MCQ Questions for Class 12 Biology Chapter 14 Ecosystem with Answers

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

Question 1.
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

Answer: (c) Pyramid of biomass in a lake


Question 2.
Energy transferred from one trophic level to another
(a) 5%
(b) 10%
(c) 15%
(d) 20%

Answer

Answer: (b) 10%


Question 3.
Maximum absorption of rainfall water is done by
(a) Tropical deciduous forest
(b) Tropical evergreen forest
(c) Tropical savannah
(d) Scrule forest

Answer

Answer: (b) Tropical evergreen forest


Question 4.
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

Answer: (a) An animal feeding on decaying organic matter


Question 5.
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

Answer: (d) herbivores have a better energy conversion efficiency than carnivores.


Question 6.
Which of the following pairs is mismatched?
(a) Tundra-permafrost
(b) Savanna-Acacia trees
(c) Praire-epiphytes
(d) Coniferous forest-evergreen trees

Answer

Answer: (c) Praire-epiphytes


Question 7.
The most abundant element present in the plants is
(a) nitrogen
(b) manganese
(c) iron
(d) carbon

Answer

Answer: (d) carbon


Question 8.
These belong to the category of primary consumers
(a) Insects and cattle
(b) Eagle and snakes
(c) Water insects
(d) Snakes and frogs

Answer

Answer: (a) Insects and cattle


Question 9.
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

Answer: (b) Gross production


Question 10.
Largest reservoir of sulphur is
(a) Atmosphere
(b) Rocks
(c) Ocean
(d) Lake

Answer

Answer: (b) Rocks


Question 11.
Maximum productivity is found in
(a) Grassland
(b) Desert
(c) Ocean
(d) Tropical rain forest

Answer

Answer: (c) Ocean


Question 12.
Concentration of nitrogen remains constant by
(b) Nitrogen cycle
(b) Thundering and lightning
(c) Enzymes
(d) Both (a) and (b)

Answer

Answer: (d) Both (a) and (b)


Question 13.
In the phosphorus cycle, phosphate becomes available by weathering of rocks first to
(a) Consumers
(b) Producers
(c) Decomposers
(d) None of these

Answer

Answer: (b) Producers


Question 14.
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

Answer: (b) Less than the present


Question 15.
Bacterial role in carbon cycle is
(a) Chemosynthesis
(b) Photosynthesis
(c) Breakdown of organic matter
(d) Assimilation of nitrogen compounds

Answer

Answer: (c) Breakdown of organic matter


Question 16.
Which important greenhouse gas, other than methane is being produced from the agricultural fields?
(a) Arsine
(b) Sulphur dioxide
(c) Ammonia
(d) Nitrous oxide

Answer

Answer: (d) Nitrous oxide


Question 17.
Zone of atmosphere near the ground is
(a) Troposphere
(b) Stratosphere
(c) Homosphere
(d) All of these

Answer

Answer: (a) Troposphere


Question 18.
CO2 content of atmosphere is about
(a) 6.5%
(b) 3.334%
(c) 0.34%
(d) 0.034%

Answer

Answer: (d) 0.034%


Question 19.
Ultraviolet radiation from sunlight causes a reaction which produces
(a) O3
(b) SO2
(c) CO
(d) CH4

Answer

Answer: (a) O3


Question 20.
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

Answer: (b) Second trophic level


Fill in the Blanks

Question 1.
Inverted pyramid is generally found in ………………….

Answer

Answer: deep water bodies


Question 2.
Humus serves as a reservoir of ………………….

Answer

Answer: nutrients


Question 3.
In oceans, the productivity is generally limited by ………………….

Answer

Answer: nitrogen


Question 4.
Certain …………………. changes sulphides to sulphates.

Answer

Answer: bacteria


Question 5.
Composition of the atmosphere is quite uniform upto a height of …………………. kilometres.

Answer

Answer: 80


Question 6.
Vertical distribution of different species occupying different levels’is called ………………….

Answer

Answer: stratification


Question 7.
…………………. is the rate of formation of new organic matter by consumers.

Answer

Answer: secondary productivity


Question 8.
Dead plant parts and animal remains are called ………………….

Answer

Answer: detritus


Question 9.
Nutrient cycles are also known as ………………….

Answer

Answer: biogeochemical cycles


Question 10.
Layer of ozone occurs at a height of about to …………………. km in the atmosphere.

Answer

Answer: 25-50.


Write True or False

Question 1.
Lions and wolves occupy the same trophic level.

Answer

Answer: True


Question 2.
Savannahs are tropical rain forests.

Answer

Answer: False


Question 3.
Pyramids of numbers deals with the number of individuals in a community.

Answer

Answer: False


Question 4.
Hygrometer is used to measure the relative humidity.

Answer

Answer: True


Question 5.
Tropical forest occur in India in Rajasthan.

Answer

Answer: True


Question 6.
Pyramid of numbers in a pond ecosystem is inverted.

Answer

Answer: False


Question 7.
The maximum biomass occurs in temperate forests.

Answer

Answer: False


Question 8.
Man-made ecosystems have many dominant plant species.

Answer

Answer: False


Question 9.
Mineral cycles are not balanced.

Answer

Answer: True


Question 10.
Earth is an open system regarding matter.

Answer

Answer: False


One Word Questions

Question 1.
Give an alternate term for ecological pyramids.

Answer

Answer: Eltonian pyramids.


Question 2.
Name any vesperal animal.

Answer

Answer: Rabbit.


Question 3.
How deep in sea, producers are present?

Answer

Answer: Upto 200 m.


Question 4.
Name any one Eutrophic lake.

Answer

Answer: Dal lake in Kashmir.


Question 5.
Name any denitrifying bacteria.

Answer

Answer: Pseudomonas aeruginosa.


Question 6.
For how long the entire CO2 of the air can last with its use in photosynthesis by green plants?

Answer

Answer: 1 year.


Question 7.
Name the dark coloured amorphorus substance accumulated as a result of humification.

Answer

Answer: Humus.


Question 8.
What is unit of energy measurement for energy pyramids?

Answer

Answer: Kcalm-2yr-1


Question 9.
Which is the most stable ecosystem?

Answer

Answer: Oceans.


Question 10.
In a food chain, the maximum population is of which organisms?

Answer

Answer: Producers.


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
Answer

Answer:

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

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