Question

Assertion (A): Despite occupying about 70% of the earth's surface, Oceans are a low productivity ecosystem.

Reason (R): In aquatic ecosystems, productivity is limited by light that decreases with increasing water depth.

Options

• Both assertion (A) and reason (R) are true, and reason is the correct explanation of assertion.

• Both assertion (A) and reason (R) are true, but reason is not the correct explanation of assertion.

• Assertion (A) is true but reason (R) is false.

• Both assertion (A) and reason (R) are false.

Answer 1

Both assertion (A) and reason (R) are true, and reason is the correct explanation of assertion.

Explanation:

Although oceans cover about 70% of the earth's surface, light decreases rapidly with depth, so productivity is low. Thus the reason correctly explains why oceans are low-productivity ecosystems.