Question

Photoperiodism was first characterized in:

• A. Potato
• B. Tobacco
• C. Tomato
• D. Cotton

Answer 1

The correct option is B

Tobacco

The correct option is B.

Explanation of the correct option:

1. Photoperiodism is defined as the developmental response of plants to light and dark periods.
2. It was discovered by Garner and Allard in 1920.
3. They used tobacco plants for their discovery.
4. They observed that a certain variety of tobacco could be made to flower in the summer by reducing the duration of light hours.

Explanation of the incorrect options:

Option A:

1. Potato is a short-day plant with respect to tuber formation.
2. It is a long day plant with respect to flowering.

Option C:

1. Tomatoes are day-neutral plants.
2. They flower irrespective of the length of the day.

Option D:

1. Cotton is a short-day plant.
2. It flowers when exposed to light for a shorter duration than the critical maximum period.

Final answer: Photoperiodism was first characterized in tobacco.