Consider the following statements:

1. Gravity does not have role in the deciding direction that plant grows in.
2. Growth of pollen tubes towards ovules is result of geotropism.

Select the incorrect statement using the codes given below.
a)1 Only
b)2 Only
c)Both 1 and 2
d)Neither 1 nor 2

Ans-[C] 

Explanation-Environmental triggers such as light, or gravity change the directions that plant parts grow in. These directional, or tropic, movements can be either towards the stimulus, or away from it. So, in two different kinds of phototropic movement which is movement influenced by light, shoots respond by bending towards light while roots respond by bending away from it.

The roots of a plant always grow downwards while the shoots usually grow upwards and away from the earth. This upward and downward growth of shoots and roots, respectively, in response to the pull of earth or gravity is, geotropism. Thus gravity has a role in the direction that plant grows in.

Growth of pollen tubes towards ovules is due to chemotropism.