BIOLOGY PAPER1 (NO. 1)

Which structure is present in a liver cell and in a leaf cell?

By which process does water vapour pass out of a leaf?

A student takes a potato and cuts three pieces from it. Each piece is 5 cm × 0.5 cm × 0.5 cm. He
places the three potato pieces into three different concentrations of sugar solution.
After two hours, he removes the potato pieces from the sugar solutions and measures their
lengths.
The results are shown in the table.

What can be concluded from these results?

Which property of enzymes is explained by the lock and key hypothesis?

The diagram shows a transverse section through a leaf.

What are the functions of the parts labelled 1, 2, 3 and 4?

The diagram shows a green plant photosynthesising under a glass jar. This was used as a
control experiment in a laboratory investigation.

Which diagram shows the experiment carried out to investigate the need for carbon dioxide in
photosynthesis?

The graph shows the rate of photosynthesis in a plant in full sunlight at two different temperatures
and different concentrations of carbon dioxide.

At normal atmospheric carbon dioxide concentrations, what limits the rate of photosynthesis?

Which organ produces an acid which kills the bacteria in ingested food?

A patient has her gall bladder surgically removed.
How will this affect the functioning of her body?

Four of the organs of the alimentary canal are listed.
J
colon
K
duodenum
L
oesophagus
M
stomach
Which sequence shows the order in which food passes through these organs?

Which feature of root hairs suggests that they take up ions from the soil by active transport?

The photomicrograph shows part of a section through a root.

The contents of Y are tested with Benedict’s solution and with iodine solution.
Which results are expected?

Which blood vessels carry blood to the liver?

Which chamber of the heart would be the first to receive nicotine absorbed into the blood in the
lungs of a cigarette smoker?

Which blood vessels contain valves?

Which word equation represents aerobic respiration?

What lines the walls of alveoli?

The graph shows changes in the volume of a person’s lungs over a period of two minutes.

What could cause the change in the pattern of the graph between X and Y?

The diagram shows a kidney and blood vessels associated with it.

Which statements are correct?
1
Vessel X contains more urea than vessel Y.
2
Vessel Y contains urine.
3
Vessel X contains more oxygen than vessel Y.

Which of these statements describes control by negative feedback?

Which statements describe the pupil reflex in bright light?
1
ciliary muscles contract
2
ciliary muscles relax
3
circular iris muscles contract
4
circular iris muscles relax
5
lens becomes rounder
6
lens becomes thinner
7
pupil constricts
8
pupil dilates
9
radial iris muscles contract
10 radial iris muscles relax

Which chemical produced by the body alters the activity of a target organ and is destroyed by the
liver?

The diagram shows a section through the human brain.
Which labelled part contains the temperature regulation centre?

Which statements about the elbow joint are correct?
1
When the biceps muscle contracts, the elbow is bent.
2
When the triceps muscle relaxes, the elbow is straightened.
3
Skeletal muscles work in antagonistic pairs.

What are the effects of heroin?

Which process, brought about by microorganisms, does not depend on anaerobic respiration?

The diagram shows the equipment used in the industrial production of penicillin.

What is the purpose of the structure labelled X?

The flow of energy in ecosystems is non-cyclical.
What is the main reason for this?

The diagram shows a food chain.

Which pyramid of numbers would represent this food chain?

The diagram shows parts of the nitrogen cycle.
Which arrow represents the action of the root nodule bacteria of leguminous plants?

Which row matches a method of controlling malaria with the explanation of how this method
works?

Areas of tropical rainforests are often cut down and cleared. After cutting down the trees, the
areas are normally burnt.
What are the effects of this activity?

The diagram shows a section of a seed.

What are the numbered parts?

What identifies a cause, a symptom and a treatment for syphilis in humans?

Which processes involve parts of the carpel of a flower?

The diagram shows the female reproductive system.

In which parts are the eggs and the zygote formed?

Natural selection plays a role in evolution.
What describes features of natural selection that can affect evolution?

In guinea-pigs, the allele for black fur (B) is dominant to the allele for brown fur (b). A breeder can
sell a brown guinea-pig for more money than a black guinea-pig.
Which cross will produce the most money?

The inheritance of the ABO blood groups in humans is controlled by three alleles (IA, IB and IO),
only two of which can be present in one individual.
What are the possible blood groups of children born to a homozygous group A woman and a
heterozygous group B man?

Which statement is always true of dominant alleles?