CBSE Class 12 Ecosystem Multiple Choice Questions with Answers. MCQ Questions Class 12 Ecosystem with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT MCQ questions Class 12 Ecosystem with Answers to know their preparation level.
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MCQ Questions Class 12 Ecosystem with Answers - Set - 5
Question 1:
Natural reservoir of phosphorus is
(a) rock
(b) fossils
(c) sea water
(d) animal bones
Correct Answer – (A)
Question 2:
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
Correct Answer – (C)
Question 3:
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.
Correct Answer – (B)
Question 4:
Which one of the following is one of the characteristics of a biological community?
(a) Stratification
(b) Natality
(c) Mortality
(d) Sex-ratio
Correct Answer – (B)
Question 5:
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
Correct Answer – (D)
MCQ Questions Class 12 Ecosystem With Answers
Question 6:
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
Correct Answer – (B)
Question 7:
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
Correct Answer – (A)
Question 8:
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
Correct Answer – (D)
Question 9:
The primary producers of the deep-sea hydrothermal vent ecosystem are
(a) green algae
(b) chemosynthetic bacteria
(c) blue-green algae
(d) coral reefs.
Correct Answer – (B)
Question 10:
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
Correct Answer – (C)
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