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Railways PYQCBT 2 2017

RRB NTPC · Question 56

'Tropism' mostly refers to the :

  1. Directional growth of a plant

  2. Longevity of animal species

  3. Bird migration

  4. Behavioural pattern of humans

Show answer & explanation

Answer: (A) Directional growth of a plant

Explanation

Tropism is the directional growth of a plant part in response to a stimulus – towards light (phototropism), gravity (geotropism) or water (hydrotropism).