This set of Class 12 Biology Multiple Choice Questions & Answers (MCQs) focuses on “Ecosystem – Productivity – 2” for Pharmacy Entrance Exam.
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
View Answer
Explanation: 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
View Answer
Explanation: 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
View Answer
Explanation: 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%
View Answer
Explanation: 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
View Answer
Explanation: 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
View Answer
Explanation: 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.
Sanfoundry Global Education & Learning Series – Biology – Class 12.
To practice all chapters and topics of Biology for Pharmacy Entrance Exam, here is complete set of 1000+ Multiple Choice Questions and Answers.
If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]
- Practice Class 11 - Biology MCQs
- Practice Class 12 - Mathematics MCQs
- Practice Class 12 - Physics MCQs
- Check Class 12 - Biology Books
- Practice Class 12 - Chemistry MCQs
