Paper 2, Higher

Explain why the rate of photosynthesis levels off at high light intensity.

In a potometer, the air bubble moved 5.4 cm in 15 minutes. The capillary tube has a radius of 0.5 mm. Calculate the rate of water uptake in mm³ per minute.

Describe an investigation into the effect of light on the growth of seedlings.

Describe the roles of FSH, LH and oestrogen in the menstrual cycle.

Explain how the body responds to a fall in core body temperature.

Explain how ADH helps to control the water content of the blood.

A person's stroke volume is 70 cm³ and heart rate is 72 beats per minute. Calculate their cardiac output.

Write the word equation for anaerobic respiration in yeast.

Describe the food tests for starch, sugars and protein.

Explain how a polar bear is adapted to survive in the Arctic.

Describe how to use a transect to investigate how the distribution of a plant species changes from a hedge into a field.

Producers in a food chain contain 2500 kJ of energy per m². Primary consumers contain 225 kJ per m². Calculate the efficiency of transfer and give two reasons why it is not 100%.

Explain how deforestation increases the concentration of carbon dioxide in the atmosphere.

Explain how mycoprotein is produced and why it is a sustainable food.

Explain three ways plants use the glucose produced by photosynthesis.

Explain how guard cells control water loss from a leaf.

Evaluate hormonal and non-hormonal methods of contraception.

A person's stroke volume is 95 cm³ and heart rate is 150 beats per minute. Calculate their cardiac output.

Define metabolism and give two examples of metabolic reactions.

Describe where carbohydrases, proteases and lipases are produced in the digestive system, and name the products of their digestion.

Explain how predator and prey populations change in cycles.

Explain why quadrats should be placed randomly.

Producers in a food chain contain 12000 kJ of energy per m². Primary consumers contain 1440 kJ per m². Calculate the efficiency of transfer and give two reasons why it is not 100%.

Describe four biological consequences of global warming.

Explain why factory farming increases the efficiency of food production and one ethical objection.

The light intensity at 10 cm from a lamp is I. Calculate the relative light intensity at 20 cm.

Compare transport in xylem and phloem.

Explain the role of adrenaline in the 'fight or flight' response.

Explain how an artificial pacemaker helps a person with an irregular heartbeat.

Where does aerobic respiration mainly take place?

Which organ produces bile?

Describe how extremophiles are adapted to their environments.