Question

When plant seedlings emerge from the ground, the leaves always grow upwards while the root system grows downward into the ground.

Explain the force used by plants to determine their growth direction.
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Answer 1

Answer:

Tropism is the force used by the plants to grow in a specific direction.

Explanation:

The movement of plant parts such as shoots and roots etc in a specific direction in response to an external stimulus, this phenomena is known as tropism. Phototropism refers to the movement of upper part of plant body towards sunlight while on the other hand, the movement of roots downward against sunlight is known as geotropism. Both phototropism and geotropism are the types of tropism.