Plant Systems

How is the turgor pressure force exerted on the inside of a seed to split it open so it can emerge into a seedling?

• Water within the seed pushes out against the seed coat

• Gravity pushes up on the seed coat

• Gravity pulls down on the seed coat

• Water from the soil pushes in through the seed coat

What are xylem?

• series of tubes that carry water from roots to the leaves

• series of tubes that carry water from leaves to the atmosphere

• series of tubes called roots

• series of tubes call leaves

Tags

NGSS.MS-LS2-3

Leaves and stems growing towards the sunlight exhibits what kind of tropism?

• geotropism

• phototropism

• gravitropism

• autotropism

In a germinating seed, the downward growth of roots and the upward growth of leaves and stems are the plant's response to what?

• water

• osmosis

• sunlight

• gravity

Tags

NGSS.MS-LS1-5

What is the internal stimulus that would cause a plant to wilt?

• Exposure to too much sunlight

• Exposure to very little sunlight

• A lack of water in the stem

• An abundance of water in the stem

Tags

NGSS.MS-LS2-1

What internal and external conditions would most likely cause the stomata in a plant to be open?

• There is a lack of water in the plant, and it is daytime.

• There is a lack of water in the plant, and it is nighttime.

• There is plenty of water in the plant, and it is daytime.

• There is plenty of water in the plant, and it is nighttime.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-1

Scientists working in space would most likely be studying the effects of what kind of stimuli on plant growth?

• temperature

• radiation

• oxygen

• gravity

Tags

NGSS.MS-LS1-5

What stimulus causes the roots and stems to grow in opposite directions?

• Water

• Temperature

• Gravity

• Light

Tags

NGSS.MS-LS1-5

What stimulus is most likely to cause the stomata to close?

• Carbon dioxide concentration decreasing in the atmosphere

• Carbon dioxide concentration increasing in the atmosphere

• Water volume decreasing in the soil

• Water volume increasing in the soil

Tags

NGSS.HS-LS1-3

On a leaf surface, guard cells that open and close in response to the amount of water available to keep everything balanced is an example of what?

• phototropism

• homeostasis

• respiration

• constructive feedback

Tags

NGSS.MS-LS2-1