Biological Sciences Level 7 Pre-Test (2A) Quiz

Which of the following best describes the flow of energy in an ecosystem?

• Energy flows in a circular pattern.

• Energy flows in a one-way direction from producers to consumers.

• Energy is recycled by decomposers.

• Energy is created by consumers.

What is the primary source of energy for most ecosystems?

• The Moon

• The Earth's core

• The Sun

• Chemical reactions

In a food web, which of the following organisms is most likely to be a producer?

• Lion

• Grass

• Eagle

• Mushroom

Which of the following is an example of an abiotic factor in an ecosystem?

• Plants

• Animals

• Temperature

• Bacteria

How might habitat loss affect a population in an ecosystem?

• It will increase the population size.

• It will have no effect on the population.

• It will decrease the population size.

• It will cause the population to become more diverse.

What is a food pyramid used to represent in an ecosystem?

• The number of species in an ecosystem.

• The flow of energy through different trophic levels.

• The migration patterns of animals.

• The amount of water in an ecosystem.

Which of the following is a biotic factor that could affect a population in an ecosystem?

• Soil pH

• Water availability

• Predation

• Temperature

How can climate change impact an ecosystem?

• It can stabilise the ecosystem.

• It can lead to the extinction of species.

• It has no impact on ecosystems.

• It can only affect marine ecosystems.

What happens to the energy that is not transferred to the next trophic level in a food pyramid?

• It is destroyed.

• It is stored in the organisms.

• It is lost as heat.

• It is converted into water.

Which of the following could be a consequence of introducing a new species into an ecosystem?

• Increased biodiversity without any negative effects.

• No change in the existing populations.

• Disruption of the existing food web.

• Immediate extinction of all native species.