7th Grade Science Unit 2

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What are decomposers?

Back

Organisms that break down dead or decaying organisms, returning vital nutrients to the ecosystem.

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Why are decomposers important to ecosystems?

Back

They return vital nutrients to the ecosystem, helping to maintain soil health and support plant growth.

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What do trophic pyramids illustrate?

Back

They illustrate the flow of energy in an ecosystem, showing that the amount of energy available decreases as it moves up the pyramid.

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What happens to energy as it flows through an ecosystem?

Back

The amount of energy available to each organism decreases as it flows through the ecosystem.

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What is matter in the context of ecosystems?

Back

Matter refers to the physical substances that make up organisms and are transferred through food chains.

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Why isn't all of a prey's matter transferred to the predator?

Back

Because matter can become waste, be lost as carbon dioxide, or be lost to the environment.

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Front

What is the impact of a drought on grass populations?

Back

A drought can decrease the population of grass, leading to less food for herbivores like mice.

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How do changes in one population affect others in an ecosystem?

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Changes in one population, like a decrease in grass, can lead to decreases in populations that rely on it for food.

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Where does photosynthesis occur in a plant cell?

Back

Photosynthesis takes place in the chloroplasts.

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What is photosynthesis?

Back

The process by which green plants use sunlight to synthesize foods with the help of chlorophyll.

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