Abscisic acid (ABA) is often called the 'stress hormone' because it: MCQ with Answer and Explanation

Question
Abscisic acid (ABA) is often called the 'stress hormone' because it:
A. Promotes seed germination
B. Promotes cell division
C. Accelerates fruit ripening
D. Induces stomatal closure during water stress
Answer: Option D
Solution (By JKExamLibrary)
Abscisic acid (ABA) is known as the stress hormone because it plays a crucial role in plant responses to environmental stresses, particularly drought. It induces the closure of stomata to reduce water loss (transpiration) and also inhibits seed germination and growth, helping the plant survive adverse conditions.
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Question #1
Consider statements about photosynthesis: 1. Light reactions occur in the grana. 2. The Calvin cycle occurs in the stroma. 3. Oxygen is released from CO2. Which are correct?
A. 1 and 3 only
B. 2 and 3 only
C. 1 and 2 only
D. 1, 2 and 3
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Correct Answer: Option C

Explanation:
Photosynthesis consists of light-dependent reactions occurring in the thylakoid membranes (grana) where water is split, releasing oxygen, and light-independent reactions (Calvin cycle) occurring in the stroma where CO2 is fixed. The oxygen released during photosynthesis comes from the photolysis of water, not from carbon dioxide. Thus, statements 1 and 2 are correct.
This question belongs to: Science Biology
Question #2
The disease caused by the bacterium Clostridium tetani is:
A. Tetanus
B. Botulism
C. Gangrene
D. Leprosy
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Correct Answer: Option A

Explanation:
Tetanus (lockjaw) is caused by a neurotoxin produced by Clostridium tetani, which enters through wounds and causes painful muscle spasms. Botulism is C. botulinum, gas gangrene C. perfringens, leprosy M. leprae.
This question belongs to: Science Biology
Question #3
The hormone that induces ovulation in females is:
A. Estrogen
B. FSH
C. Progesterone
D. LH
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Correct Answer: Option D

Explanation:
A mid-cycle surge in luteinizing hormone (LH) triggers the final maturation and release of the secondary oocyte from the Graafian follicle (ovulation). FSH stimulates follicle growth, estrogen proliferates uterine lining, progesterone maintains it.
This question belongs to: Science Biology
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