Question

From the given situations, identify ‘Chemotropic’ and ‘Geotropic’ movements in parts of plants, respectively:

1. Growth of pollen tube towards ovule.
2. Movement of sunflower towards sunlight.
3. Movement of root towards Earth/Gravity.
4. Movement of leaves due to breeze.

Choose the correct option:

Options

• (i) and (iii) respectively

• (iii) and (i) respectively

• (i), (ii) and (iii), (iv) respectively

• (i), (iii) and (ii), (iv) respectively

Answer 1

(i) and (iii) respectively

Explanation:

Chemotropism is growth in response to chemicals, so the pollen tube growing towards the ovule (i) is chemotropic. Geotropism is growth in response to gravity, so the root growing towards Earth (iii) is geotropic.