Why do leaves fall in autumn

1. Why do leaves fall in autumn?

2. light duration

LIGHT DURATION
•THE RELATIVE LENGTH AT DAY AND NIGHT ARE CALLED AS
PHOTOPERIOD.
•THE RESPONSE OF PLANTS TO THE PHOTOPERIOD
EXPRESSED TO THE FORM OF FLOWENNG IS CALLED AS
PHOTOPENODISM. PHOTOPERIODISM ALSO AFLECTS SEED
AND FRUIT PRODUCTION.

3. According to the duration of lIght plants can be categorized into three groups:

ACCORDING TO THE DURATION OF LIGHT
PLANTS CAN BE CATEGORIZED INTO THREE
GROUPS:
SHORT DAY PLANTS
•LONG DAY PLANTS
•DAY NEUTRAL PLANTS

4. Short day plants

SHORT DAY PLANTS
•EXAMPLES: CHRYSANTHEMUMS, RICE, CACTUS.

5. Long day plants

LONG DAY PLANTS
•EXAMPLE: DILL, SPINACH, CARNAUONS.

6. Day neutral plants

DAY NEUTRAL PLANTS
•EXAMPLE: TOMATOES, SUNFLOWER, PEA PLANTS.