Plant Homeostasis

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

What is turgor pressure and what happens without it?

• pressure exerted by water inside the cell pushing against the cell wall

• pressure of the outside of the cell wall

• no pressure at all

• pressure exerted by gravity

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 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

The process by which an organism’s internal environment is kept stable in spite of changes in the external environment.

• Positive Feedback

• Negative Feedback

• Homeostasis

• Targeted Cells

A feedback loop best fits which characteristic of life?

• Cells

• Organization

• Homeostasis

• Adaptation

Maintaining a stable internal

environment is called

• homeostasis

• equilibrium

• balance

• evenness

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

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.MS-LS2-1

What process causes a plant to wilt in response to too much or too little water?

• Dehydration

• Transpiration

• Respiration

• Photosynthesis

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1