Question

Movement of roots in search of moisture is called ______.

Options

• geotropism

• thigmotropism

• phototropism

• hydrotropism

Answer 1

Movement of roots in search of moisture is called hydrotropism.

Explanation:

Hydrotropism is the growth or movement of a plant part in direct response to a water or moisture gradient. Plant roots are positively hydrotropic, meaning they sense differences in moisture levels in the surrounding soil and actively bend and grow toward areas with a higher water concentration. This vital survival mechanism ensures that the plant secures an adequate water supply, even when it means overriding the default downward pull of gravity (geotropism).