Ecology AQA GCSE Biology

Calculate the percentage of energy used for growth. Write the number only - to 2 s.f

Cows are reared for meat production.

The cows can be reared indoors in heated barns, or outdoors in grassy fields.

The table shows energy inputs and energy outputs for both methods of rearing cows. The percentage efficiency for rearing cows outdoors is 0.03%

Calculate the energy output value X. WRITE THE NUMBER ONLY (2sf).

 What does ‘biodiversity in a river’ mean?

• The variety of species of animals in the river.

• The variety of species of organisms in the river.

• The variety of species of plants in the river.

Potato blight is a disease of potato plants.

Potato blight is caused by the fungus Phytophthora infestans. The fungus grows near the surface of the potato.

How does growing near the surface help the fungus to respire?

• The fungus can get nitrogen from the soil.

• The fungus can get oxygen from the air.

• The fungus can get water from the potato.

Name process X.

The percentage efficiency for rearing cows outdoors is 0.03%

Calculate how many times more efficient it is to rear cows indoors than to rear cows outdoors. (3 sf)

Dead plant material can be decayed in a biogas generator.

Figure 2 shows the percentages of the gases found in a sample of biogas.  Gas X is the main fuel gas found in the biogas.

What is gas X?

• Carbon monoxide

• Hydrogen

• Methane

• Nitrogen

Which term describes organisms that can tolerate very hot or very cold places? (use one word)

What is the trophic level of the dog?

• 1

• 2

• 3

The diagram shows the annual flow of energy through a habitat.

The figures are in kJ m^–2. Calculate the percentage of the energy in sunlight that was transferred into energy in the green plants.