Questions Corrections 2021

Question 1

2 pieces of lab equipment used to prepare cells to view using a microscope

Answer 1

slide
Cover slip

Question 2

Financial impact on the UK economy of an increasing number of obesity

Answer 2

More time of work
So employer have to give financial support

Question 3

What are two products of anaerobic respiration in plant cells

Answer 3

Carbon dioxide
Ethanol

Question 4

On day 10 a pond snail died
Explain why this caused the concentration of carbon dioxide to increase after day 10

Answer 4

Snail is being decayed
By bacteria in the pond water
So respiration of decomposers releases CO2

Question 5

The student investigated the effect of temperature on amylase activity

Describe how the student could extend the investigation to determine the effect of a different factor in amylase activity

Answer 5

Keep temperature constant
Change the different factor such as the pH and test a range of values of the named factor

Question 6

A factor that would decrease the rate of water loss from a plants leaves

Answer 6

Increased humidity

Question 7

Describe the direction of movement of substances in phloem and xylem

Answer 7

Xylem transports unidirectionally
Phloem transports bidirectionally

Question 8

The rate of water loss at midnight was much lower than 12:00
Explain why

Answer 8

Stomata are closed
As there is less light

Question 9

Explain how a low number of a blood component can cause bleeding that will not stop aster the skin is cut

Answer 9

Fewer platelets
So blood does not clot as easily

Question 10

A person has a tumour blocking the tube leading from the gall bladder to the small intestine

Explain why this person would have difficulty digesting fat

Answer 10

Less bile reaches the small intestine
So less emulsification of fat
So smaller surface area of lipase to break down fat
pH of small intestine is not neutralised
So lipase is not at its optimum pH to break down fat