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Iza Rehman




Additional Biology Past Exam Paper Questions
Enzymes are used in biological detergents. Name the type of enzyme that digests stains
containing starch.
Lipase
A new detergent is marketed as being `environmentally-friendly'. Scientists compared the
performance of this new detergent with an existing detergent. They measured the time
taken…

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Iza Rehman




Inherited
2 recessive alleles that contained the disease
Cystic Fibrosis
From both her parents
Bob and Carol
Explain why Ted did not inherit Cystic Fibrosis.
Inherited dominant gene from Carol, Mother
Suggest one reason why many people support the screening of embryos for the cystic
fibrosis allele.
Reduces…

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Iza Rehman




Battery chickens produce more eggs per year than free range chickens. Suggest one reason
why.
Less movement
Less heat loss
More feeding
Selective breeding
The animals that we raise for food are usually herbivores (plant eaters) rather than carnivores
(flesh eaters). Explain why.
Less steps in food chain…

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Iza Rehman




Child gets 17 19 22 24 from mother
Child gets 18 20 21 23 from B
No lines from man A correspond to child
Only half the bars of the child's DNA fingerprint match the mother's DNA fingerprint. Explain
why.
Eggs
Contain only half of mothers genetic information…

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Iza Rehman




Conclusion justified by argument
Changing the conditions in which plants grow affects how fast they grow. The diagram shows a
propagator in which scientists can control temperature, light intensity, and carbon dioxide
concentration.


The graph shows the effects of changing the temperature, light intensity and carbon dioxide
concentration…

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Iza Rehman




Nitrate deficiency ­ Stunted growth
Magnesium function ­ Produce chlorophyll
Magnesium deficiency ­ yellow leaves




Tuna fish are carnivores. In the wild they feed on smaller fish called herring. Herring
feed on plankton. Tuna can be attacked by parasitic worms which feed on their flesh. In the
space…

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Iza Rehman




Young tuna are caught by fish farmers and reared in large pens in the sea. The fish are fed
more food than they would normally catch themselves so they grow quickly. When they
reach 400 kg they are sold. The graph on the opposite page shows the effect…

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Iza Rehman




Which letter A, B, C or D represents respiration and photosynthesis.
Respiration = D
Photosynthesis = A
Decay occurs more quickly if the container has holes in the sides. Explain why.
Oxygen can enter
For aerobic respiration
Spreading compost on the soil between plants leads to better growth…

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Iza Rehman




The diagram shows a representative sample of seeds produced by second generation plants.




Describe how the student could obtain a sample that is representative of seeds produced by
the second generation.
Random selection
What was the approximate ratio of yellow seeds to green seeds in the seeds produced…

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Iza Rehman




Protease
Lipase
Diabetes may be caused by a lack of insulin. Part of the treatment for someone with
diabetes is to pay careful attention to the diet. Give one symptom of diabetes.
High blood pressure
Cannot control blood sugar
Give one way in which a diabetic may be…

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