Bihar Board - Class 12 Biology- Chapter 14. Ecosystem Multiple Choice Questions
The multiple choice questions for Chapter 14. Ecosystem of Class 12 Chemistry are provided here in English. These questions are based on the NCERT curriculum for Class 12. They are designed to help students assess their understanding of the key concepts covered in the chapter. These multiple choice questions will be useful not only for the Class 12 board exams but also for entrance exams like NEET. The questions for Bihar Board Class 12 Chemistry, Chapter 14. Ecosystem, have been prepared by expert teachers at Vidyakul.
Multiple Choice Question
1. Productivity in terrestrial ecosystems is affected by
(a) temperature.
(b) light intensity,
(c) availability of nutrients and water.
(d) all of the above.
Answer:d
2. The open ocean and tropical rain forest are the two largest contributors to Earth's net primary productivity because
(a) both have high rates of net primary productivity.
(b) both cover huge surface areas of the Earth.
(c) nutrients cycle fastest in these two ecosystems.
(d) the ocean covers a huge surface area and the tropical rain forest has a high rate of productivity.
Answer:d
3. Which of the following is not a part of either gross or net primary production in plants?
(a) Light reflected from the leaf
(b) Energy fixed into glucose
(c) Energy expended in moving material through membranes
(d) Energy used to excite a chlorophyll electron
Answer:a
4. Primary productivity
(a) is equal to the standing crop of an ecosystem.
(b) is greatest in freshwater ecosystems.
(c) is the rate of conversion of light to chemical energy in an ecosystem.
(d) is inverted in some aquatic ecosystems.
Answer:c
5. Ecosystem has two components
(a) Plants and animals
(b) Weeds and trees
(c) Biotic and abiotic
(d) Frogs and man.
Answer:c
6. Ecological niche refers to
(a) Habitat
(b) Microhabitat
(c) Habitat and its relationship
(d) Habitat and climate.
Answer:c
7. Which of the following is an abiotic component of the ecosystem?
(a) Bacteria
(b) Humus
(c) Plants
(d) Fungi.
Answer:b
8. The correct definition of ecosystem is
(a) A community of organisms interacting with one another
(b) The biotic components of an area
(c) That part of the earth and its atmosphere which is inhabited by living organisms
(d) A community of organisms together with the environment in which they live.
Answer:d
9. The secondary productivity means
(a) Rate of increase in the biomass of autotrophs
(b) Rate of increase in the biomass of heterotrophs
(c) The rate at which the organic molecules are formed in an autotroph
(d) The rate at which organic molecules are used up by an autotroph.
Answer:b
10. Which of the following is true about the amount of sunlight and heat arriving on Earth?
(a) Every place on Earth receives the same annual number of hours of sunlight and the same amount of heat.
(b) Every place on Earth receives the same annual number of hours of sunlight, but not the same amount of heat.
(c) Every place on Earth receives the same annual amount of heat, but not the same number of hours of sunlight.
(d) Both the annual amount of sunlight and the amount of heat received vary over the surface of Earth.
Answer:b
