BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Charles Darwin was one of the first to scientifically document that roots show positive gravitropism and stems show negative gravitropism. That is, roots grow in the direction of gravitational pull (i.e., downward) and stems grow in the opposite direction (i.e., upwards).

Detailed explanation-2: -When the stem grows against the force of gravity (upwards), this is known as a negative gravitropism. When a root grows in the direction of the force of gravity (downwards), this is known as a positive gravitropism.

Detailed explanation-3: -The roots of a plant demonstrate negative gravitropism, and the shoots of a plant demonstrate positive gravitropism.

Detailed explanation-4: -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.

Detailed explanation-5: -Roots move away from the light, which is called phototropism or grow towards gravity, which is called gravitropism. The combination of phototropism and gravitropism allow plants to grow in the correct orientation.