oxygen is made available for photosynthesis to plants?

A. Air

B. Water

C. Soil

D. Sunlight

Click for Answer/Explanation

Correct Answer is B

58. Which one of the following produces seeds but not flowers?

A. Pine

B. Cashew Nuts

C. Coffee

D. Groundnut

Click for Answer/Explanation

Correct Answer is C

59. The word Histology was firstly used by –

A. Shelden

B. Robert Hooke

C. Mayer

D. T. H. Maman

Click for Answer/Explanation

Correct Answer is C

60. Which of the following vitamins are used as a hormone?

A. Vitamin A

B. Vitamin B

C. Vitamin C

D. Vitamin D

Click for Answer/Explanation

Correct Answer is D

61. Which of the following plant organ is most vital from its life cycle point of view?

A. Root

B. Stem

C. Leaf

D. Flower

Click for Answer/Explanation

Correct Answer is D

62. Sandalwood tree is considered a –

A. total root parasite

B. stem parasite

C. total stem parasite

D. None of these

Click for Answer/Explanation

Correct Answer is A

63. Which component of the plant receives stimulus for flowering?

A. Roots

B. Stems

C. Leaves

D. Branches

Click for Answer/Explanation

Correct Answer is C

64. Genetics deals with –

A. Heredity and Variations

B. Organic Evolution

C. Mendel’s Laws

D. DNA Structure

Click for Answer/Explanation

Correct Answer is A

65. An embryo is found in?

A. Buds

B. Seeds

C. Leaves

D. Flowers

Click for Answer/Explanation

Correct Answer is A

66. In an emergency blood type B can donate blood to a person with blood type?

A. A or B

B. AB or A

C. A or O

D. AB or B

Click for Answer/Explanation

Correct Answer is D

67. The edible part of a potato is –

A. Root

B. Stem

C. Fruit

D. Bud

Click for Answer/Explanation

Correct Answer is B

68. The edible part of cauliflower is?

A. Fruit

B. Bud

C. Thalamus

D. Flower

Click for Answer/Explanation

Correct Answer is C

69. The metallic ion found in the chlorophyll (chloroplast) is?

A. Magnesium

B. Cobalt

C. Iron

D. Zinc

Click for Answer/Explanation

Correct Answer is A

70. Where does the evaporation process occur?

A. Root

B. Stem

C. Leaf

D. The entire body of the plant

Click for Answer/Explanation

Correct Answer is C

71. Which of the following is a man-made paddy?

A. Tritkel

B. Tritium Bulgear

C. Zia mez

D. Hordeum Bulgear

Click for Answer/Explanation

Correct Answer is A

72. The plants which grow on saline soils are called?

A. Halophytes

B. Succulents

C. Hydrophytes

D. Xerophytes

Click for Answer/Explanation

Correct Answer is B

73. The opium is extracted from which part of the plant?

A. Root

B. Stem

C. Leaf

D. Flower

Click for Answer/Explanation

Correct Answer is D

74. Which of the following hormones contains Iodine?

  1. Thyroxine
  2. Testosterone
  3. Insulin
  4. Adrenaline
Click for Answer/Explanation

Answer- (1)

The major component of thyroxin hormone is iodine. The deficiency of Iodine causes goiter.

75. The major chemical compound found in kidney stones is:

  1. Urea
  2. Calcium carbonate
  3. Calcium oxalate
  4. Calcium Sulphate
Click for Answer/Explanation

Answer – (3)

Calcium oxalate is 80% of kidney stone, uric acid is 5%, Magnesium and ammonium phosphate 13% and amino acid cysteine is 2%.

76. Which of the following elements are present in all proteins?

  1. Carbon
  2. Hydrogen
  3. Oxygen
  4. Nitrogen
  5. All of these
Click for Answer/Explanation

Answer – (5)

Protein is a complex organic compound of Carbon, Hydrogen, Oxygen, and nitrogen. It is a long-chain molecule composed of Amino acids joined by peptide bonds.

