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Question

How many categories of plants are classified based on photoperiodism ?

This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
Three

Photoperiodism Plant Classification Explained

Photoperiodism is the physiological response of organisms, particularly plants, to the length of day and night. This response often influences processes like flowering and dormancy.

Plants are primarily classified into three categories based on their response to photoperiodism:

  • Short-day plants: These plants flower only when the day length is shorter than a certain critical period. Examples include chrysanthemums and poinsettias.
  • Long-day plants: These plants flower only when the day length is longer than a certain critical period. Examples include spinach, lettuce, and radishes.
  • Day-neutral plants: These plants are not sensitive to the photoperiod and will flower regardless of the day or night length. Examples include tomatoes, cucumbers, and peas.

Therefore, there are three main categories of plants classified based on photoperiodism.

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