Question

Examples of short-day plants are A. Tobacco, Soybean and Rice
B. Tobacco, Soybean and Wheat
C. Tobacco, Barley and Rice
D. Castor, Barley and Sugar beet

• A. A and D only
• B. A only
• C. B and C only
• D. C only

Hint:

Short-day plants need long nights for flowering, while long-day plants need shorter nights.

Answer 1

The Correct Option is B

Step 1: Recall concept of short-day plants.
Short-day plants flower when the photoperiod (day length) is less than a certain critical length, usually shorter than 12 hours. They require longer nights to initiate flowering.
Step 2: Common examples.
Typical short-day plants include Tobacco, Soybean, and Rice. These plants initiate flowering only under short photoperiods.
Step 3: Checking options.
- A: Tobacco, Soybean and Rice → Correct, all are short-day plants.
- B: Tobacco, Soybean and Wheat → Wheat is a long-day plant, so this set is wrong.
- C: Tobacco, Barley and Rice → Barley is a long-day plant, so wrong.
- D: Castor, Barley and Sugar beet → These are not short-day plants, so wrong.
Step 4: Conclusion.
Only option (A) represents true examples of short-day plants.