Biology Questions

How do keystone species affect the ecosystem?

• They have little to no impact on the ecosystem.

• They are the most abundant species in the ecosystem.

• They play a critical role in maintaining the stability of an ecosystem.

• They are always the top predators in the ecosystem.

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What is a producer and where does it belong on the trophic pyramid?

• A producer is an organism that makes its own food and it belongs at the base of the trophic pyramid.

• A producer is an organism that consumes other organisms and it belongs at the top of the trophic pyramid.

• A producer is an organism that decomposes organic material and it belongs in the middle of the trophic pyramid.

• A producer is an organism that scavenges for food and it belongs at the second level of the trophic pyramid.

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What is a primary consumer and where does it belong on the trophic pyramid?

• A primary consumer is an organism that feeds on primary producers and it belongs to the second level of the trophic pyramid.

• A primary consumer is an organism that feeds on secondary consumers and it belongs to the third level of the trophic pyramid.

• A primary consumer is an organism that feeds on tertiary consumers and it belongs to the fourth level of the trophic pyramid.

• A primary consumer is an organism that feeds on decomposers and it belongs to the first level of the trophic pyramid.

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What is a secondary consumer and where does it belong on the trophic pyramid?

• A secondary consumer is an organism that primarily feeds on primary producers and belongs to the first trophic level.

• A secondary consumer is an organism that primarily feeds on primary consumers and belongs to the third trophic level.

• A secondary consumer is an organism that primarily feeds on secondary consumers and belongs to the third trophic level.

• A secondary consumer is an organism that primarily feeds on tertiary consumers and belongs to the fourth trophic level.

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What is a decomposer?

• An organism that breaks down dead or decaying organisms

• A type of plant that produces its own food

• An animal that hunts and eats other animals

• A microorganism that causes diseases

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What energy drives photosynthesis?

• Solar energy

• Chemical energy

• Mechanical energy

• Nuclear energy

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How does aerobic and anaerobic respiration differ?

• Aerobic respiration requires oxygen, while anaerobic respiration does not.

• Anaerobic respiration requires oxygen, while aerobic respiration does not.

• Both aerobic and anaerobic respiration require oxygen.

• Neither aerobic nor anaerobic respiration requires oxygen.

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How do plants regulate the carbon cycle?

• By absorbing carbon dioxide during photosynthesis

• By releasing oxygen during photosynthesis

• By storing carbon in their biomass

• All of the above

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Enzymes are:

• Proteins that act as biological catalysts

• Lipids that store energy

• Carbohydrates that provide energy

• Nucleic acids that store genetic information

Enzymes work by:

• binding to substrates and lowering the activation energy of reactions

• increasing the temperature of the reaction environment

• changing the pH of the reaction environment

• providing energy to the reaction