MCQs For NCERT Class 12 Biology Chapter 14 Ecosystem

MCQs Class 12

Please refer to the MCQ Questions for Class 12 Biology Chapter 14 Ecosystem with Answers. The following Ecosystem Class 12 Biology MCQ Questions has been designed based on the latest syllabus and examination pattern for Class 12. Our experts have designed MCQ Questions for Class 12 Biology with Answers for all chapters in your NCERT Class 12 Biology book.

Ecosystem Class 12 MCQ Questions with Answers

See below Ecosystem Class 12 Biology MCQ Questions, solve the questions and compare your answers with the solutions provided below. 

Question. Vertical distribution of different species occupying different levels in a biotic community is known as
(a) zonation
(b) pyramid
(c) divergence
(d) stratification.

Answer

D

Question. Which one of the following is not a functional unit of an ecosystem?
(a) Energy flow
(b) Decomposition
(c) Productivity
(d) Stratification 

Answer

D

Question. Which one of the following is one of the characteristics of a biological community?
(a) Stratification
(b) Natality
(c) Mortality
(d) Sex-ratio 

Answer

A

Question. Which of the following is the most stable ecosystem?
(a) Mountain
(b) Ocean
(c) Forest
(d) Desert

Answer

B

Question. The term ecosystem was coined by
(a) E. Haeckel
(b) E.Warming
(c) E.P. Odum
(d) A. G. Tansley.

Answer

D

Question. Which one of the following is a characteristic feature of cropland ecosystem?
(a) Absence of weeds
(b) Ecological succession
(c) Absence of soil organisms
(d) Least genetic diversity 

Answer

D

Question. In an ecosystem the rate of production of organic matter during photosynthesis is termed as
(a) secondary productivity
(b) net productivity
(c) net primary productivity
(d) gross primary productivity. 

Answer

D

Question. Secondary productivity is rate of formation of new organic matter by
(a) consumers
(b) decomposers
(c) producers
(d) parasites.

Answer

A

Question. The rate of formation of new organic matter by rabbit in a grassland, is called
(a) net productivity
(b) secondary productivity
(c) net primary productivity
(d) gross primary productivity. 

Answer

B

Question. Mass of living matter at a trophic level in an area at any time is called
(a) standing crop
(b) detritus
(c) humus
(d) standing state

Answer

A

Question. In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?
(a) Gross primary productivity is always less than Net primary productivity.
(b) Gross primary productivity is always more than Net primary productivity.
(c) Gross primary productivity and Net primary productivity are one and same.
(d) There is no relationship between Gross primary productivity and Net primary productivity.

Answer

B

Question. The mass of living material at a trophic level at a particular time is called
(a) net primary productivity
(b) standing crop
(c) gross primary productivity
(d) standing state. 

Answer

B

Question. Which of the following is expected to have the highest value (gm/m2/yr) in a grassland ecosystem?
(a) Secondary production
(b) Tertiary production
(c) Gross production (GP)
(d) Net production (NP) 

Answer

C

Question. The rate at which light energy is converted into chemical energy of organic molecules is the ecosystem’s
(a) net secondary productivity
(b) gross primary productivity
(c) net primary productivity
(d) gross secondary productivity. 

Answer

B

Question. Which of the following ecosystem has the highest gross primary productivity?
(a) Mangroves
(b) Rainforest
(c) Grassland
(d) Coral reef

Answer

B

Question. Maximum solar energy is trapped by
(a) planting trees
(b) cultivating crops
(c) growing algae in tanks
(d) growing grasses. 

Answer

C

Question. A very efficient converter of solar energy with net productivity of 204 kg/m2 or more is the crop
(a) wheat
(b) sugarcane
(c) rice
(d) bajra.

Answer

B

Question. The biomass available for consumption by the herbivores and the decomposers is called
(a) net primary productivity
(b) secondary productivity
(c) standing crop
(d) gross primary productivity.

Answer

A

Question. Which one of the following ecosystem types has the highest annual net primary productivity?
(a) Tropical deciduous forest
(b) Temperate evergreen forest
(c) Temperate deciduous forest
(d) Tropical rainforest 

Answer

D

Question. Plant decomposers are
(a) monera and fungi
(b) fungi and plants
(c) protista and animalia
(d) animalia and monera.

Answer

A

Question. Which of the following acts as “nature’s scavengers”?
(a) Insects
(b) Microorganisms
(c) Man
(d) Animals 

Answer

B

Question. If we completely remove the decomposers from an ecosystem, its functioning will be adversely affected, because
(a) mineral movement will be blocked
(b) the rate of decomposition will be very high
(c) energy flow will be blocked
(d) herbivores will not receive solar energy.

Answer

A

Question. The primary producers of the deep-sea hydrothermal vent ecosystem are
(a) green algae
(b) chemosynthetic bacteria
(c) blue-green algae
(d) coral reefs. 

