Edexcel GCSE Biology Topic 8 Exchange and transport in animals overview quiz quiz

It has a small surface area to volume ratio, so diffusion alone cannot supply its needs at all

It does not need any substances from its surroundings to survive and grow inside its cells

It has a large surface area to volume ratio, so diffusion across its surface is fast enough

It has its own set of tiny lungs to take in the oxygen it needs

Thick walls several cells thick to deliberately slow down diffusion

A small surface area so that less gas can be exchanged at once

A poor blood supply that lets carbon dioxide build up nearby

Thin walls one cell thick, giving a short diffusion distance

A larger surface area

A smaller surface area

A longer diffusion distance

A smaller concentration difference

It has a large central nucleus that helps it to bind and hold oxygen tightly

It is packed with haemoglobin and has no nucleus, with a biconcave shape

It contains many chloroplasts to capture oxygen from the blood

It is cube-shaped to pack closely together inside the vessels

To carry oxygen around the body

To fight off invading pathogens

To help the blood clot at a wound

To carry dissolved hormones in the plasma

Arteries carry blood towards the heart; veins away from it

Both carry blood away from the heart

Both carry blood towards the heart

Arteries carry blood away from the heart; veins towards it

It pumps blood to the whole body at higher pressure

It only pumps blood the short distance to the lungs

It holds far more red blood cells than the right does

It sits closer to the lungs and so works much harder

150 cm3 per minute

5600 cm3 per minute

1.14 cm3 per minute

560 cm3 per minute

It is an endothermic reaction that only ever happens inside plant cells

It is exactly the same process as breathing air in and out of the lungs

It is exothermic and happens continuously in all living cells

It only happens during exercise when the muscles are working hard

Carbon dioxide and water

Ethanol and carbon dioxide

Glucose and oxygen

Lactic acid

Aerobic respiration

Anaerobic respiration

They release the same amount

Neither releases energy

To provide a steady supply of food for the organisms throughout the whole experiment

To absorb the carbon dioxide they release so the pressure falls as oxygen is used

To add extra oxygen into the tube so the organisms can keep respiring

To keep the organisms warm so that their rate of respiration stays high