Daily Practice

GCSE Science

4th December 1986

5 questions · GCSE · 584 questions in this band

1
DNA, Genetics and Inheritance
A man has genotype XY. State his sex, and state which sex chromosomes are found in the sperm cells he produces.
2
Variation, Evolution and Selection
State what is meant by a selection pressure.
3
Ecology
Give one example of a biotic factor that could affect a population of rabbits.
4
Ecosystems, Adaptation and Feeding Relationships
In a grassland food chain, the biomass of grass available is 8400 kg and the biomass transferred to the rabbits that eat it is 940 kg. Calculate the percentage efficiency of biomass transfer from grass to rabbits, to 3 significant figures.
5
Biodiversity, Cycles and Human Impact
Explain why large-scale deforestation increases the concentration of carbon dioxide in the atmosphere.

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