How do plants react to stimulus

Open Ended

Why do you think the tree grew upward again?

Multiple Choice

Students observed a plant left by a window over several days. The plant was watered daily. After three days, the plant began to grow towards the window as shown in the picture.

Which of the following best explains the student’s observations?

• Heat from the Sun caused the plant to grow towards the window.

• The plant is leaning towards the window to get fresh air.

• The plant is responding to the stimulus of sunlight.

• The plant is responding to water in the air and growing towards it.

Multiple Choice

Anything in the environment that makes an organism act a certain way

• stimulus

• response

• gravity

Multiple Choice

Whatever an organism does when it senses the stimulus

• stimulus

• response

• gravity

Multiple Choice

What happens to the branches of a tree in spring as the temperature changes?

• They become bare

• They get covered with buds

• They fall off

• They turn brown

Multiple Choice

What is one possible reason for seeds to have hooks or barbs?

• to stay warm during the winter

• to protect themselves from sunlight

• to get attached to passing animals and get carried away

• to stick to animals and steal nutrients from them

Multiple Choice

What happens to plants when the temperature drops below 0 °C?

• They thrive and grow

• They produce more fruit

• The water in them can start to freeze

• They stop growing completely

Multiple Choice

A force that pulls objects down.

• air

• the earth

• gravity

• pressure

Multiple Choice

True or False: Roots will grow in the same direction that gravity pulls objects down.

• True

• False

Multiple Choice

True or False: Water is a stimulus that roots will grow towards.

• True

• False