Question

Which one of the following crops is most sensitive to photoperiod?

• A. Wheat
• B. Rice
• C. Maize
• D. Barley

Hint:

Rice is a short-day crop and is commonly used as an example of photoperiod-sensitive plants.

Answer 1

The Correct Option is B

To determine which crop is most sensitive to photoperiod, we need to understand what photoperiod sensitivity means. Photoperiod sensitivity refers to how a plant's growth and maturity are affected by the length of day and night. This sensitivity is crucial for various physiological processes, such as flowering, in many plant species.

The given options are Wheat, Rice, Maize, and Barley. Let's analyze each:

1. Wheat: While wheat has some photoperiod sensitivity, especially in regard to its flowering time, it is generally lower than rice. Wheat varieties can be bred for different growing seasons, which makes them less sensitive overall.
2. Rice: Rice is highly sensitive to photoperiod, particularly short-day conditions. Many rice varieties need a specific duration of daylight to trigger flowering. This is crucial for farmers who rely on certain monsoons to grow their rice crop.
3. Maize: Maize (corn) exhibits moderate photoperiod sensitivity, but many modern varieties have been bred to be less dependent on day length, thus making them more widely adaptable.
4. Barley: Barley is similar to wheat in being moderately sensitive to photoperiod, with flowering and maturity times somewhat dependent on day length, but not as sensitive as rice.

Considering these points, the correct answer is that Rice is the most sensitive to photoperiod among the given crops. The reason is that rice often requires specific day lengths to transition effectively between its growth stages, especially from vegetative growth to flowering.