11. Empedocles is related to which of the following theory of biology?
[A] theory of cell
[B] theory of natural selection
[C] theory of mutation
[D] theory of disease
Show Answer
Correct Answer: B [theory of natural selection]
Notes:
Empedocles formulated a theory of natural selection. He proposed that everything in existence is composed of different combinations of four elements: air, fire, water and earth.
12. Which statement is true for the capsid?
[A] It consists of capsomeres
[B] This the outermost layer of most viruses
[C] It protects genetic material
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
A capsid is the protein shell of a type of virus, which encloses its genetic material.
13. A protein that binds to operators or stoperators within prophage to prevent transcription of lytic genes is called__?
[A] immunity repressor
[B] immunity operon
[C] operon repressor
[D] None of these
Show Answer
Correct Answer: A [immunity repressor]
Notes:
A protein that binds to operators or stoperators within prophage to prevent transcription of lytic genes is called immunity repressor.
14. Which of the following is a group of plants that has the largest ovule, the largest gamete and the largest tree?
[A] Angiosperms
[B] Gymnosperms
[C] Pteridophytes
[D] Bryophytes
Show Answer
Correct Answer: B [Gymnosperms]
Notes:
A group of plants that has the largest ovule, the largest gamete and the largest tree is Gymnosperms.
15. What is the botanical name of sea palm?
[A] Polysiphonia
[B] Postelsia
[C] Ectocarpus
[D] Macrocystis
Show Answer
Correct Answer: B [Postelsia]
Notes:
Postelsia piriformis is also known as sea palm or palm seaweed. It is a genus of kelp and is classified within the brown algae.
16. What is the role of indole acetic acid in plant growth?
[A] cell division and elongation
[B] tissue differentiation
[C] apical dominance
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Indole acetic acid is the main auxin in plants that regulates growth and development processes such as cell division and elongation, tissue differentiation, apical dominance, and responses to light, gravity, and pathogens.
17. Which fruit is produced by parthenocarpy?
[A] Brinjal
[B] Apple
[C] Banana
[D] Jackfruit
Show Answer
Correct Answer: C [Banana]
Notes:
Banana fruit is produced by parthenocarpy. The process of development of fruit without any prior fertilization is called parthenocarpy.
18. What does apomixis mean?
[A] Fruit with seed
[B] Fruit without seed
[C] Fruit without fertilization
[D] Seed without fertilization
Show Answer
Correct Answer: D [Seed without fertilization]
Notes:
Apomixis means Seed without fertilization. Apomictic parthenogenesis in which an egg cell develops directly into an embryo without prior fertilization.
19. The spread of plant pathogens through the air is called__.
[A] Hydrochory
[B] Zoochory
[C] Anemochory
[D] Anthorochory
Show Answer
Correct Answer: C [Anemochory]
Notes:
The spread of plant pathogens through the air is called Anemochory. The dispersal of seeds, spores, or fruit by the wind.
20. Planaria and Otoplana are examples of which Platyhelminthes?
[A] Turbellaria
[B] Trematoda
[C] Cestoda
[D] None of these
Show Answer
Correct Answer: A [Turbellaria]
Notes:
Planaria and Otoplana are examples of Turbellaria. They are free-living organisms found mostly in freshwater.
