The productivity of aquatic ecosystem is basically determined by light and____________?
Correct answer: D. Nutrients
- A. CO2
- B. O2
- C. Water
- D. Nutrients
Explanation
Aquatic ecosystem productivity depends strongly on available light for photosynthesis and on nutrients such as nitrates and phosphates needed for algal and plant growth. Students may choose CO2 because it is a photosynthetic raw material, but nutrient availability is usually the major limiting factor after light penetration is considered.
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About Biological Importance of Water
Water supports life through its polarity, hydrogen bonding and ability to dissolve ionic and polar substances. Its high specific heat, heat of vaporization, cohesion, adhesion and incompressibility help regulate temperature, transport materials and maintain structure, while hydrolysis and osmosis depend directly on water.
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