It is essential for roots to grow down so they can explore the soil and maximise their water uptake. … Scientists have long speculated that plants bend in response to gravity due to the redistribution of the plant hormone auxin in the tip of the root.

What causes roots to grow down?

Roots respond to gravity and shoots grow towards sunlight. Explanation : Roots – Roots grow down because the root respond to gravity by releasing the chemicals that prevent growth on the lower side,thus turning the root downwards.

Why do roots grow downward and shoots grow upwards?

The roots grown downward in the direction of gravity, which is positive gravitropism, and the shoot grows upward away from gravity, which is negative gravitropism. The reason plants know which way to grow in response to gravity is due to amyloplasts in the plants.