Different species in a habitat may depend on each other for food - AQA - GCSE Biology - Question 3 - 2023 - Paper 2
Question 3
Different species in a habitat may depend on each other for food.
Figure 3 shows a food chain.
The grass needs energy to grow.
What is the source for the grass?
T... show full transcript
Worked Solution & Example Answer:Different species in a habitat may depend on each other for food - AQA - GCSE Biology - Question 3 - 2023 - Paper 2
Step 1
What is the source for the grass?
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Answer
The source of energy for the grass is sunlight.
Step 2
Write the name of one organism from Figure 3 in each box in Table 2.
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Answer
Feeding relationship
Organism
Secondary consumer
Lynx
Primary consumer
Snowshoe hare
Producer
Grass
Herbivore
Snowshoe hare
Carnivore
Lynx
Prey
Snowshoe hare
Predator
Lynx
Step 3
Explain how the different fur colour increases the chance of survival of the snowshoe hare.
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Answer
The snowshoe hare's fur color changes with the seasons; it is brown in summer and white in winter. This adaptation helps it camouflage with its environment. In summer, the brown fur blends into the dried plants, making it harder for predators, like lynx, to spot them. In winter, the white fur matches the snow, providing concealment from hunting predators, increasing the hare's chances of survival.
Step 4
Write two reasons why the number of snowshoe hares increases.
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Answer
The snowshoe hare may have fewer predators in the area, leading to an increase in their population.
There is an abundance of food (grass) available, which allows for higher reproduction rates among hares.
Step 5
What effect does an increase in the number of snowshoe hares have on the number of lynx?
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Answer
An increase in the number of snowshoe hares leads to an increase in the number of lynx, as there is more food available for the lynx to feed on.
Step 6
Suggest one reason why the number of lynx decreased from 1915 to 1919.
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Answer
The number of lynx may have decreased due to a decline in the snowshoe hare population, resulting in insufficient food resources for the lynx.
Step 7
Give two ways the biomass is lost.
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Answer
Biomass is lost through respiration, resulting in carbon dioxide being released.
Biomass is excreted as waste in the form of feces or urine, which contains undigested materials.
