paper 1 PPQs

Question 1

Answer 1

C

Question 2

Answer 2

protease

Question 3

Answer 3

• acidic

reason:
any one from
• produces hydrochloric acid
• optimum for enzyme/protease to act

Question 4

Answer 4

liver

Question 5

Answer 5

it increases the surface area of fats

Question 6

Answer 6

Question 7

Give one safety precaution a student should take when using Benedict’s solution.

[1 mark]

Answer 7

Question 8

Answer 8

Benedict’s and iodine tests only

Question 9

Starch molecules are not absorbed into the blood from the digestive system.
Give one reason why.

[1 mark]

Answer 9

Question 10

Answer 10

cells contain many chloroplasts

Question 11

Answer 11

stomata

Question 12

Answer 12

Question 13

Answer 13

diffusion

Question 14

Answer 14

Question 15

Answer 15

Question 16

Answer 16

Question 17

Look at Table 2.
What colour of light should be used to grow plants in a greenhouse?

Answer 17

blue

Question 18

Answer 18

fungus

Question 19

Plants with rose black spot disease often have yellow leaves.
Suggest one reason why the leaves are yellow instead of green.

[1 mark]

Answer 19

Question 20

Explain why plants with yellow leaves grow slowly.

[2 marks]

Answer 20

Question 21

Answer 21

Question 22

Answer 22

virus

Question 23

Malaria is a disease caused by a protist.
How is the malaria pathogen transferred to humans?

[1 mark]

Answer 23

by mosquito bites

Question 24

Answer 24

drain water from swamps

Question 25

Answer 25

nucleus

Question 26

Answer 26

cells never stop dividing

Question 27

Cigarette smoking has been linked to many different types of cancer. Lung cancer is the most common type of cancer caused by smoking. Suggest one reason why. [1 mark]

Answer 27

Question 28

A person with lung cancer can develop secondary cancers in other parts of the body. Describe how this can happen. [1 mark]

Answer 28

(cancer cells transported) in the blood

Question 29

Sometimes a person may need a lung transplant. The National Health Service (NHS) will not offer a lung transplant to a person who smokes. Suggest one reason why. [1 mark]

Answer 29

Question 30

There are no new cases of skin cancer diagnosed in males younger than 15 years of age. Suggest one reason why. [1 mark]

Answer 30

Question 31

Give one conclusion from the data in Figure 6. [1 mark]

Answer 31

Question 32

Survival rates for all types of cancers have improved over the last 20 years. Suggest two reasons why. [2 marks]

Answer 32

Question 33

Answer 33

Question 34

Salmonella food poisoning is caused by bacteria in food. Give one symptom of salmonella food poisoning. Do not refer to vomiting or diarrhoea in your answer. [1 mark]

Answer 34

any one from: • fever • abdominal/stomach cramps

Question 35

what is the name of the first antibiotic developed? [1 mark]

Answer 35

penicillin

Question 36

The concentration of live bacteria in the body continued to increase after starting the course of antibiotics. Suggest one reason why. [1 mark]

Answer 36

Question 37

After 3 days of taking the antibiotic: • the child felt better • there were still bacteria in the child's body. Why did the child feel better? (A) Bacteria had become immune to the antibiotic. (B) The child had become resistant to the bacteria. (C) There were fewer toxins in the body than at day 0 [1 mark]

Answer 37

C

Question 38

Suggest why doctors do not give antibiotics to patients with minor infections. [1 mark]

Answer 38

Question 39

Answer 39

B

Question 40

Answer 40

B

Question 41

Answer 41

D

Question 42

Answer 42

Question 43

Answer 43

differentiation

Question 44

Answer 44

4

Question 45

In humans a fertilised egg cell contains 23 pairs of chromosomes. How many chromosomes will there be in each of the embryo cells? [1 mark]

Answer 45

46

Question 46

Answer 46

Question 47

Compare the growth of boys with the growth of girls. Use data from Figure 11 in your answer. [6 marks]

Answer 47

**INDICATIVE CONTENT ONLY** you don’t need to say every single point for 6 marks!! making 3-4 points **and** quoting the data for each point should be more than enough!

Question 48

Give one way that cell division by mitosis is important in fully grown animals. [1 mark]

Answer 48

repair of tissues **or** replacement of cells