4 marksFoundation4.5.1 Homeostasis
Automatic control systems keep conditions inside the body within narrow limits.
.1Put the parts of a control system in order, starting with the stimulus.
[1 mark] .2What is homeostasis?
[1 mark] .3Which two internal conditions are controlled by homeostasis? Tick two boxes.
[2 marks] 4 marksFoundation4.6.2.1 Variation4.6.2.2 Evolution
Differences in the characteristics of individuals in a population are called variation.
.1Which two characteristics are caused only by the genes a person inherits? Tick two boxes.
[2 marks] .2What is a mutation?
[1 mark] .3Name the process by which organisms best suited to their environment are more likely to survive and breed.
[1 mark] 3 marksFoundation4.6.1.5 Inherited disorders4.6.1.6 Sex determination
Some disorders are inherited. Sex is also determined by inherited chromosomes.
.1Polydactyly causes extra fingers or toes. What causes polydactyly?
[1 mark] .2Cystic fibrosis is a disorder of which part of the cell?
[1 mark] .3Give the sex chromosomes of a human female.
[1 mark] 3 marksFoundation4.7.2.1 Levels of organisation
A food chain on a farm is: grass → rabbit → fox.
.1What is the grass in this food chain?
[1 mark] .2What do the arrows in a food chain show?
[1 mark] .3In a stable community, what usually happens to the fox population after the rabbit population increases?
[1 mark] 3 marksFoundation4.7.3.1 Biodiversity4.7.3.2 Waste management
Human activities affect biodiversity.
.1What is biodiversity?
[1 mark] .2Which two human activities can pollute water? Tick two boxes.
[2 marks] 