We have compiled the NCERT MCQ Questions for Class 12 Biology Chapter 14 Ecosystem with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 12 Biology with Answers on a daily basis and score well in exams. Refer to the Ecosystem Class 12 MCQs Questions with Answers here along with a detailed explanation.
Ecosystem Class 12 MCQs Questions with Answers
Multiple Choice Type Questions
Given below is one of the types of ecological pyramids. This type represents
(a) Pyramid of numbers in a grassland
(b) Pyramid of biomass in a follow land
(c) Pyramid of biomass in a lake
(d) Energy pyramid in a spring
Answer: (c) Pyramid of biomass in a lake
Energy transferred from one trophic level to another
Answer: (b) 10%
Maximum absorption of rainfall water is done by
(a) Tropical deciduous forest
(b) Tropical evergreen forest
(c) Tropical savannah
(d) Scrule forest
Answer: (b) Tropical evergreen forest
Which of the following is called as a detrivore?
(a) An animal feeding on decaying organic matter
(b) An animal feeding on a plant
(c) A plant feeding on an animal
(d) An animal feeding on another animal
Answer: (a) An animal feeding on decaying organic matter
The pyramid of energy is always upright for any ecosystem. This situation indicates the fact that:
(a) producers have the lowest energy conversion efficiency
(b) carnivores have a better energy conversion efficiency
(c) energy, conversion efficiency is the same in all trophic levels
(d) herbivores have a better energy conversion efficiency than carnivores.
Answer: (d) herbivores have a better energy conversion efficiency than carnivores.
Which of the following pairs is mismatched?
(b) Savanna-Acacia trees
(d) Coniferous forest-evergreen trees
Answer: (c) Praire-epiphytes
The most abundant element present in the plants is
Answer: (d) carbon
These belong to the category of primary consumers
(a) Insects and cattle
(b) Eagle and snakes
(c) Water insects
(d) Snakes and frogs
Answer: (a) Insects and cattle
Which of the following is expected to have the highest value (gm/m²/yr) in a grassland ecosystem?
(a) Tertiary production
(b) Gross production
(c) Net production
(d) Secondary production
Answer: (b) Gross production
Largest reservoir of sulphur is
Answer: (b) Rocks
Maximum productivity is found in
(d) Tropical rain forest
Answer: (c) Ocean
Concentration of nitrogen remains constant by
(b) Nitrogen cycle
(b) Thundering and lightning
(d) Both (a) and (b)
Answer: (d) Both (a) and (b)
In the phosphorus cycle, phosphate becomes available by weathering of rocks first to
(d) None of these
Answer: (b) Producers
If there was no CO2 in the earth’s atmosphere, the temperature of the earth’s surface would be
(a) Same as the present
(b) Less than the present
(c) Higher than the present
(d) Depends on the amount of O2 in the atmosphere
Answer: (b) Less than the present
Bacterial role in carbon cycle is
(c) Breakdown of organic matter
(d) Assimilation of nitrogen compounds
Answer: (c) Breakdown of organic matter
Which important greenhouse gas, other than methane is being produced from the agricultural fields?
(b) Sulphur dioxide
(d) Nitrous oxide
Answer: (d) Nitrous oxide
Zone of atmosphere near the ground is
(d) All of these
Answer: (a) Troposphere
CO2 content of atmosphere is about
Answer: (d) 0.034%
Ultraviolet radiation from sunlight causes a reaction which produces
Answer: (a) O3
Mr. X is eating curd/yoghurt. For this food intake in a food chain he should be considerd as Occupying
(a) First trophic level
(b) Second trophic level
(c) Third trophic level
(d) Fourth trophic level
Answer: (b) Second trophic level
Fill in the Blanks
Inverted pyramid is generally found in ………………….
Answer: deep water bodies
Humus serves as a reservoir of ………………….
In oceans, the productivity is generally limited by ………………….
Certain …………………. changes sulphides to sulphates.
Composition of the atmosphere is quite uniform upto a height of …………………. kilometres.
Vertical distribution of different species occupying different levels’is called ………………….
…………………. is the rate of formation of new organic matter by consumers.
Answer: secondary productivity
Dead plant parts and animal remains are called ………………….
Nutrient cycles are also known as ………………….
Answer: biogeochemical cycles
Layer of ozone occurs at a height of about to …………………. km in the atmosphere.
Write True or False
Lions and wolves occupy the same trophic level.
Savannahs are tropical rain forests.
Pyramids of numbers deals with the number of individuals in a community.
Hygrometer is used to measure the relative humidity.
Tropical forest occur in India in Rajasthan.
Pyramid of numbers in a pond ecosystem is inverted.
The maximum biomass occurs in temperate forests.
Man-made ecosystems have many dominant plant species.
Mineral cycles are not balanced.
Earth is an open system regarding matter.
One Word Questions
Give an alternate term for ecological pyramids.
Answer: Eltonian pyramids.
Name any vesperal animal.
How deep in sea, producers are present?
Answer: Upto 200 m.
Name any one Eutrophic lake.
Answer: Dal lake in Kashmir.
Name any denitrifying bacteria.
Answer: Pseudomonas aeruginosa.
For how long the entire CO2 of the air can last with its use in photosynthesis by green plants?
Answer: 1 year.
Name the dark coloured amorphorus substance accumulated as a result of humification.
What is unit of energy measurement for energy pyramids?
Which is the most stable ecosystem?
In a food chain, the maximum population is of which organisms?
Match the Following
|Column I||Column II|
|1. Primary productivity||A. Bacteria, Fungi|
|2. Natural ecosystem||B. Consumers|
|3. Desert||C. Lake, Forest|
|4. Decomposers||D. Biome|
|5. Secondary productivity||E. Producers|
|Column I||Column II|
|1. Primary productivity||E. Producers|
|2. Natural ecosystem||C. Lake, Forest|
|3. Desert||D. Biome|
|4. Decomposers||A. Bacteria, Fungi|
|5. Secondary productivity||B. Consumers|
Hope the information shed above regarding NCERT MCQ Questions for Class 12 Biology Chapter 14 Ecosystem with Answers Pdf free download has been useful to an extent. If you have any other queries of CBSE Class 12 Biology Ecosystem MCQs Multiple Choice Questions with Answers, feel free to reach us so that we can revert back to us at the earliest possible.