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.

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.

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

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

The growth of a plant in response to touch is?

Substances that act as chemical messengers within plants are called?

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

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

Which two hormones both increase the rate of cell division?

Stems growing up against gravity is called?