In a pond, frogs eat insects and herons eat frogs. A disease kills most of the frogs.
.1
Explain what is likely to happen to the number of insects in the pond.
[2 marks]
.2
Explain why the heron population may also decrease.
[2 marks]
.3
Give two resources that animals compete for.
[2 marks]
3 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
Evolution is a change in the inherited characteristics of a population over time through natural selection.
.1
Put the stages of natural selection in order, starting with the first.
[2 marks]
.2
Define the term species.
[1 mark]
6 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
White blood cells help to defend the body against pathogens.
.1
What are the molecules on the surface of a pathogen that white blood cells recognise as foreign?
[1 mark]
.2
Describe three ways white blood cells defend the body against pathogens.
[3 marks]
.3
A person has antibodies against the measles virus. These antibodies do not protect the person against the mumps virus.
Explain why.
[2 marks]
5 marksFoundation
Spec and skills
Original practice question
Answer and supported method checks
A student estimated the number of daisies in a field 50 m long and 40 m wide. She placed a 0.25 m² quadrat at five random positions and counted the daisies in each.
Daisies in five quadrats: 4, 7, 0, 5, 9.
Quadrat
1
2
3
4
5
Number of daisies
4
7
0
5
9
.1
Calculate the mean number of daisies per quadrat.
[2 marks]
.2
Estimate the number of daisies in the whole field.
[3 marks]
3 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A couple already have three daughters. They are expecting a fourth child.
.1
Give the probability that the fourth child will be a boy.
[1 mark]
.2
Explain why the chance of any baby being a boy is 50%.
