Exchanges of Substances with the Environment Random Retrieval

This quiz contains all the questions in the Exchanges of Substances with the Environment section. The website will pick 20 questions at random.

1 / 20

The Mass Flow Hypothesis, is the best explanation for translocation in plants. What does it suggest happens at 'sources'?

Substances move by diffusion from a high concentration where they are made, to a lower concentration in the phloem.

Substances are actively transported out of the source cell into the phloem, reducing the water potential in the phloem.

Substances are stored, reducing the concentration in the source, creating a concentration gradient.

2 / 20

What term is used to describe the 'sticking' together of water molecules?

Cohesion

Tension

Mass Flow

3 / 20

What is a Thrombosis?

A blood clot that forms in the lumen when the lining of an artery becomes damaged.

A blood clot that forms under the endothelium when an artery becomes damaged.

Swelling caused by highblood pressure.

4 / 20

What is an Atheroma?

A build up of plaque in the lumen of arterioles and arteries.

A build up of plaque under the endothelial lining of arteries and arterioles.

A blood clot that forms in the lumen when the lining of an artery becomes damaged.

5 / 20

What has happened at position B?

The Atrioventricular valves open.

The Semi- Lunar valves close.

The Semi- Lunar valves open.

6 / 20

What happens during Ventricular Systole?

Atrial wall is relaxed, but the ventricular wall is contracted. The Atrioventricular valve is closed, but the Semi Lunar valve is open.

Atrial wall is relaxed, but the ventricular wall is contracted. The Atrioventricular valve is open, but the Semi Lunar valves are closed.

Atrial and ventricular walls are contracted, and the Atrioventricular valve is closed. The Semi Lunar valves are open.

7 / 20

This bar chart shows the risk of CVD with differing amounts of cigarettes smoked per day. Is there a significant difference in risk between smoking no cigarettes, and smoking 1 - 19 cigarettes a day?

Yes

No

8 / 20

Does this bar cart show a correlation between number of cigarettes smoked, and the risk of CVD?

Yes

No

9 / 20

Which type of blood vessel has the thickest muscular layer?

Vein

Arterioles

Artery

10 / 20

Once blood leaves arteries, which type of blood vessel will it enter?

Veins

Arterioles

Capillaries

11 / 20

Why do the guard cells become 'curved' when they swell up?

Because the water fills them up.

Because the cell wall next to the stoma is thicker.

Because the internal cytoskeleton bends.

12 / 20

How does water move into the guard cells?

Translocation

Transpiration

Osmosis

13 / 20

Oxygen diffuses out of the tracheoles directly into what?

Respiring body cells.

The insect's open circulatory system.

Air Sacs.

14 / 20

Which letter is the tracheae?

A

B

C

D

15 / 20

The diagram shows an insect respiratory system. Which letter represents the tracheoles?

A

B

C

D

16 / 20

Sufferers of emphysema also have reduced elastin in the alveolar walls. What effect does this have on breathing?

Alveoli can't stretch so there is a reduced volume on inhalation.

Causes an increase in surface area due to 'baggy' alveolar walls.

Reduced Elastic recoil, so problems with exhaling.

Shorter diffusion pathway due to thinner walls.

17 / 20

Forced Expiratory Volume (FEV) is the maximum volume of air that can be breathed out in 1 second. What is the FEV for person B?

0.5dm³

1.5 dm³

1 dm³

2 dm³

18 / 20

Other than surface area to volume ratio, which is an example of a physiological adaptation, which allows an animal to live at hotter temperatures?

Small surface area:volume ratio.

Thicker hair.

Thicker layer of blubber or fat.

More water reabsorbed by the kidneys to reduce water loss.

19 / 20

What is the volume of the same roughly spherical spongy mesophyll cell with a diameter of 80 µm, using the formula Volume=4/3 pi r ³?

2,144,661 µm³

2,144,660µm³

268,082 µm³

268,083 µm³

20 / 20

If we assume a spongy mesophyll cell is approximately a sphere. Using the formula 4 pi r ² , what is its surface area if its diameter is 80 µm?

80,425 µm ²

20,106 µm ²

5,027 µm²

10,054 µm²

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