77. In the eye donation which part of the eye is transplanted from the donor?

  1. Cornea
  2. Lens
  3. Retina
  4. The whole eye
Click for Answer/Explanation

Answer – (1)

The cornea is a transparent, dome-shaped surface of the eye that accounts for a large part of the eye’s focusing power. A cornea transplant can restore vision, reduce pain, and improved the appearance of a damaged or diseased cornea.

78.  Production of which of the following is the function of the liver-

  1. Lipase
  2. Urea
  3. Mucus
  4. HCL
Click for Answer/Explanation

Answer – (2)

Urea is the main nitrogenous excretory product of Ureotelic animals, produced from liver cells from the de-aminated excess of amino acids via the urea cycle.

79. What is the pH value of the blood of a normal person?

  1. 4.5-4.6
  2. 6.45-6.55
  3. 7.35-7.45
  4. 8.25-8.35
Click for Answer/Explanation

Answer – (3)

Blood is slightly alkaline.

80. Among the following which one is not an ape?

  1. Gibbon
  2. Gorilla
  3. Langur
  4. Orangutan
Click for Answer/Explanation

Answer – (3)

It is not an ape but a prosimian.

81. How do most insects respire?

  1. Through skin
  2. Through gills
  3. By Lungs
  4. By tracheal system
Click for Answer/Explanation

Answer – (4)

It lies on a network of small tubes that channel O2 directly to the different parts of the body.

82. Which of the following is not a digestive enzyme in the human system?

  1. Trypsin
  2. Gastrin
  3. Ptyalin
  4. Pepsin
Click for Answer/Explanation

Answer – (2)

Gastrin is a hormone that stimulates the secretion of the digestive enzyme in the stomach.

83. The release of which one of the following into ponds and wells helps in controlling the mosquitoes?

  1. Crab
  2. Dogfish
  3. Gambusia fish
  4. Snail
Click for Answer/Explanation

Answer – (3)

Gambusia affinis is larvivorous, which controls the mosquitoes by eating mosquito larvae, insects and crustaceans.

84. Which among the following is not a good source of nutritional calcium?

  1. Rice
  2. Ragi
  3. Skimmed Milk
  4. Egg
Click for Answer/Explanation

Answer – (2)

85. Which one of the following is a membrane that protects the developing embryo from desiccation?

  1. Amnion
  2. Chorion
  3. Allantois
  4. Yolk sac
Click for Answer/Explanation

Answer – (1)

Amnion is formed above the embryo. It is protected by a fluid-filled space called the amniotic cavity.

86. The normal temperature of a human on the Kelvin scale is-

  1. 273
  2. 290
  3. 300
  4. 310
Click for Answer/Explanation

Answer – (4)

In degree Celsius, it is 37 °C, so when converted to kelvin it becomes 310 i.e. 273 K+37 °C =  310 K

87. Fruits stored in a cold chamber exhibit longer storage life because-

  1. Exposure to sunlight is prevented
  2. The rate of respiration is decreased
  3. There is an increase in humidity
  4. The concentration of CO2 in the environment is increased
Click for Answer/Explanation

Answer – (2)

Fruits respire. They give out ethylene which helps in ripening. When fruits are kept in cold storage the rate of ethylene production can be controlled and thus the self-life of fruits can be increased.

88. Which of these are microscopic, unicellular, and prokaryotic organisms-

  1. Monera
  2. Protista
  3. Fungi
  4. Plantae
Click for Answer/Explanation

Answer – (1)

Monera- are microscopic, unicellular, and prokaryotic organisms. Ex- bacteria, blue-green algae.

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89. The crocodiles belong to which class of animal kingdom?

  1. Ambhibia
  2. Reptilia
  3. Mammalia
  4. Aves
Click for Answer/Explanation

Answer – (2)

They belong to the Reptilia class of animal kingdom.

90. What is common in Amoeba, Ant, spider, and starfish?

  1. lay eggs to reproduce
  2. lack backbone
  3. have scales on their body
  4. None of these
Click for Answer/Explanation

Answer – (2)

91. Which one of the following is the major function of platelets?

  1. clotting of blood
  2. oxygen transport
  3. immmunity
  4. None of these
Click for Answer/Explanation

Answer – (1)

Platelets prevent bleeding. These are colorless cells present in our blood.

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