Tropisms and Hormones

Any change in an organism’s environment that causes the organism to react. Example: The Sun would be this for a plant demonstrating phototropism.

• Stimulus

• Response

• Effect

• Force

This plant hormone was one of the first plant hormones discovered, it is responsible for phototropism, the growth of a plant toward light. This hormone concentrates on the dark side of the plant's stem.

• Auxin

• Ethylene

• Gibberellins

• Cytokinins

A response that results in plant growth toward or away from a stimulus is a?

• Stimulus

• Tropism

• Photoperiodism

• Plant Hormone

The growth of a plant toward or away from light is called?

• Stimuli

• Phototropism

• Thigmotropism

• Geotropism

The growth of a plant in response to touch is?

• Stimuli

• Phototropism

• Thigmotropism

• Geotropism

Substances that act as chemical messengers within plants are called?

• Tropisms

• Stimuli

• Plant Hormones

• Nerves

Rapidly growing areas of a plant, such as roots and stems, produce this hormone. These hormones increase the rate of cell division and elongation.

• Auxins

• Ethylene

• Gibberellins

• Cytokinins

Root tips produce this hormone which increases the rate of cell division and can also slow the aging process of flowers and fruits.

• Auxins

• Ethylene

• Gibberellins

• Cytokinins

Which two hormones both increase the rate of cell division?

• Auxins and Ethylene

• Ethylene and Gibberellins

• Gibberellins and Cytokinins

• Cytokinins and Auxins

Stems growing up against gravity is called?

• Negative Geotropism

• Positive Geotropism

• Negative Thigmotropism

• Positive Thigmotropism