Photoperiodism is substituted by

When the dark period of short-day plants is interrupted by a brief exposure of light,then the plant:

For the germination of seed,which light is necessary?

In which category will you place this plant based on the provided experimental results? Choose the correct option.

In respect of photomorphogenesis,plants are most sensitive to:

Some varieties of wheat are known as spring wheat while others are called winter wheat. The former variety is sown and planted in spring and is harvested by the end of the same season. However,winter varieties,if planted in spring,fail to flower or produce mature grains within a span of a flowering season. Explain,why?