Arrange the following ecosystems in descending order in terms of Net Primary Productivity:
1. Tropical Rainforest
2. Swamps and Marshes
3. Temperate Rainforest
4. Lake and Streams

Select the correct answer using the codes given below.
(a) 2-1-3-4
(b) 2-3-1-4
(c) 3-1-4-2
(d) 1-2-3-4

Question

Arrange the following ecosystems in descending order in terms of Net Primary Productivity:
1. Tropical Rainforest
2. Swamps and Marshes
3. Temperate Rainforest
4. Lake and Streams

Select the correct answer using the codes given below.
(a) 2-1-3-4
(b) 2-3-1-4
(c) 3-1-4-2
(d) 1-2-3-4

ONLiNE UPSC · Accepted Answer

Primary production is defined as the amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis. It is expressed in terms of weight (gm&ndash;2) or energy (kcal m&ndash;2).
It can be divided into gross primary productivity (GPP) and net primary productivity (NPP). Gross primary productivity of an ecosystem is the rate of production of organic matter during photosynthesis. A considerable amount of GPP is utilised by plants in respiration. Gross primary productivity minus respiration losses (R), is the net primary productivity (NPP).
Net primary productivity is the available biomass for the consumption to heterotrophs (herbivores and decomposers).

General NPP of Different Ecosystems (Approximate Values):
● Swamps and Marshes &rarr; 2500 gC/m&sup2;/yr (Highest)
● Tropical Rainforests &rarr; 2200 gC/m&sup2;/yr
● Temperate Rainforest &rarr; 1300 gC/m&sup2;/yr
● Lakes and Streams &rarr; 500 gC/m&sup2;/yr (Lowest)

Ecosystems

Net Primary Productivity

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M Question 1	⏱ 0
Arrange the following ecosystems in descending order in terms of Net Primary Productivity: 1. Tropical Rainforest 2. Swamps and Marshes 3. Temperate Rainforest 4. Lake and Streams Select the correct answer using the codes given below. (a) 2-1-3-4 (b) 2-3-1-4 (c) 3-1-4-2 (d) 1-2-3-4