Question
Biology Question on Eco-System
Which of the following ecosystem has the highest gross primary productivity?
A
mangroves
B
rain forest
C
grassland
D
coral reef.
Answer
rain forest
Explanation
Solution
Gross primary productivity is the total rate of photosynthesis, including the organic matter used up in respiration during the measurement period. Tropical evergreen/rain forests 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, Ecosystem 70-80% of all insects 80-85% of all birds. Productivity is maximum here, 12000 kcal/nr/yr.