science
Grade-4-
Easy

Question

The word “photo” in phototropism means:

  1. Heat
  2. Light
  3. Pressure
  4. Gravity  

hintHint:

It comes from an Ancient Greek word.

The correct answer is: Light


    The correct option is b) Light.
    A photon (from the ancient Greek pōtós) for "light" is an elementary particle, a quantum of electromagnetic fields, including electromagnetic radiation such as light and radio waves, and a force carrier of electromagnetic force.
    The prefix "photo" means "light" and the suffix "tropism" means "rotation". Therefore, phototropism is the ability of plants to orient themselves towards the light. Growing towards the light source is called positive phototropism and growing away from the light is called negative phototropism.

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