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BZ 440 Final Questions and Correct
Answers/ Latest Update / Already Graded
What parameters do plants sense in light?
Ans: Quality, intensity, and duration
What are photoreceptors in plants responsible for?
Ans: Absorbing specific wavelengths and triggering signaling
cascades that alter gene expression
How many types of photoreceptors are there in plants?
Ans: Three types
What are the two forms of phytochromes?
Ans: Pr (inactive) and Pfr (active)
What happens to phytochrome when exposed to red light?
Ans: It converts from Pr to Pfr
What is the role of Pfr in plants?
All rights reserved © 2025/ 2026 |
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Ans: It moves into the nucleus and regulates developmental
transitions
What triggers shade-avoidance responses in plants?
Ans: Low red-to-far-red light ratios beneath canopy shade
What is phototropism?
Ans: Growth of a plant towards light, caused by altered auxin
transport
What regulates stomatal opening in response to blue light?
Ans: Phosphorylation of the H+-ATPase in guard cells
How do short-day plants determine the right time for flowering?
Ans: Nights must exceed a species-specific minimum duration
What is the coincidence model in flowering?
Ans: It explains flowering when the expression of the flowering
master gene overlaps with daylight
All rights reserved © 2025/ 2026 |
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What is the role of CONSTANS (CO) in flowering?
Ans: It activates FT in long-day plants and inhibits it in short-
day plants
What is the function of the FT protein?
Ans: It acts as a florigen and moves from leaves to the shoot
apical meristem
What does the ABC model explain?
Ans: How A, B, and C gene combinations specify floral organ
identity
What is vernalization?
Ans: The process that removes repression at the meristem
through epigenetic modifications
What is double fertilization in angiosperms?
Ans: It produces a diploid embryo and a triploid endosperm
What triggers fruit development after fertilization?
All rights reserved © 2025/ 2026 |
BZ 440 Final Questions and Correct
Answers/ Latest Update / Already Graded
What parameters do plants sense in light?
Ans: Quality, intensity, and duration
What are photoreceptors in plants responsible for?
Ans: Absorbing specific wavelengths and triggering signaling
cascades that alter gene expression
How many types of photoreceptors are there in plants?
Ans: Three types
What are the two forms of phytochromes?
Ans: Pr (inactive) and Pfr (active)
What happens to phytochrome when exposed to red light?
Ans: It converts from Pr to Pfr
What is the role of Pfr in plants?
All rights reserved © 2025/ 2026 |
, Page |2
Ans: It moves into the nucleus and regulates developmental
transitions
What triggers shade-avoidance responses in plants?
Ans: Low red-to-far-red light ratios beneath canopy shade
What is phototropism?
Ans: Growth of a plant towards light, caused by altered auxin
transport
What regulates stomatal opening in response to blue light?
Ans: Phosphorylation of the H+-ATPase in guard cells
How do short-day plants determine the right time for flowering?
Ans: Nights must exceed a species-specific minimum duration
What is the coincidence model in flowering?
Ans: It explains flowering when the expression of the flowering
master gene overlaps with daylight
All rights reserved © 2025/ 2026 |
, Page |3
What is the role of CONSTANS (CO) in flowering?
Ans: It activates FT in long-day plants and inhibits it in short-
day plants
What is the function of the FT protein?
Ans: It acts as a florigen and moves from leaves to the shoot
apical meristem
What does the ABC model explain?
Ans: How A, B, and C gene combinations specify floral organ
identity
What is vernalization?
Ans: The process that removes repression at the meristem
through epigenetic modifications
What is double fertilization in angiosperms?
Ans: It produces a diploid embryo and a triploid endosperm
What triggers fruit development after fertilization?
All rights reserved © 2025/ 2026 |
