NEET 2015
- Exam
- NEET
- Year
- 2015
- Subject
- Botany
- Chapter
- Plant - Growth and Development
NEET 2015 · Botany · Plant - Growth and Development
What causes a green plant exposed to the light on only one side, to...
What causes a green plant exposed to the light on only one side, to bend toward the source of light as it grows?
Options
- AGreen plants need light to perform photosynthesis.
- BGreen plants seek light because they are phototropic.
- CLight stimulates plant cells on the lighted side to grow faster.
- DAuxin accumulates on the shaded side, stimulating greater cell elongation there.
Correct answer
D. Auxin accumulates on the shaded side, stimulating greater cell elongation there.
Step-by-step solution
Auxins accumulates on the shaded side, stimulating grater cell elongation there. Since auxins move from morphological apex to morphological base therefore gets accumulated on the shaded side. Thus plants exposed to the light on only one side bends towards the source of light. It is also due to the tropic movement of auxins which causes phototropism and geotropism in plants.