For the induction of flowering, some plants require a

(1) Periodic exposure to light

(2) Continuous exposure to light

(3) No exposure to light

(4) No exposure to night

(1) Long day plants

(2) Short day plants

(3) Day neutral plants

(4) Red light plants

(1) Long day plants

(2) Short day plants

(3) Day neutral plants

(4) Far red light plants

1. Only duration of dark period is important

2. Certain plants depend not only on a combination of light and dark exposures but also their relative durations

3. The site of perception for light or dark duration are the leaves

4. There is a hormonal substance which migrates from leaves to shoot apices for inducing flowering only when the plants are exposed to the necessary inductive photoperiod.

(1) by quantitative exposure to low temperature

(2) by qualitative exposure to low temperature

(3) Both A and B

(4) It does not depend on low temperature exposure

(1) Precocious reproductive development late in growing season

(2) Late reproductive development

(3) Flowering

(4) Fruiting

(1) Disables the plant to have fruits

(2) Enables the plants to have fruits

(3) Enables the plants to have sufficient time to reach maturity

(4) Brings senescence

(1) The promotion of flowering by a period of high temperature

(2) The inhibition of flowering by a period of low temperature

(3) The promotion of flowering by a period of low temperature

(4) The inhibition of flowering by a period of high temperature

(1) Wheat

(2) Radish

(3) Barley

(4) Rye

(1) Autumn season, after the end of growing season

(2) Spring season, at the end of growing season

(3) Spring season, before the end of growing season

(4) Autumn season, at the end of growing season