B1-B3 June 2013 Foundation

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B1

1b)Describe how the distribution of malaria might change if the world gets warmer (2)
areas further away from the equator will have malaria cases
 What word is used to describe the fish in this action? (1)
stimulus
Gemma can't pass on hyperhidrosis to her friends. Explain Why (2)
 it is a non-infectious (disease), not caused by a pathogen, non-contagious, it is inherited
The gov is worried that large numbers of people may develop serious diseases. Use data and bilogical knowledge to explain why gov is worried. Include links between conditions tested for and diseases they may cause. Include calculations (6)
-high blood pressure is linked to an increase risk of heart disease
-high blood cholesterol is linked to an increase risk of heart disease
-failure to respond to insulin indicates type2 diabetes
-too much cholesterol in the blood can form plaques in the walls or arteries
-30 000 people in Singapore have all three conditions (or similar calculation).

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B2.1

What is a trophic level? (1)
position of an organism in a food chain/web
Write down one other resource they might compete for (except food) (1)
 water, shelter, places to breed
Explain what would happen to the population of earwigs in this food web if all the millipedes were killed by a disease (2)
(population would decrease)  because the beetle has lost one food source, so will feed more on the earwigs
 Which two of the indicator species hsow characteristics found only in insects (2)
mayfly larva, caddis fly larva
Explain how these adaptations help it survive in fast-flowing streams (hooks and live underneath stones) (2)
hooks: help it anchor / not get swept away
flattened body: allows it to shelter under stones / not get swept away

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B2.2

Should the county council be concerned about levels of pollution downstream from the factory? (6)
-mayfly larvae only live in unpolluted water high in oxygen content
-rat-tail maggots can survive very low oxygen content
-allow there are mayfly in unpolluted areas so downstream of factory must be polluted
-allow higher level responses to Biochemical Oxygen Demand (BOD) being very high in polluted water
Explain the change in numbers of right whales found in the area of the North Atlantic between August and October (2)
August to September: an increase in food causes an increase in whales, September to October: an decrease in food causes a decrease in whales
Suggest why the right whales are in danger of becoming extinct in their current environment (2)
less food, hunting, pollution

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B3.1

Put one tick in each row of the table to show which cells are haploid and which are diploid (2)
H,H,D,D,D
Which type of cell division happens to the zygote to form the embryo? (1)
mitosis
What is meant by cell differentiation? (1)
cells become specialised
Have the girls and boys stopped growing in height after 20 years? (2)
girls – (yes) because graph has levelled off / stopped growing at 17/18, boys – (no) because graph has not levelled off / is still rising
Write down two types of protein that do different jobs and describe the job of each protein during growth (4)
structural proteins-build new tissue / named tissue e.g. skin
hormones-control growth / control body processes / control named process e.g. puberty
carrier molecules / eg haemoglobin-transport materials (needed for growth)
enzymes / catalysts-control chemical reactions (involved in growth)

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B3.2

Describe how selective breeding was used to produce bulldogs (6)
-select dogs with the biggest heads and flattest faces
-breed these together
-from the offspring select those with the biggest heads and flattest faces
-repeat this over many generations.
Write about whether breeding bulldogs should be banned or not (2)
(reason for banning breeding:)  unnatural / unethical / cruel to animals
(reason against banning breeding:) breeders should be able to do so if they wish, health problems can be treated, breeding could be used to get rid of harmful features

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