Component 3.2 - Movement if water into and through root Flashcards Preview

Eduqas A level Biology - Year 1 > Component 3.2 - Movement if water into and through root > Flashcards

Flashcards in Component 3.2 - Movement if water into and through root Deck (6)
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1
Q

How is water taken up into plants?

A

Water moves by osmosis from the soil through root hair cells

The soil has a very dilute solution of mineral ions meaning it has a high water potential and the vacuole in the root hair call contains cell sap of ions and sugars lowering water potential.

2
Q

How are root hair cells adapted to their function?

A

The root hair cell has root hairs which increase the surface area massively meaning water can be taken up quickly.

Root hair cells have thin cell walls which decreases the diffusion pathway and increase the rate of water uptake.

3
Q

What is the apoplast pathway?

A

Water moves in the cell walls. Cellulose fibres in the cell wall are separated by spaces through which the water moves.

4
Q

What is the symplast pathway?

A

Water moves through the cytoplasm and plasmodesmata.

5
Q

What is the vacuolar pathway?

A

Where water moves from vacuole to vacuole

6
Q

Why does water move across the root?

A

There is a water potential gradient across the root cortex. It is highest in the root hair cells and lowest in the xylem, so water moves down the water potential gradient, across the root.

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