Which of the following ecosystem has the highest gross primary productivity?
Correct answer: B. Rainforest
- A. Mangroves
- B. Rainforest
- C. Grassland
- D. Coral reef
Explanation
Gross primary productivity is the total rate of photosynthesis, including the organic matter used up in respiration during the measurement period. Tropical evergreen/rainforests occur over equatorial/subequatorial regions with abundant warmth and rainfall (200-350 cm/yr) almost throughout the year. The forests are impenetrable (= jungle) with maximum diversity, e.g., 200 types of trees in one hectare, 70-80% of all insects, and 80-85% of all birds. Productivity is maximum here; it equates to 12000 kcal/m 2 /yr.
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About Man and His Environment
Ecosystems include biotic and abiotic components, food chains and webs, energy flow, nutrient cycles, populations and ecological relationships. Pollution and conservation cover air, water, soil and noise pollution, their effects on organisms, biodiversity loss, protected areas, sustainable resource use and methods for reducing environmental damage.
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