Question

Choose the correct statements of the following: A) Long day plant will not flower if the daylength is above the critical photoperiod. B) Biennials are monocarpic plants that normally flower and die in second season. C) Practice of layering the seeds during winter in layer of moist sand and peat is called prechilling. D) ABA plays an important role as antagonist to GAs.

• A. A, B, C
• B. B, C, D
• C. A, C, D
• D. A, B, D

Hint:

ABA = "Stop/Dormancy"; GAs = "Go/Growth"; they work against each other.

Answer 1

The Correct Option is B

Step 1: Understand the question.
Four statements (A, B, C, D) deal with photoperiodism, life span, seed treatment, and hormones. We mark each true or false and pick the set.

Step 2: Check statement A.
A says a long-day plant will not flower if the day length is above the critical period. This is wrong. Long-day plants actually flower when day length is above the critical limit. So A is false.

Step 3: Check statement B.
B says biennials are monocarpic plants that flower and die in the second season. This is true. Biennials live two seasons and flower once. So B is correct.

Step 4: Check statement C.
C describes keeping seeds in moist sand and peat during winter, called prechilling. This cold-moist treatment (stratification or prechilling) breaks dormancy. So C is correct.

Step 5: Check statement D.
D says ABA acts as an antagonist to gibberellins (GAs). This is true. Abscisic acid opposes the growth-promoting action of GAs. So D is correct.

Step 6: Pick the right set.
The correct statements are B, C and D.
\[ \boxed{\text{B, C, D}} \]