Refer to CBSE Class 12 Biology Ecosystem MCQs Set B provided below available for download in Pdf. The MCQ Questions for Class 12 Biology with answers are aligned as per the latest syllabus and exam pattern suggested by CBSE, NCERT and KVS. Chapter 12 Ecosystem Class 12 MCQ are an important part of exams for Class 12 Biology and if practiced properly can help you to improve your understanding and get higher marks. Refer to more Chapter-wise MCQs for CBSE Class 12 Biology and also download more latest study material for all subjects
MCQ for Class 12 Biology Chapter 12 Ecosystem
Class 12 Biology students should refer to the following multiple-choice questions with answers for Chapter 12 Ecosystem in Class 12.
Chapter 12 Ecosystem MCQ Questions Class 12 Biology with Answers
Question. A scorpion stalks, kills, and then eats a spider. Based on its behavior, which ecological terms describe the scorpion?
(a) producer, herbivore, decomposer
(b) producer, carnivore, heterotroph
(c) predator, carnivore, consumer
(d) predator, autotroph, herbivore
Answer : C
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. 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. 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. Secondary productivity is rate of formation of new organic matter by
(a) consumers
(b) decomposers
(c) producers
(d) parasites
Answer : A
Question. Most of the desert plants bloom during night time because
(a) their blooming is controlled by low temperature.
(b) they are sensitive to the phases of moon.
(c) the desert insects eat away flowers during day time.
(d) the desert insects are active during night time.
Answer : D
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. 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. Water co-deficient contains:
(a) Large thin walled cells
(b) Large-vacuoles
(c) Membrane
(d) All of these
Answer : C
Question. Which one of the following is not a function of an ecosystem?
(a) Energy flow
(b) Decomposition
(c) Productivity
(d) Stratification
Answer : D
Question. Flora and fauna in lake or ponds is
(a) lentic biota
(b) lotic biota
(c) abiotic biota
(d) field layer
Answer : A
Question. The food chain in which microbes breakdown energy rich compounds synthesized by producers is called
(a) ecosystem
(b) parasitic food chain
(c) detritus level chain
(d) predator food chain
Answer : C
Question. During food chain the maximum energy is stored in :
(a) Producers
(b) Decomposers
(c) Herbivoures
(d) Camivourse
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. 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. Natural reservoir of phosphorus is
(a) rock
(b) fossils
(c) sea water
(d) animal bones.
Answer : A
Question. Upper part of sea/aquatic ecosystem contains
(a) plankton
(b) nekton
(c) plankton and nekton
(d) benthos.
Answer : A
Question. About 70% of total global carbon is found in
(a) oceans
(b) forests
(c) grasslands
(d) agroecosystems.
Answer : A
Question. Best soil for plant growth is:
(a) Grit
(b) Sandy
(c) Soily
(d) Clay
Answer : D
Question. The mass of living materials at a trophic level at a particular time is called ____
(a) Standing state
(b) Standing crop
(c) Gross primary productivity
(d) Net primary productivity
Answer : B
Question. The upright pyramid of number is absent in
(a) pond
(b) forest
(c) lake
(d) grassland.
Answer : B
Question. Arrange the following ecosystems in increasing order of mean NPP (Tonnes / ha / year)
(a) Tropical deciduous forest
(b) Temperate coniferous forest
(c) Tropical rain forest
(d) Temperate deciduous forest
(a) B < A < D < C
(b) D < B < A < C
(c) A < C < D < B
(d) B < D < A < C
Answer : D
Question. Best type of pyramid which is always true is:
(a) Pyramid or energy
(b) Pyramid of Biomass
(c) Pyramid of number
(d) Both (a) and (c)
Answer : A
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 function of leghaemoglobin during biological nitrogen fixation in root nodules of legumes is to
(a) convert atmospheric N2 to NH3
(b) convert ammonia to nitrite
(c) transport oxygen for activity of nitrogenase
(d) protect nitrogenase from oxygen
Answer : D
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. Energy transfer from one trophic level to other, in a food chain, is
(a) 10%
(b) 20%
(c) 1%
(d) 2%.
Answer : A
Question. The primary succession refers to the development of communities on a
(a) forest clearing after devastating fire
(b) newly-exposed habitat with no record of earlier vegetation
(c) freshly cleared crop field
(d) pond, freshly filled with water after a dry phase.
Answer : B
Question. Which one of the following is not a gaseous biogeochemical cycle in the ecosystem
A. Carbon cycle
B. Oxygen cycle
C. Phosphorus cycle
D. Nitrogen cycle
Answer : C
Question. 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
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. Hibernation of some animals:
(a) Regular
(b) Periodic
(c) Suddenly
(d) Temporary
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
Question. Which of the following pairs is a sedimentary type of biogeochemical cycle?
(a) Phosphorus and nitrogen
(b) Phosphorus and sulphur
(c) Oxygen and nitrogen
(d) Phosphorus and carbon dioxide
Answer : D
Question. Both hydrarch and xerarch successions lead to
(a) medium water conditions
(b) xeric conditions
(c) highly dry conditions
(d) excessive wet conditions.
Answer : A
Question. Which of the following is not a producer?
a) Agaricus
b) Nostoc
c) Volvox
d) Spirogyra
Answer : A
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. How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?
a) 10%
b) 1%
c) 40%
d) 90%
Answer : A
CBSE Class 12 Biology Human Reproduction MCQs Set A |
CBSE Class 12 Biology Human Reproduction MCQs Set B |
CBSE Class 12 Biology Human Reproduction MCQs Set C |
CBSE Class 12 Biology Reproductive Health MCQs Set A |
CBSE Class 12 Biology Reproductive Health MCQs Set B |
CBSE Class 12 Biology Evolution MCQs Set A |
CBSE Class 12 Biology Evolution MCQs Set B |
CBSE Class 12 Biology Evolution MCQs Set C |
CBSE Class 12 Biology Ecosystem MCQs Set A |
CBSE Class 12 Biology Ecosystem MCQs Set B |
MCQs for Chapter 12 Ecosystem Biology Class 12
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