EFFECTS OF LIGHT ON PLANTS

Synthesis of pigments: The plants grown in the absence of light become etiolated.

Photosynthesis: The light intensity at which rate of photosynthesis is just sufficient to meet the requirements of respiration is called compensation point.

Photoperiodism: angiosperms are divided into three categories. Long-day plants(e.g. Radish, Spinach, Scale cereale, etc.) short-day plant(e.g. xanthium, Chrysanthemum, Cosmos, Datura, salvia, Cannabis)and day-neutral Plants(e.g. Cotton Gossypium, Tomato—Lycopersicum, Potato solanum)

Transpiration

Plant growth

Stomatal opening