11. Why honey bees are called social insects? (UPSC Prelims 1982)
[A] They visit all flowers to collect nectar
[B] They live in large family groups
[C] They depend for their food upon other insects
[D] They move socially with other insects
Show Answer
Correct Answer: B [They live in large family groups]
Notes:
Social insects are highly evolved insects that engage in a variety of complex tasks not practiced by the multitude of solitary insects. Honey bees are social insects because they live together in large, well-organized family groups. A single honeybee cannot grow or survive by itself. The three distinct kinds of honeybees in a colony are queen, worker, and drone.
12. Which of the following plants is biennial? (UPSC Prelims 1989)
[A] Banana
[B] Pineapple
[C] Jack fruit
[D] Carrot
Show Answer
Correct Answer: D [Carrot]
Notes:
The Carrot plant is biennial and develops, in its second year.
13. 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
Show Answer
Correct Answer: C [Pupa]
Notes:
Silk worm yield the fibre from pupa stage, which is commercially used to produce clothes.
14. 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
Show Answer
Correct Answer: B [Homo habilis]
Notes:
Homo habilis– He had a face similar to his ancestors. The skull and brain size indicate that he may have been able to speak. The earliest tools made were from this era. Homo habilis is known as the ‘handy man’ because he was the first to make and use tools.
15. In the branch of biology, what is the transmission of paternal traits to progeny called?
[A] Genetics
[B] Heredity
[C] Gerontology
[D] Genetic Engineering
Show Answer
Correct Answer: B [Heredity]
Notes:
The transmission of characteristics from parent to offspring is called heredity, and can be inferred from inherited characteristics.
16. Gonyaulax, which are known for causing red tides, belong to which of the following?
[A] Algae
[B] Fungi
[C] Protista
[D] Bacteria
Show Answer
Correct Answer: C [Protista ]
Notes:
Red tides are caused by Gonyaulax which are small, microscopic organisms that grow in water and also called dinoflagellates.
17. What type of embryo is most often used for viral assays?
[A] Mouse
[B] Rat
[C] Cat
[D] Chicken
Show Answer
Correct Answer: D [Chicken]
Notes:
Chicken is a type of embryo is most often used for viral assays.
18. Classification is based on the following criteria?
[A] Plant body
[B] Vascular system
[C] Seed formation
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Classification is based on the following criteria: Plant body, Vascular system and Seed formation
19. An important product of the Krebs cycle is__?
[A] Water
[B] Methane
[C] ATP
[D] None of the above
Show Answer
Correct Answer: C [ATP]
Notes:
An important product of the Krebs cycle is ATP. Adenosine triphosphate (ATP) is a source of energy for use and storage at the cellular level.
20. Which of the following is a heterotrophic plant?
[A] Parasitic
[B] Insectivorous
[C] Symbiotic
[D] All of these
Show Answer
Correct Answer: D [All of these]
Notes:
Heterotrophic plants which are mainly classified on the basis of their mode of nutrition are parasites, insect eaters, mortal, symbiotic.
