250+ TOP MCQs on Ecosystem – Productivity and Answers

Biology Quiz for Pharmacy Entrance Exams on “Ecosystem – Productivity – 2”.

1. Which of the following is estimated in either the photosynthetic number or chlorophyll content?
a) Gross primary productivity
b) Net primary productivity
c) Primary productivity
d) Net productivity
Answer: b
Clarification: The rate of production of organic matter during photosynthesis is defined as the gross primary productivity (GPP). It is estimated in either the photosynthetic number or chlorophyll content.

2. On whom does the primary productivity depend on?
a) Plants
b) Animals
c) Sunlight
d) Wing
Answer: a
Clarification: The rate at which solar energy is converted and stored by the producers per unit area over a time period is called primary productivity. It mainly depends on the variety of plant species residing in a particular area.

3. What is the approximate amount of the annual net primary productivity of the whole biosphere?
a) 80 million tons of organic matter
b) 170 billion tons of organic matter
c) 10 billion tons of organic matter
d) 2 million tons of organic matter
Answer: b
Clarification: The net primary productivity is the energy left after the respiration i.e. the gross primary productivity subtracted by respiration losses. It is approximately 170 billion tons of organic matter of the whole biosphere.

4. How much of Earth’s surface is occupied by oceans?
a) 90%
b) 1%
c) 65%
d)70%
Answer: d
Clarification: Almost 70% of Earth’s surface is occupied by oceans. An ocean is the largest body of water comprising of much of the planet’s hydrosphere. In all, there are 5 oceans on Earth namely Pacific, Atlantic, Indian, Antarctic, and Arctic oceans.

5. How much is the productivity of oceans?
a) 10 billion tons
b) 170 billion tons
c) 55 billion tons
d) 2 million tons
Answer: c
Clarification: Productivity is the rate of new biomass production by an individual, population, community within an ecosystem. The productivity of oceans is approximately 55 billion tons.

6. How much is the productivity of landmass?
a) 115 billion tons
b) 170 billion tons
c) 55 million tons
d) 170 million tons
Answer: a
Clarification: Productivity is the rate of new biomass production by an individual, population, community within an ecosystem. The productivity of landmass is approximately 115 billion tons.

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