BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Root growth shows characteristic tropisms including positive geotropism (growth in the direction of gravity, also described as positive gravitropism) and avoidance of obstacles (sometimes described as negative thigmotropism).

Detailed explanation-2: -Plant parts can grow with or against gravity. This type of tropism is called gravitropism. Roots of a plant grow downward and exhibit positive gravitropism.

Detailed explanation-3: -Positive gravitropism occurs when roots grow into soil because they grow in the direction of gravity while negative gravitropism occurs when shoots grow up toward sunlight in the opposite direction of gravity.

Detailed explanation-4: -Plant roots have positive gravitropism, growing towards the center of Earth. But leaves and stems do the opposite–negative gravitropism. Botanists don’t yet fully understand how plants can perceive gravity and respond to it. One of the most well-accepted theories involves the hormone known as auxin.

Detailed explanation-5: -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.