iGCSE Biology 4a: Food chains and pyramids

What is the name of the pyramid that shows the number of organisms at each trophic level in an ecosystem?

• Pyramid of numbers

• Pyramid of biomass

• Pyramid of energy

• Pyramid of nutrients

What is the name of the pyramid that shows the total dry mass of organisms at each trophic level in an ecosystem?

• Pyramid of numbers

• Pyramid of biomass

• Pyramid of energy

• Pyramid of nutrients

What is the name of the pyramid that shows the amount of energy available at each trophic level in an ecosystem?

• Pyramid of numbers

• Pyramid of biomass

• Pyramid of energy

• Pyramid of nutrients

Which two pyramids are typically upright, pyramid shapes?

• Number & Biomass

• Number & Energy

• Biomass & Energy

Which feeding level are always represented at the bottom of an ecological pyramid?

• Producers

• Primary consumers

• Secondary consumers

• Tertiary consumers

The arrows in a food chain represent:

• Mass transfer

• Heat transfer

• Nutrient transfer

• Energy transfer

Each food chain has feeding levels known as:

• Tropical levels

• Trophic levels

• Traffic levels

• Typical levels

What is the approximate percentage of energy transfered between trophic levels?

• 1%

• 5%

• 10%

• 15%

Energy is lost between feeding levels due to:

• Insolation

• Insulation

• Respiration

• Photosynthesis

Which level in a food chain performs photosynthesis

• Producers

• Primary consumers

• Secondary consumers

• Tertiary consumers