Topic wise MCQ test for MHT-CET and NEET
13. Organisms and Populations
(1) Which factor of an ecosystem
includes plants, animals and microorganisms ?
(a) Biotic factor
(b) Abiotic factor
(c) Direct factor
(d) Indirect
factor
Answer:- (a) Biotic factor
(2) A n assemblage of individuals of
different species living in the same habitat and having functional
interactions is .......... .
(a) Biotic
community
(b) Ecological
niche
(c) Population
(d) Ecosystem
Answer:-
(a) Biotic community
(3) Association between sea anemone
and Hermit crab in gastropod shell is that of .......... .
(a) Mutualism
(b) Commensalism
(c) Parasitism
(d) Amensalism
Answer:- (b) Commensalism
(4) Select the statement which
explains best parasitism.
(a) One species is
benefited.
(b) Both the
species are benefited.
(c) One species is
benefited, other is not affected.
(d) One species is
benefited, other is harmed.
Answer:-
(d) One species is benefited, other is harmed.
(5) Growth of bacteria in a newly
inoculated agar plate shows .......... .
(a) exponential
growth
(b) logistic
growth
(c) Verhulst-Pearl
logistic growth
(d) zero growth
Answer:-
(c) Verhulst-Pearl logistic growth
(6) All ecosystems on the earth
together form .......... .
(a) biosphere
(b) biome
(c) living world
(d) environment
Answer:-
(a) biosphere
(7) What is the mean annual
temperature in the region of Arctic and Alpine tundra ?
(a) About –10 to 2
°C
(b) About –2 to 2
°C
(c) About 0 to 5
°C
(d) About 5 to 10
°C
Answer:-
(a) About –10 to 2 °C
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(8) Which out of the following are
the major biomes in India?
|
(I) Desert |
(II) Grassland |
|
(III) Tropical rain forest |
(IV) Temperate forest |
|
(V)Coniferous forest |
(VI) Deciduous Forest |
|
(VII) Sea coast |
(VIII)Tundra |
(a) (II) (IV) (VI)
(VII)
(b) (I) (II) (V)
(VIII)
(c) (I) (III) (VI)
(VII)
(d) (II) (III)
(VI) (VIII)
Answer:-
(c) (I) (III) (VI) (VII)
(9) Important key elements that bring
about variations in the different habitats are ..........
(a) temperature,
water, light and soil
(b) salinity,
pollutants, water
(c) modern
developmental parameters in the region
(d) scientific
progress and technological innovations
Answer:-
(a) temperature, water, light and soil
(10) Which out of the following is
the most ecologically relevant factor ?
(a) Water
(b) Temperature
(c) Salinity
(d) Wind speed
Answer:-
(b) Temperature
(11) Animals that can tolerate a
narrow range of temperature are ..........
(a) stenothermal
(b) eurythermal
(c) poikilothermic
(d) homeothermic
Answer:-
(a) stenothermal
(12) Animals that can tolerate a
narrow range of salinity are ..........
(a) euryhaline
(b) anadromous
(c) catadromous
(d) stenohaline
Answer:-
(d) stenohaline
(13) What is the source of energy in
the depths of more than 500 m in the oceans ?
(a) Sunlight
(b) Wind energy
(c) Dead and
decaying matter
(d) Phytoplankton
Answer:-
(c) Dead and decaying matter
(14) Which factor does not determine
percolation and water holding capacity of the soil ?
(a) Soil
composition
(b) Grain size
(c) Aggregation of
soil particles
(d) Vegetation on
that soil
Answer:-
(d) Vegetation on that soil
(15) Which factors of soil does not
determine the vegetation in any area ?
(a) pH
(b) mineral
composition
(c) topography
(d) types of
microorganisms
Answer:-
(d) types of microorganisms
(16) Find the odd one out:
(a) Dormancy
(b) Hibernation
(c) Aestivation
(d) Migration
Answer:-
(d) Migration
(17) Which of the following ability
is present in the desert animals?
(a) Ability to
concentrate urine.
(b) Ability to
remain inside the shelters and escape need of water.
(c) Ability to
derive water from all the fruits.
(d) Ability to
absorb water from air.
Answer:- (a) Ability to
concentrate urine.
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(18) Which of the statement does not
describe the adaptation of the desert plants ?
(a) Desert plants
have a thick cuticle on their leaf surfaces.
(b) Desert plants
have their stomata arranged in sunken pits.
(c) Desert plants
have a special photosynthetic pathway called CAM.
(d)
Desert plants have soft stems and large leaves.
Answer:-
(d) Desert plants have soft stems and
large leaves.
(19)
What is the use of CAM type of photosynthetic pathway for the desert plants ?
(a)
It enables their stomata to remain closed during day time.
(b)
It requires less sunlight for the photosynthesis.
(c)
It requires less amount of chlorophyll during photosynthesis.
(d)
The water absorbed from the soil by the plants during CAM photosynthetic
pathway is less.
Answer:-
(a) It enables their stomata to remain
closed during day time.
(20)
In which plant photosynthetic function is taken over by the flattened stems ?
(a)
Nephrolepis
(b)
Cycas
(c)
Opuntia
(d)
Zea mays
Answer:-
(c) Opuntia
(21)
What is Allen’s rule ?
(a)
Mammals from colder climates generally have shorter ears and limbs to minimise
heat loss.
(b)
Mammals have constant temperature of the body in spite of their varied
habitats.
(c)
Mammals can be oviparous at times.
(d)
The ecosystem of cold climate regions is equally occupied with mammals, birds
and reptiles.
Answer:-
(a) Mammals from colder climates generally
have shorter ears and limbs to minimise heat loss.
(22)
Sunken stomata is the characteristic feature of ..........
(a)
hydrophyte
(b) mesophyte
(c)
xerophyte
(d)
halophyte
Answer:-
(c) xerophyte
(23)
Which of the following pairs is correctly matched ?
(a)
Uricotelism – aquatic habitat
(b)
Parasitism – intra-specific relationship
(c)
Excessive perspiration – xeric adaptation
(d)
Stream-lined body – aquatic adaptation
Answer:-
(d) Stream-lined body – aquatic adaptation
(24)
World population day is observed on .......... .
(a)
11th July
(b)
16th September
(c) 23rd October
(d)
1st December
Answer:-
(a) 11th July
(25) World Environment day is
celebrated on .......... .
(a) 22nd April
(c)
1st October
(d)
16th November
Answer:-
(b) 5th June
(26) World Earth day is observed on ..........
.
(a) 22nd April
(b) 5th June
(c) 1st October
(d) 16th November
Answer:-
(a) 22nd April
(27) World ozone day is celebrated on
.......... .
(a) 5th June
(b)16th September
(c) 1st October
(d) 23rd October
Answer:-
(b)16th September
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(28) A group of individuals belonging
to the same species within an ecosystem is called a .......... .
(a) community
(b) habitat
(c) population
(d) specific group
Answer:-
(c) population
(29) The populations of different
species that live and interact together in the ecosystem are called…
(a) community
(b) habitat
(c) population
(d) interspecies
Answer:-
(a) community
(30) If .......... do not occur in an
ecosystem, the survival of organisms may not take place and functioning of
ecosystem is lost.
(a) interactions
(b) struggle
(c) reproduction
(d) none of the
above
Answer:-
(a) interactions
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