Biology Edexcel A Level Assessement Exam With All Correct Answers 2024.

4.1: Explain how the variety of species has generally increased over time. - Answer Variety of life has become more extensive because species adapted to all environments in the world- even extreme habitats. 4.2: Explain the negative impact that some human activities (give 3 examples) have on diversity of species. - Answer -Deforestation/loss of habitat leads to decrease in species richness -Whole ecosystems are affected when species rapidly decline -Leading to extinction or imbalance in a habitat (deforestation, pollution, ozone damage) 4.3: Define the following terms and give a named example of each: species, community, population, habitat, niche, environment, inter-specific completion, intra-specific competition. - Answer -Species: group of organisms which produce fertile offspring, and are reproductively isolated from other species, e.g.: Great Panda -Community: all the living organisms present in an area, e.g.: squirrels, birds, worms, etc. in a forest -Population: a group of interbreeding individuals belonging to one species -Habitat: particular place where a community is found with specific conditions -Niche: the role an organism plays in its environment (how it lives/fits in) -Environment: external surroundings (biotic and abiotic) -Inter-specific Competition: between different species -Intra-specific Competition: between the same species 4.4: Explain what is meant by the term "behavioral adaptations" to the environment, and give an example. - Answer Any actions by an organism that help them to survive or reproduce, e.g.: grey squirrels bury acorns to act as larders in times of food shortages.