Exams › NEET › Biology

What causes a green plant exposed to the light on only one side, to bend toward the source of light as it grows?

1. Green plants seek light because they are phototropic
2. Light stimulates plant cells on the lighted side to grow faster
3. Auxin accumulates on the shaded side, stimulating greater cell elongation there
4. Green plants need light to perform photosynthesis

Correct answer: Auxin accumulates on the shaded side, stimulating greater cell elongation there

Solution

When light hits only one side, auxin moves to the shaded side of the stem. Cells there elongate more than cells on the lit side, so the plant bends toward the light.

Related NEET Biology questions

• Start of synthesis of chlorophyll in a plant seedling is stimulated by
• Typical growth curve in plants is:
• Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in:
• Coiling of garden pea tendrils around any support is an example of:
• Opening of floral buds into flowers, is a type of:
• Movement of leaves of Sensitive Plant, Mimosa pudica are due to:

⚔️ Practice NEET Biology free + battle 1v1 →