Plant Responses and Growth

Directional growth of a plant, or part of a plant, in response to an external stimulus.

• temperature

• ethylene

• photoperiodism

• tropism

What is an action or condition that is reaction to a stimulus.

• stimulus

• response

What is an action or condition that causes a response?

• stimulus

• response

When does a plant's roots grow towards the source of water?

• temperature

• hydrotropism

• photoperiodism

• tropism

What is the stimulus if a plant that grows in the direction of or away from a source of heat or cold.

• light

• sound

• temperature

• touch

How many types of tropism are there?

• four

• six

• nine

• two

If a plant called a Rhododendron curls its leaves away when it experiences cold weather it has a ____ response to the cold.

• positive

• negative

• neutral

When the roots grow downward with gravity it has a ________ reaction.

• positive

• negative

When the stalk of a plant grow upward against gravity it has a ________ reaction.

• positive

• negative

What is thigmotropism? A Venus Fly Trap show this when a bug is nearby.

• It grows in the direction of the bug.

• It closes when a bug or some other object touches it.

• It closes when it hears the sound of a bug nearby.