Science Grade 8, Unit 5 Test

Front

What is the carbon cycle?

Back

The carbon cycle is the process by which carbon is exchanged among the atmosphere, land, water, and living organisms. It involves processes like photosynthesis, respiration, decomposition, and combustion.

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What is photosynthesis?

Back

Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy, usually from the sun, into chemical energy in the form of glucose, using carbon dioxide and water.

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What is cellular respiration?

Back

Cellular respiration is the process by which cells break down glucose and oxygen to produce energy (ATP), carbon dioxide, and water.

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What are producers in an ecosystem?

Back

Producers are organisms, such as plants and algae, that can make their own food through photosynthesis and serve as a food source for consumers.

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What are consumers in an ecosystem?

Back

Consumers are organisms that cannot produce their own food and rely on eating other organisms (plants or animals) for energy.

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What is the role of decomposers in an ecosystem?

Back

Decomposers, such as bacteria and fungi, break down dead organic matter, returning nutrients to the soil and making them available for producers.

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What is the biosphere?

Back

The biosphere is the global sum of all ecosystems, where life exists, including land, water, and the atmosphere.

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What is the hydrosphere?

Back

The hydrosphere encompasses all water on Earth, including oceans, rivers, lakes, and water vapor in the atmosphere.

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What is the atmosphere?

Back

The atmosphere is the layer of gases surrounding Earth, essential for life, providing oxygen and protecting from harmful solar radiation.

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What is the geosphere?

Back

The geosphere refers to the solid parts of Earth, including rocks, soil, and the landforms.