Organisms' Response to Stimuli

What is a stimulus?

• A type of plant

• A change or signal in an organism's environment that it can recognize and react to

• A special kind of animal

• A type of weather condition

How did the eagle in the video respond to seeing a fish?

• It flew away

• It made a loud noise

• It dove down and caught the fish with its talons

• It landed on the shore

What is the plant's response to light called?

• Geotropism

• Photosynthesis

• Phototropism

• Chemotropism

How do sunflower plants respond to the sun's movement?

• They close their petals

• They turn their heads to follow the sun

• They grow taller

• They change color

What is the plant's response to gravity called? Choose the two that are correct.

• Phototropism

• Geotropism

• Gravitropism

• Chemotropism

How does the Venus flytrap respond when an insect lands on its leaves?

• It grows taller

• It releases a scent

• It changes color

• It closes its leaves to capture the insect

What is a rabbit's typical response to sensing a predator?

• It attacks the predator

• It plays dead

• It runs away to escape

• It calls for help

How do many bird species respond to the approach of winter?

• They hibernate

• They migrate to warmer areas

• They grow thicker feathers

• They store food

How does an earthworm typically react to light?

• It moves towards the light

• It stays still

• It moves away from the light

• It changes color

How do single-celled organisms like amoeba respond to a food source?

• They move away from it

• They move towards it

• They divide into two cells

• They become dormant