Question

Which of the following is the correct sequence of ecosystems in the order of decreasing productivity?

(a) Oceans, lakes, grasslands, mangroves
(b) Mangroves, oceans, grasslands, lakes
(c) Mangroves, grasslands, lakes, oceans
(d) Oceans, mangroves, lakes, grasslands.

Answer 1

The answer is c).......

Answer 2

Answer:

A tricky question that shows (c) and (d) can be the answer.

Explanation:

c) Mangroves, grasslands, lakes, ocean .

The rate of productivity will be the deciding factor of biomass, among which they are of two types primary and secondary.

In an average ocean productivity is around 50 grams carbon per sq. m/ year. An average land productivity can be up to 160 grams / sq m for every year. Open ocean productivity is comparable to desert production. Thus, the order must be in ascending order.  

d) Oceans, mangroves, lakes, grasslands

The total productivity of ocean is about 8 times the primary productivity. Thus, the productivity may vary in descending order.