Q99.
What would happen if phytoplankton of an ocean is completely destroyed for some reason? 1. The ocean as a carbon sink would be adversely affected. 2. The food chains in the ocean would be adversely affected. 3. The density of ocean water would drastically decrease. Select the correct answer using the codes given below:
Answer
A
Explanation
Statement 1 is correct: Phytoplankton is a major carbon sink — it absorbs CO2 during photosynthesis and locks it up in sediment when it dies. Destroying phytoplankton would adversely affect the ocean's carbon sink capability. Statement 2 is correct: Phytoplankton forms the base of the marine food chain — its destruction would collapse food chains affecting all marine organisms. Statement 3 is incorrect: Density of ocean water depends on temperature and salinity, NOT on phytoplankton. Destroying phytoplankton would not drastically change ocean water density.