B3 - Gas and Solute Exchange Flashcards

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1
Q

What substances are involved in respiration and what do they do?

A

Glucose and oxygen move in and out of cells.

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2
Q

What do exchange surfaces do?

A

Allow enough of a substance through.

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3
Q

What are the 4 factors of a good exchange surface and how do they help?

A

Thin: shorter diffusion distance.Large surface area: lots at once.Blood vessels: in/out of blood quickly.Ventilated.

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4
Q

Do bigger organisms find it easier or harder to exchange substances and why?

A

Harder, because they’re more spread out and further apart.

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5
Q

How does diffusion work in a plant?

A

It diffuses into air spaces in the underside of the leaves through the stomata. It then diffuses into cells for photosynthesis.

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6
Q

What are the role of stomata?

A

They let water vapour and oxygen out.

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7
Q

What are the role of guard cells?

A

They control the stomata size.

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8
Q

What would happen if plants didn’t have guard cells?

A

They would wilt.

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9
Q

What happens if a plant is losing too much water?

A

The guard cells will close.

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10
Q

What sort of shape do leaves have and why does this help?

A

They have a flattened shape which increases their area, making them more effective.

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11
Q

What does photosynthesis need in regards to substances?

A

CO2 and water in cells.

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