Answer

B

Question. The breakdown of detritus into smaller particles by earthworm is a process called
(a) humification
(b) fragmentation
(c) mineralisation
(d) catabolism

Answer

B

Question. The slow rate of decomposition of fallen logs in nature is due to their
(a) anaerobic environment around them
(b) low cellulose content
(c) low moisture content
(d) poor nitrogen content.

Answer

D

Question. Which of the following is a primary consumer in maize field ecosystem?
(a) Grasshopper
(b) Wolf
(c) Phytoplankton
(d) Lion

Answer

A

Question. When man eats fish which feeds on zooplanktons which have eaten small plants, the producer in this chain is
(a) small plants
(b) fish
(c) man
(d) zooplankton.

Answer

A

Question. Identify the possible link “A” in the following food chain.
Plant → Insect → Frog → “A” → Eagle
(a) Rabbit
(b) Wolf
(c) Cobra
(d) Parrot

Answer

C

Question. Of the total incident solar radiation the proportion of PAR is
(a) about 70%
(b) about 60%
(c) less than 50%
(d) more than 80%.

Answer

C

Question. Most animals that live in deep oceanic waters are
(a) tertiary consumers
(b) detritivores
(c) primary consumers
(d) secondary consumers. 

Answer

B

Question. If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain?
Plant → Mice → Snake → Peacock
(a) 0.02 J
(b) 0.002 J
(c) 0.2 J
(d) 0.0002 J 

Answer

A

Question. Bamboo plant is growing in a fir forest then what will be the trophic level of it? A
(a) First trophic level (T1)
(b) Second trophic level (T2)
(c) Third trophic level (T3)
(d) Fourth trophic level (T4

Answer

A

Question. Which is the reason for highest biomass in aquatic ecosystem?
(a) Nano plankton, blue green algae and green algae
(b) Sea grass and slime moulds
(c) Benthic and brown algae
(d) Diatoms 

Answer

C

Question. Energy transfer from one trophic level to other, in a food chain, is
(a) 10%
(b) 20%
(c) 1%
(d) 2%.

Answer

A

Question. Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?
(a) Sparrow
(b) Lion
(c) Goat
(d) Frog 

Answer

A

Question. Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem?
(a) Fish
(b) Zooplankton
(c) Frog
(d) Phytoplankton

Answer

A

Question. In a biotic community, the primary consumers are
(a) detritivores
(b) herbivores
(c) carnivores
(d) omnivores.

Answer

B

Question. The dominant second trophic level, in a lake ecosystem, is
(a) phytoplankton
(b) zooplankton
(c) benthos
(d) plankton. 

Answer

B

Question. Food chain in which microorganisms breakdown the food formed by primary producers is
(a) parasitic food chain
(b) detritus food chain
(c) consumer food chain
(d) predator food chain. 

Answer

B

Question. In a terrestrial ecosystem such as forest, maximum energy is in which trophic level?
(a) T3
(b) T4
(c) T1
(d) T

Answer

C

Question. The 10% energy transfer law of food chain was given by
(a) Lindemann
(b) Tansley
(c) Stanley
(d) Weismann.

Answer

A

Question. Pick up the correct food chain.
(a) Grass → Chameleon → Insect → Bird
(b) Grass → Fox → Rabbit → Bird
(c) Phytoplankton → Zooplankton → Fish
(d) Fallen leaves → Bacteria → Insect larvae

Answer

C

Question. In an ecosystem, which one shows one-way passage?
(a) Free energy
(b) Carbon
(c) Nitrogen
(d) Potassium

Answer

A

Question. Which of the following ecological pyramids is generally inverted?
(a) Pyramid of biomass in a sea
(b) Pyramid of numbers in grassland
(c) Pyramid of energy
(d) Pyramid of biomass in a forest 

Answer

A

Question. What type of ecological pyramid would be obtained with the following data?
Secondary consumer : 120 g
Primary consumer : 60 g
Primary producer : 10 g
(a) Inverted pyramid of biomass
(b) Pyramid of energy
(c) Upright pyramid of numbers
(d) Upright pyramid of biomass 

Answer

A

Question. Upper part of sea/aquatic ecosystem contains
(a) plankton
(b) nekton
(c) plankton and nekton
(d) benthos.

Answer

A

Question. What is true of ecosystem?
(a) Primary consumers are least dependent upon producers.
(b) Primary consumers out-number producers.
(c) Producers are more than primary consumers.
(d) Secondary consumers are the largest and most powerful.

Answer

C

Question. Which ecosystem has the maximum biomass?
(a) Grassland ecosystem
(b) Pond ecosystem
(c) Lake ecosystem
(d) Forest ecosystem

Answer

D

Question. Which one of the following is not used for construction of ecological pyramids?
(a) Fresh weight
(b) Dry weight
(c) Number of individuals
(d) Rate of energy flow 

Answer

A

Question. Pyramid of numbers deals with number of
(a) species in an area
(b) individuals in a community
(c) individuals in a trophic level
(d) subspecies in a community.

Answer

C

Ecosystem Class 12 MCQ Questions