Corrections

Question 1

A test was performed on a food substance. A positive result was shown by a colour change to
blue-black.

Answer 1

iodine solution

Question 2

A student drew a diagram to show the substances used and produced in photosynthesis in a leaf. What is produced by the leaf?
CO2
water
Oxygen
Glucose

Answer 2

Glucose and oxygen

Question 3

A student drew a diagram to show the substances used and produced in photosynthesis in a leaf. What is used by the leaf?
CO2
water
Oxygen
Glucos

Answer 3

Co2 and water

Question 4

13 The diagram shows a type of plant cell.
In which tissue is this cell found?

Answer 4

palisade mesophyll

Question 5

The list shows some human health problems.
1 chronic obstructive pulmonary disease
2 constipation
3 coronary heart disease
4 obesity

Which problems can be caused by malnutrition?

Answer 5

2, 3 and 4

Question 6

Mammals have a double circulation.
Which shows the correct sequence for the movement of blood in a mammal in terms of body, heart and lungs?

Answer 6

body → heart → lungs → heart

Question 7

During physical activity, what stimulates the brain to increase the breathing rate?

Answer 7

increased carbon dioxide concentration in the blood

Question 8

How many molecules of ethanol are released from the anaerobic respiration of one molecule of
glucose?

Answer 8

2

Question 9

kidney and its blood vessels. In a healthy person, which structure(s) transport glucose?

Answer 9

artery and vein

Question 10

Which row shows the state of the ciliary muscles and suspensory ligaments, when the eye is
focusing on a near object?

Answer 10

ciliary muscles contract, suspensory ligaments slack