10 Ecology quiz

Which of the following statements about the food chain below is/are true?

A -> B -> C -> D

1. A decrease in population C is inevitable if the habitat of population B is destroyed by human activities.

2. Organism B needs to consume more food than organism D as it is not a meat-eater.

3. An increase in population D is only possible if population C remains stagnant.

4. The population of C will increase if the birth rate of organism B increases.

• 1 and 2 only

• 1 and 4 only

• 2 only

• 2 and 3 only

Which events in a country would directly increase its carbon sink?

1. An active enforcement of its reforestation laws

2. An increase in the percentage of its human population becoming vegetarian

3. The reduction of fossil fuel mining on its land

4. The reduction in the use of harmful pesticides on its farmland

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

• 3 and 4 only

Which of the following is not caused by deforestation?

• Desertification

• Eutrophication

• Flooding

• Soil erosion

Where do plants get the energy to make food?

• Carbon dioxide

• Chlorophyll

• The Sun

• Water

Which organism in the following food chain has the largest population?

Phytoplankton -> krill -> sardine -> tuna

• Krill

• Phytoplankton

• Sardine

• Tuna

Refer to the food web below. How many tertiary consumers are there in the food web?

• 1

• 2

• 3

• 4

The figure shows a pyramid of biomass constructed based on a food chain in the rainforest. Which of the following is true?

• The fresh leaves have the greatest biomass.

• The sparrowhawks have the greatest biomass.

• The slugs have a greater biomass than the fresh leaves.

• The thrushes have less biomass than the sparrowhawks.

Which of these processes in the carbon cycle releases carbon dioxide into the atmosphere?

• Evaporation

• Photosynthesis

• Respiration

• Transpiration

Refer to the food chain below.

Tree -> aphid -> ladybird -> sparrow

What would happen to the other populations if the ladybird population increases?

• The tree population will decrease.

• The aphid population will increase.

• The sparrow population will increase.

• There will be no change in the size of the sparrow population.

Which of the following is true about the number of organisms in the following food chain? Phytoplankton ->jellyfish -> herring -> shark

• The number of sharks is greater than the number of herrings.

• The number of herrings is greater than the number of jellyfish.

• The number of jellyfish is greater than the number of herrings.

• The number of jellyfish is greater than the number of phytoplankton.