AQA A level Exchange & Transport revision

A high SA:V ratio enables a high...

• Metabolic rate

• Number of offspring

• blood pH

• degree of muscle contraction

What method is used to study the effect of surface area to volume ratio on diffusion?

• Using different size agar blocks containing indicator

• Putting cylinders of potato in different salt concentrations

• putting beetroot tissue in water at different temps

• Squashing cells between two slides and observing

Which organism uses its body surface for gas exchange?

• Human

• Elephant

• Whale

• Single-celled organism

What is the role of the alveoli in the human gas exchange system?

• Transport of oxygen

• Surface over which gas exchange takes place

• Reducing diffusion gradient from blood

• Production of mucus

What equation is used to calculate pulmonary ventilation rate?

• PVR = heart rate × stroke volume

• PVR = oxygen level × carbon dioxide level

• PVR = tidal volume × breathing rate

• PVR = blood pressure × resistance

What is digested by amylases in mammals?

• Proteins

• Lipids

• Nucleic acids

• Carbohydrates

What mechanisms are involved in the absorption of amino acids in the ileum?

• active transport, co-transport and diffusion

• Facilitated diffusion, osmosis and simple diffusion

• Active transport and simple diffusion

• Simple diffusion, osmosis & co-transport

What theory explains water transport in the xylem of plants?

• Osmosis theory

• Mass flow hypothesis

• Diffusion theory

• Cohesion-tension theory

What transports organic substances in plants?

• Root hairs

• Xylem

• Stomata

• Phloem

What is the role of haemoglobin in animals?

• Transport of nutrients

• Transport of oxygen

• Transport of hormones

• Transport of water