Question

Which of the following is a day-neutral plant?
A.Maize
B.Paddy
C.Cucumber
D.All of the above

Answer 1

Hint:A day-neutral plant is that which has no positive photoperiodism. This means that plants blooms or flowers despite the sense of day or night. The plant shows no effect on the light it is exposed to. The Kharif and Zaid crops are mostly day-neutral.

Complete answer:Photoperiodism is a phenomenon in which plants and animals respond to the exposure of light for the functioning of the various system inside their body. Both plants and animals have senses that detect the presence and absence of light. The plants are capable of showing reaction towards the periods of light. They can detect day and night. Based on this the plant flowers or blooms majorly during the day as days are represented by sunlight that is needed for food and energy production in plants. So, we can say that photoperiodism is the amount of light the plant requires to bloom.
Some plants bloom regardless of the amount of daylight they receive or are exposed to. These plants are called day-neutral plants. There are different plants based on their requirement of the amount of light to bloom. The short-day plants need a light period of fewer than 12 hours. On the other hand, a day-long plant requires a light period of more than 12 hours. But a day-neutral plant does not have these time constraints.
The day-neutral plants can bloom in either condition regardless of the amount of light they receive. All of the self-pollinating grass and wheat species including climbing species like cucumber are day-neutral. Cucumber is a Zaid crop that grows in the summer season. Maize and paddy are Kharif crops that grow in the rainy season. All of these are day-neutral plants.
So, the right answer is option D, All of the above.

Note: The plants bloom only in a particular season on the basis of photoperiods they receive. The plants contain a protein that is sensitive to light. This is called a phytochrome. Different plants have different requirements for light. Thus, crop plants need to be managed according to their light requirements to get a high yielding bloom.