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CSAT Prelims Biology - General Knowledge Questions and Answers for UPSC Exam | Page-6

51 Within biological communities, some species are important in determining the ability of a large number of other species to persist in the community. Such species are called
A Keystone species
B Threatened species
C Allopatric species
D Sympatric species

Answer: Option [A]
52 Which one of the following is monogamous?
A Seal
B Wolf
C Deer
D Walrus

Answer: Option [C]
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53 In making the saffron spice, which one of the following parts of the plant is used?
A Stigma
B Sepal
C Petal
D Leaf

Answer: Option [A]
54 Mycorrhizal biotechnology has been used in rehabilitating degraded sites because mycorrhiza enable the plants to
I. resist drought and increase absorptive area
II. tolerate extremes of pH
III. resist disease infestation

Select the correct answer using the codes given below.

A I only
B II and III only
C I and III only
D I, II and III

Answer: Option [D]
55 “By Weaving threads of physics, chemistry and biology into a rich tapestry, this remarkable scientist provided a unifying molecular view of the world. He touted the wonderful properties of Vitamin C, first as a cure of common cold and later as preventing agent against cancer.” One of science’s major figures of all time referred to above is
A G. N. Lewis
B Fritz London
C Linus Carl Pauling
D Walter Heitle

Answer: Option [C]
56 The major chemical compound found in kidney stones is:
A urea
B calcium carbonate
C calcium oxalate
D calcium sulphate

Answer: Option [C]
57 Daily intake of proteins, recommended for a moderately active woman is
A 43 g
B 44 g
C 45 g
D 46 g

Answer: Option [D]
58 Examine the following three statements:
I. Processed meat is a perishable food
II. All perishable foods are packed in sealed tins
III. Sealed tins sometimes to do not contain processed meat

Which one of the following inferences can be drawn from the above statements?

A Sealed tins always contain perishable food
B Processed meat is sometimes not packed in sealed tins
C Processed meat is always packed in sealed tins
D Non-perishable foods are never packed in sealed tins

Answer: Option [B]
59 Consider the following statements:
I. Femur is longest bone in the human body.
II. Cholera is a disease caused by bacteria.
III. ‘Athlete’s foot’ is a disease caused by virus.

Which of the statements given above are correct?

A I and II
B II and III
C I and III
D I, II and III

Answer: Option [A]
60 Consider the following statements with reference to the human body:
I. The common bile duct releases its contents into stomach.
II. The pancreatic duct releases its contents into duodenum.

Which of the statements given above is/are correct?

A I only
B II only
C Both I and II
D Neither I nor II

Answer: Option [B]


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