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

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

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.

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

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

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

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.

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.

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

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

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

Answer: Option [C]

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