Question

_________geotropism is seen in plants.
A.Positive
B.Negative
C.Neutral
D.Both A and B

Answer 1

Hint: 1.Plants after they get planted grow in both the directions based on the requirements of different parts to grow.
2.This growth of plants is due to Geotropism.

Complete answer:
Geotropism is defined as the growth of plant parts in response to the force of gravity. Different parts of the plant grow in opposite directions because of the kind of role they play in the plant. Let us analyze the options to find out the correct option.

Option A: Positive geotropism is the movement of the plant part towards the force of gravity. Roots of plants show positive geotropism as they grow towards the direction of gravity that is towards the ground. Therefore, this is the incorrect option.

Option B: Negative geotropism is the movement of a plant part away from the force of gravity. Shoot of the plant shows negative geotropism as they move away from the force of gravity which means away from the ground. Therefore, this is the incorrect option.

Option C: Neutral geotropism is not shown any of the plant parts as all the plant parts grow in some direction in response to gravity. Therefore, this is the incorrect option.

Option D: Both A and B are correct because plants show both negative and positive geotropism. Therefore, this is the correct option.

Hence, the correct answer is option (D)

Note: Roots grow downward as it provides stability, nutrients and water to the plant which is present in the soil. Stem grows upward as it provides water and nutrients to other parts of the plant so that plant can perform photosynthesis. This is due to geotropism.