Q21
The term ecosystem was coined by
Correct Answer
Option B
Solution
(b) Sir Arthur George Tansley was an English botanist who coined the term ecosystem.
Ecosystem
Q22
Study of inter-relationships between organisms and their environment is
Correct Answer
Option A
Solution
(a) Ecology is the study of inter-relationship between organisms and their environment, coined by Ernst Haeckel.
Q23
Decomposers are organisms that
Correct Answer
Option D
Solution
(d) Decomposers act on dead bodies, converting complex organic constituents into simpler soluble form.
Q24
Bulk CO2 fixation occurs in
Correct Answer
Option B
Solution
(b) Due to the majority of phytoplankton.
Q25
Which of the following is the most stable ecosystem?
Correct Answer
Option D
Solution
(d) Oceans cover about 2/3rd of earth's surface and are the most stable due to buffering action of water.
Q26
The upright pyramid of number is absent in
Correct Answer
Option B
Solution
(b) In a forest, a single large tree supports many birds, giving an inverted pyramid of numbers.
Q27
If we completely remove the decomposers from an ecosystem, its functioning will be adversely affected, because
Correct Answer
Option C
Solution
(c) The decomposers break down dead organic matter into simpler compounds and minerals.
Q28
Niche of a species in an ecosystem refers to its
Correct Answer
Option A
Solution
(a) Niche is a specific part of the habitat determined by the functioning of the population.
Q29
The rate at which light energy is converted to the chemical energy of organic molecules is the ecosystem's
Correct Answer
Option B
Solution
(b) The rate at which organic molecules are formed in green plants is called gross primary productivity.
Q30
The greatest biomass of autotrophs in the oceans is that of
Correct Answer
Option B
Solution
(b) The greatest biomass of autotrophs in the oceans is free floating microalgae, cyanobacteria and nanoplankton.
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