In a horizontally placed plant, the root bends downward and the stem bends upward. Which conclusion is most correct?
Answer and explanation
Correct answer: The root shows positive geotropism and the stem shows negative geotropism
The governing concept is geotropism, the growth response to gravity. The root grows in the direction of gravitational pull, so it exhibits positive geotropism. The stem grows away from that direction, so it exhibits negative geotropism. Thus option A is correct. Option B reverses the signs, while chemotropism concerns chemicals and a reflex arc is a nervous-system pathway absent from ordinary plant growth.
Frequently asked questions
What is the correct answer to this question?
The root shows positive geotropism and the stem shows negative geotropism
Why is this the correct answer?
The governing concept is geotropism, the growth response to gravity. The root grows in the direction of gravitational pull, so it exhibits positive geotropism. The stem grows away from that direction, so it exhibits negative geotropism. Thus option A is correct. Option B reverses the signs, while chemotropism concerns chemicals and a reflex arc is a nervous-system pathway absent from ordinary plant growth.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
