Which situation will be called negative phototropism?
Answer and explanation
Correct answer: A root growing away from light
Phototropism is a growth response to light, and the sign depends on the direction of growth relative to the light stimulus. Growth towards light is positive phototropism, as commonly seen in shoots; growth away from light is negative phototropism. Therefore, a root growing away from light fits option A. Tendril coiling is thigmotropism, while pollen-tube growth towards chemicals is chemotropism.
Frequently asked questions
What is the correct answer to this question?
A root growing away from light
Why is this the correct answer?
Phototropism is a growth response to light, and the sign depends on the direction of growth relative to the light stimulus. Growth towards light is positive phototropism, as commonly seen in shoots; growth away from light is negative phototropism. Therefore, a root growing away from light fits option A. Tendril coiling is thigmotropism, while pollen-tube growth towards chemicals is chemotropism.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
