37.Which of the following ecosystems will be more productive in terms of primary productivity? A. A young forest B. A natural old forest. C. A shallow polluted lake D. Alpine meadow
Option A. Primary productivity depends on the plant species inhabiting a particular area and also on a variety of environmental factors, availability of nutrients and photosynthetic capacity of the plants. ∙ A young forest has not yet reached the climax and has low density of trees which accounts for its low primary productivity. ∙ A natural old forest is supposed to have reached its climax as it comprises of big trees with thick foliage which is responsible for its high primary productivity. ∙ A shallow polluted lake is devoid of producers as a consequence of pollution and accounts to a very low primary productivity. ∙ An alpine meadow is full of grasses with little or no tree which confers a low primary productivity. Thus, it can be concluded from the above discussion that a natural old forest ecosystem will be more productive in terms of primary productivity in comparison the above mentioned different ecosystems.
