11. Which of the following concepts was explained by Stephen Hales?
[A] new species are formed from the sudden and unexpected emergence of alterations in their defining traits.
[B] plant function and behaviour
[C] principles of genetics and inheritance to the improvement of the human race
[D] None of these
Show Answer
Correct Answer: B [plant function and behaviour]
Notes:
Plant physiology is the study of plant function and behaviour. This concepts was explained by Stephen Hales.
12. 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
Show Answer
Correct Answer: A [spontaneous induction]
Notes:
Viral DNA is removed from the host’s chromosomes and the lytic cycle is called spontaneous induction.
13. 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
14. Which of the following may be most likely to be missing from a gram-positive bacterium?
[A] Penicillin-binding protein
[B] Peptidoglycan
[C] Lipopolysaccharide
[D] Phospholipid bilayer membrane
Show Answer
Correct Answer: C [Lipopolysaccharide]
Notes:
Gram-negative bacteria are surrounded by a thin peptidoglycan cell wall. It itself is surrounded by an outer membrane containing lipopolysaccharides.
15. The sporophytic generation is represented only by the zygote__?
[A] Funaria
[B] Chlamydomonas
[C] Pinus
[D] Pinus
Show Answer
Correct Answer: B [Chlamydomonas]
Notes:
Important Features of Chlamydomonas: The plant body is unicellular, pear-shaped, and biflagellate, Each cell typically contains a cup-shaped chloroplast, an eye sac, and two contractile vacuoles, Pamela-stage appearance, Asexual reproduction occurs through biflagellate zoospore formation.
16. The energy wastage in plants occurs during which of the following?
[A] Dark reaction
[B] Photosynthesis
[C] Photorespiration
[D] None of these
Show Answer
Correct Answer: C [Photorespiration]
Notes:
Light helps in the dissipation of respiratory energy where the stomata get clogged during the day due to water stress. Photorespiration protects the plant from photooxidative damage by dissipating excess excitation energy.
17. The grass is an example of which root?
[A] Nodulose Roots
[B] Moniliform Roots
[C] Annulated Roots
[D] Prop Roots
Show Answer
Correct Answer: B [Moniliform Roots]
Notes:
Moniliform roots are swollen and compressed. The grass is an example of Moniliform Roots.
18. Which plant disease is known as ring disease?
[A] Citrus Canker
[B] Black arm of cotton
[C] Wilt of Potato
[D] None of the above
Show Answer
Correct Answer: C [Wilt of Potato]
Notes:
Wilt of Potato is caused by a soil-borne bacterium called Ralstonia solanacearum. Potato wilting bacteria primarily reside in the roots and enter the root system at points of injury from farm tools or equipment and soil pests.
19. Name a disease of plant in which dark to light brown rot forms around wounded plant tissue?
[A] Gray Mold
[B] Citrus Canker
[C] Spider Mites
[D] None of the above
Show Answer
Correct Answer: A [Gray Mold]
Notes:
Gray mold is a plant disease in which dark to light brown rots from around injured plant tissue. Gray mold is caused by the fungus Botrytis cinerea.
20. How many million years ago did adaptive radiation begin in fish?
[A] 1200
[B] 500
[C] 1000
[D] 1500
Show Answer
Correct Answer: B [500]
Notes:
500 million years ago did adaptive radiation began in fish. Fish are a type of animal known as a vertebrate – this means they have a backbone.
