Ecosystem MCQs with Answers

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It is impossible for life to sustain itself without water, as it is the universal solvent essential for all biochemical reactions in living organisms.

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Algae (particularly marine algae and phytoplankton) are responsible for producing the largest amount of oxygen on Earth, contributing an estimated 50–80% of the planet's oxygen.

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The major cause of diseases in a fish pond is poor environmental/management conditions.

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The Earth's biosphere contains only about 0.1% of the planet's total organic carbon.

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The process of nutrient enrichment in water bodies leading to excessive plant growth, oxygen depletion, and death of aquatic life is called Eutrophication.

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The particular place where a species originated is called the center of origin.

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Population density is defined as the number of individuals per unit area or volume.

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The major reservoir of the sedimentary cycle is the lithosphere (Earth's crust).

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Fixation is not a process of decomposition; it refers to the conversion of atmospheric nitrogen into usable compounds, whereas fragmentation, leaching, and catabolism are all steps in the decomposition process.

One-liner

Overgrazing is a serious factor afflicting All of these — soil fertility, biodiversity, and soil erosion.