4.5.4 Plant hormones

Front

What is the primary function of ethylene in plants?

Back

Ethylene is a plant hormone that regulates fruit ripening, flower wilting, and leaf fall.

Front

What is the role of auxin in plant growth?

Back

Auxin is a plant hormone that promotes cell elongation and is involved in regulating plant responses to light and gravity.

Front

Define gravitropism in plants.

Back

Gravitropism is the growth response of a plant to gravity, where roots grow downward (positive gravitropism) and stems grow upward (negative gravitropism).

Front

What is the main structural component of plant cell walls?

Back

Cellulose is the primary polysaccharide that makes up the structure of plant cell walls.

Front

How does auxin affect phototropism?

Back

Auxin promotes cell elongation on the side of the plant that is away from light, causing the plant to bend towards the light source.

Front

What is the difference between positive and negative gravitropism?

Back

Positive gravitropism refers to the growth of plant roots downward towards gravity, while negative gravitropism refers to the growth of plant stems upward away from gravity.

Front

What is the significance of gibberellins in plant growth?

Back

Gibberellins are hormones that promote stem elongation, seed germination, and flowering.

Front

What is the role of abscisic acid in plants?

Back

Abscisic acid is a plant hormone that helps regulate water loss and stress responses, particularly during drought conditions.

Front

How do cytokinins affect plant growth?

Back

Cytokinins are hormones that promote cell division and can delay aging in plant tissues.

Front

What is the function of auxin in apical dominance?

Back

Auxin produced in the apical bud suppresses the growth of lateral buds, maintaining the plant's upward growth.