Question

What is Photoperiodism ?
Explain with examples.

Answer 1

Photoperiodism is the physiological reaction of organisms to the length of night or a dark period. It occurs in plants and animals. Photoperiodism can also be defined as the developmental responses of plants to the relative lengths of light and dark periods. They are classified under three groups according to the photoperiods: short-day plants, long-day plants, and day-neutral plants.

Answer 2

Answer:

PHOTOPERIODISM :-

☆ it is defined as the developmental responses of plants to the relative lengths of light and dark periods.

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more about Photoperiodism :-

• it has been observed that some plants require a periodic exposure to light to induce flowering
• it is also seen that such plants are able to measure the duration of exposure to light.

Example :-

● some plants require the exposure of light for a period exceeding a well defined critical duration , while others must be exposed to light for a period less than this critical duration before the flowering is initiated in them .

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further process :-

• the former group of plants are called long day plants while the latter ones are termed short day plants .
• The critical duration is different for different plants , however, where there is no such correlation between exposure to light duration and induction of flowering response , such plants are called day - neutral plants.

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☆ hence, it can be said that flowering in certain plants depends not only on a combination of light and dark exposures but also their relative durations.

☆ This response of plants to periods of day / night is termed as PHOTOPERIODISM .