Phototropism and Geotropism

A plant's response to any stimulus

• dormancy

• tropism

• hibernation

• pollination

The movements in a plant in response to light

• phototropism

• geotropism

• hydrotropism

• thigmotropism

What causes plants to bend toward the sunlight?

• positive thigmotropism

• positive thigmotropism

• negative phototropism

• positive phototropism

Tags

NGSS.MS-LS1-5

When a seed germinates, why do roots grow downward toward the ground?

• positive thigmotropism

• negative hydrotropism

• positive geotropism

• negative phototropism

Tags

NGSS.MS-LS1-5

Which letter on the diagram represents the external stimulus?

• W

• X

• Y

• Z

The diagram shows a plant growing while lying on its side. How is the plant reacting positively and negatively to gravity?

• the root are reacting negatively by growing downward while the stem and leaves are reacting positively by growing upward

• the root are reacting positively by growing downward while the stem and leaves are reacting negatively by growing upward

• only the roots are reacting by growing downward

• only the leaves and stem are reacting by growing upward

Tags

NGSS.MS-LS1-5

The movement of roots toward the ground or the movement of stems away from the ground

• hydrotropism

• geotropism

• thigmotropism

• phototropism

Why does a plant stem grow upward away from the soil?

• positive geotropism

• positive thigmotropism

• negative geotropism

• negative hydrotropism

Which hormone is primarily responsible for phototropism in plants?

• Auxin

• Gibberellin

• Cytokinin

• Ethylene

What is the main difference between phototropism and geotropism?

• Phototropism is a response to light, while geotropism is a response to gravity.

• Phototropism is a response to gravity, while geotropism is a response to light.

• Both are responses to water.

• Both are responses to touch.