Biology 2

Created by: kelz0209
Created on: 13-04-14 17:08

Name two exchange surfaces in humans.

Alveoli and villi.

1 of 9

If there's a low concentration of glucose in the gut and a high concentration in the blood, what process is used to absorb glucose into the blood?

Active transport.

2 of 9

For each of the transport systems, xylem and phloem, answer the following questions:(a) What substances does it transport? (b) From where and to where does it transport these substances?

(a) Xylem-transports water and minerals. Phloem-transports food substances/dissolved sugars. (b) Xylem-from roots to stem and leaves. Phloem-from leaves to growing regions and storage organs.

3 of 9

Name the two processes involved in transpiration.

Evaporation and diffusion.

4 of 9

Where are the main places that a plant; (a) Absorbs water? (b) Loses water?

(a)The roots. (b)The leaves.

5 of 9

The diagram shows a villus from the small intestine. Glucose and other products of digestion are absorbed into the blood through the villi. Describe how the products of digestion move into the blood.

The products of digestion move by diffusion down their concentration gradients into the blood, and by active transport, against their concentration gradient.

6 of 9

Explain, as fully as you can, how the structure of a villus is related to its function.

They increase the surface area to maximise absorption. They have a thin wall/a single layer of surface cells to reduce the distance across which diffusion occurs. They have a good blood supply for the uptake of substances.

7 of 9

The diagram shows a root hair cell. Describe how the structure of a root hair cell is adapted to carry out its function.

It has hair-like shape that sticks out into the soil, creating a larger surface area for diffusion/active transport.

8 of 9

Explain how mineral ions are absorbed into the root hair cell.

The concentration of mineral ions is higher inside the root hair cell than in the soil around it. So mineral ions are absorbed by active transport against a concentration gradient/using energy from respiration.

9 of 9

Other cards in this set

Card 2

Front

If there's a low concentration of glucose in the gut and a high concentration in the blood, what process is used to absorb glucose into the blood?

Back

Active transport.

Card 3

Front

For each of the transport systems, xylem and phloem, answer the following questions:(a) What substances does it transport? (b) From where and to where does it transport these substances?

Back

Card 4

Front

Name the two processes involved in transpiration.

Back

Card 5

Front

Where are the main places that a plant; (a) Absorbs water? (b) Loses water?

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Biology 2