CSAT Prelims Biology - General Awareness Multiple Choice Questions and Answers for IAS/IPS Prelims

1 Regular intake of fresh fruits and vegetables is recommended in the diet since they are a good source of antioxidants. How do antioxidants help a person maintain health and promote longevity?

A They neutralize the free radicals produced in the body during metabolism

B They activate certain genes in the cells of the body and help delay the ageing process

C They activate then enzymes necessary for vitamin synthesis in the body an help prevent vitamin deficiency

D They prevent excessive oxidation of carbohydrates, fats and proteins in the body and help avoid unnecessary wastage of energy

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Answer: Option [A]

2 Which one of the following statements is not correct?

A Milk contains none of the B-vitamins.

B One of the symptoms of scurvy is pain in the joints.

C Vitamin-A (retinol) deficiency leads to dry and scaly skin.

D Vitamin B1 (thiamine) deficiency can lead to heart failure.

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Answer: Option [A]

3 Which of the following cell organelles play the most significant role in protein synthesis?

A Lysosome and Centrosome

B Endoplasmic reticulum and Ribosome

C Lysosome and mitochondria

D Golgi apparatus and Mitochondria

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Answer: Option [B]

4 A person with ‘AB’ blood group is sometimes called a universal recipient because of the

A presence of antibodies in his blood

B lack of both antigens and antibodies in his blood

C lack of antigen in his blood

D lack of antibodies in his blood

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Answer: Option [D]

5 Many transplanted seedling do not grow because

A the new soil does not contain favourable minerals

B most of the root hair grip the new soil too hard

C most of the root hairs are lost during transplantation

D leaves get damaged during transplantation

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Answer: Option [C]

6 When the bark of a tree is removed in a circular fashion all around near its base, it gradually dries up and dies because?

A Roots are starved of energy.

B Tree is infected by soil microbes.

C Water from soil cannot rise to aerial parts.

D Roots do not receive oxygen for respiration.

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Answer: Option [A]

7 Some species of plants are insectivorous. Why?

A They cannot synthesize certain vitamins themselves and depend on the insects digested by them.

B They have remained in that particular stage of evolution as living fossils, a link between autotrophs and heterotrophs.

C Their growth in shady and dark places does not allow them to understake sufficient photosynthesis and thus they depend on insects for nutrition.

D They are adapted to grow in nitrogen deficient soils and thus depend on insects for sufficient nitrogenous nutrition.

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Answer: Option [D]

8 Living organisms require at least 27 elements, of which 15 are metals. Among these, those required in major quantities, include

A sodium, magnesium, copper and manganese

B potassium, sodium, magnesium and calcium

C potassium, molybdenum, copper and calcium

D potassium, manganese, copper and calcium

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Answer: Option [B]

9 A pesticide which is a chlorinated hydrocarbon is sprayed a food crop. The food chain is: Food crop-Rat-Snake-Hawk. In this food chain, the highest concentration of the pesticide would accumulate in which one of the following?

A Food crop

B Rat

C Snake

D Hawk

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