Biology MCQs

11. At which stage in its life-cycle does the silkworm yield the fibre of commerce? (UPSC Prelims 2000)
[A] Egg
[B] Larva
[C] Pupa
[D] Imago

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12. Which of the following classes belongs to an Octopus? (UPSC Prelims 2003)
[A] an arthropod
[B] an echinoderm
[C] a heimchordate
[D] a mollusc

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13. Which among the following is the smallest endocrine gland in the human body?
[A] Pineal gland
[B] Pancreas
[C] Hypothalamus
[D] Liver

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14. Which of the following is the taxonomic family of humans?
[A] Hominidae
[B] Haplorhini
[C] Primates
[D] Homini

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15. Which among the following genus is known as the ‘handy man’?
[A] Homo sapiens sapiens
[B] Homo habilis
[C] Homo sapiens neanderthelensis
[D] Homo erectus

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16. Which of the following statements are correct with respect to homeostasis?
1. Ecosystems are capable of maintaining their state of equilibrium.
2. They cannot regulate their own species structure and functional processes.
Select the correct option from the codes given below:
[A] Only 1
[B] Only 2
[C] Both 1 & 2
[D] Neither 1 & 2

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17. Who among the following discovered the cell wall?
[A] Robert Hooke
[B] Boveri
[C] J Rhodin
[D] Van Beneden

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18. What kind of sugar is present in sugarcane?
[A] Sucrose
[B] Hexose
[C] Glucose
[D] Ribose

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19. Which of the following virus has its envelope from the host cell nucleus?
[A] Paramyxoviruses
[B] Retroviruses
[C] Orthomyxoviruses
[D] Herpesviruses

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20. Viral DNA is removed from the host’s chromosomes and the lytic cycle is called which of the following process?
[A] spontaneous induction
[B] inductive infection
[C] resultant induction
[D] spontaneous infection

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