Phytochrome is sensitive to

Phytochrome is a ......

What happens if winter-growing plant species are sown in the spring season?

One set of a plant was grown at $12$ hours day and $12$ hours night period cycles and it flowered,while in the other set,the night phase was interrupted by a flash of light and it did not produce flowers. Under which one of the following categories will you place this plant?

In some plants,flowering is induced only when the duration of light exposure is less than a critical duration. Such plants are called $...............$.

Which of the following pairs is mismatched?