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CSAT Prelims Biology - General Knowledge Questions and Answers for UPSC Exam | Page-1

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Free download PDF of CSAT prelims general awareness multiple choice questions(MCQs) and answers on biology. These previous years solved questions are helpful to crack IAS/IPS/IFS prelims paper I exam.
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(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

Comment

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.

Comment

Answer: Option [A]

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(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

Comment

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

Comment

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

Comment

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.

Comment

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.

Comment

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

Comment

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

Comment

Answer: Option [D]
(10) “Metastasis” is the process by which
[A] cells divide rapidly under the influence of drugs
[B] cancer cells are successfully inhibited to divide any further
[C] cancer cells spread through the blood or lymphatic system to other sites or organs
[D] the chromosomes in cells nuclei are attached to the spindle before moving to the anaphase poles

Comment

Answer: Option [C]

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