Daily Practice

GCSE Science

25th January 1990

5 questions · GCSE · 584 questions in this band

1
DNA, Genetics and Inheritance
State whether cystic fibrosis is caused by a dominant or a recessive allele.
2
Variation, Evolution and Selection
Give one example of variation that is caused purely by the environment rather than by genes.
3
Ecology
Define community, in ecological terms.
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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