paper 1 PPQs Flashcards
includes higher and single content
C
protease
• acidic
reason:
any one from
• produces hydrochloric acid
• optimum for enzyme/protease to act
liver
it increases the surface area of fats
Give one safety precaution a student should take when using Benedict’s solution.
[1 mark]
Benedict’s and iodine tests only
Starch molecules are not absorbed into the blood from the digestive system.
Give one reason why.
[1 mark]
cells contain many chloroplasts
stomata
diffusion
Look at Table 2.
What colour of light should be used to grow plants in a greenhouse?
blue
fungus
Plants with rose black spot disease often have yellow leaves.
Suggest one reason why the leaves are yellow instead of green.
[1 mark]
Explain why plants with yellow leaves grow slowly.
[2 marks]
virus
Malaria is a disease caused by a protist.
How is the malaria pathogen transferred to humans?
[1 mark]
by mosquito bites
drain water from swamps
nucleus
cells never stop dividing
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]
A person with lung cancer can develop secondary cancers in other parts of the body.
Describe how this can happen.
[1 mark]
(cancer cells transported) in the blood
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]
There are no new cases of skin cancer diagnosed in males younger than 15 years of age.
Suggest one reason why.
[1 mark]
Give one conclusion from the data in Figure 6.
[1 mark]
Survival rates for all types of cancers have improved over the last 20 years.
Suggest two reasons why.
[2 marks]
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]
any one from:
• fever
• abdominal/stomach cramps
what is the name of the first antibiotic developed?
[1 mark]
penicillin
The concentration of live bacteria in the body continued to increase after starting the course of antibiotics.
Suggest one reason why.
[1 mark]
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]
C
Suggest why doctors do not give antibiotics to patients with minor infections.
[1 mark]
B
B
D
differentiation
4
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]
46
Compare the growth of boys with the growth of girls.
Use data from Figure 11 in your answer.
[6 marks]
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!
Give one way that cell division by mitosis is important in fully grown animals.
[1 mark]
repair of tissues
or
replacement of cells
