In plant physiology, the 'Vernalization' refers to the induction of flowering by: MCQ with Answer and Explanation

In plant physiology, the 'Vernalization' refers to the induction of flowering by:
A. Exposure to continuous darkness
B. Exposure to a prolonged period of low temperature
C. Exposure to high temperatures
D. Exposure to continuous light
Answer: Option B
Solution (By JKExamLibrary)
Vernalization is the process by which many plants, particularly biennials and winter annuals (like winter wheat, cabbage, and carrots), require exposure to a prolonged period of low temperature (cold treatment) before they can initiate flowering. This prevents the plant from flowering in the autumn, ensuring it survives the winter and flowers in the spring or summer. The cold stimulus is perceived by the apical meristem or the germinating seed.

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Question #1
Which of the following is a benefit of using biopesticides over chemical pesticides?
A. They are broad-spectrum and kill all insects.
B. They are non-biodegradable and persist in the environment.
C. They are target-specific and environmentally friendly.
D. They increase soil salinity.

Correct Answer: Option C


Explanation:
Biopesticides, such as Bacillus thuringiensis (Bt), neem extracts, and Trichoderma, are generally target-specific, affecting only certain pests while sparing beneficial organisms, humans, and the environment. They are biodegradable and do not accumulate. Chemical pesticides often kill a wide range of species, persist, and cause pollution. Biopesticides are key in Integrated Pest Management (IPM).

This question belongs to: Science Biology
Question #2
Consider statements about human physiology: 1. The pancreas secretes both digestive enzymes and hormones. 2. The liver secretes bile, which contains digestive enzymes. 3. The gall bladder stores and concentrates bile. Which are correct?
A. 1 and 2 only
B. 2 and 3 only
C. 1, 2 and 3
D. 1 and 3 only

Correct Answer: Option D


Explanation:
The pancreas is a mixed gland; its exocrine part secretes digestive enzymes (trypsin, lipase, amylase), and its endocrine part (Islets of Langerhans) secretes hormones (insulin, glucagon). The liver continuously secretes bile, but bile does not contain digestive enzymes; it contains bile salts that emulsify fats. The gall bladder stores and concentrates this bile before releasing it into the duodenum. Thus, statements 1 and 3 are correct.

This question belongs to: Science Biology
Question #3
Assertion (A): Oxygen is required for aerobic respiration.
Reason (R): Oxygen acts as the final electron acceptor in the electron transport chain.
A. A false, R true.
B. Both A and R are true, and R is the correct explanation.
C. Both A and R are true, but R is not the correct explanation.
D. A true, R false.

Correct Answer: Option B


Explanation:
In aerobic respiration, oxygen accepts electrons at the end of the ETC, forming water. Without it, the chain would halt. This directly explains why oxygen is required.

This question belongs to: Science Biology