Review 1st Semester Final Exam Environmental Science

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What is photosynthesis?

Back

Photosynthesis is the process by which autotrophs, such as plants, convert solar energy into chemical energy in the form of glucose, using carbon dioxide and water.

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What is the consequence of reduced genetic diversity within a species?

Back

Reduced genetic diversity can lead to a higher risk of extinction due to the inability to adapt to changing environmental conditions.

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Define 'environment' in the context of ecology.

Back

The environment is the place in which organisms live and work, including all physical conditions such as land, water, air, plants, and animals that affect them.

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What are trophic levels?

Back

Trophic levels are the hierarchical levels in an ecosystem, representing the flow of energy from producers to various levels of consumers.

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What role do decomposers play in an ecosystem?

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Decomposers break down dead organic matter and recycle nutrients back into the ecosystem, facilitating nutrient cycling.

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What is the primary source of energy for most ecosystems?

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The primary source of energy for most ecosystems is sunlight, which is harnessed by autotrophs through photosynthesis.

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Explain the concept of ecological succession.

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Ecological succession is the process by which ecosystems change and develop over time, often following a disturbance.

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What is biodiversity?

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Biodiversity refers to the variety of life in a particular habitat or ecosystem, including the diversity of species, genetic variation, and ecosystem diversity.

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What is the significance of keystone species in an ecosystem?

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Keystone species are crucial for maintaining the structure of an ecosystem; their removal can lead to significant changes in the ecosystem.

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Define 'carrying capacity'.

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Carrying capacity is the maximum number of individuals of a species that an environment can sustainably support.