Neet Solved Paper 2015 Question 20
Question: What causes a green plant exposed to the light on only one side, to bend toward the source of light as it grows?
Options:
A) Green plants need light to perform photosynthesis
B) Green plants seek light because they are phototropic
C) Light stimulates plant cells on the lighted side to grow faster
D) Auxin accumulates on the shaded side, stimulating greater cell elongation there
Show Answer
Answer:
Correct Answer: D
Solution:
*This phenomenon is known as phototropism. When a plant is exposed to light on only one side, the hormone auxin accumulates on the shaded side of the plant. This causes the cells on the shaded side to elongate more than those on the lighted side, resulting in the plant bending toward the light source.
BETA
