Biology MCQs for Class 12 Chapter wise with Answers Download Free PDF: MCQs of biology class 12 Chapter 14 Ecosystem is very important for the students who want to get good marks in their CBSE RBSE NCERT Board Exams. Neet MCQ
MCQs of Biology Class 12 Chapter 14 Ecosystem with answers PDF Download
Question 1.
Who introduced term Ecosystem?
(a) Leaneous
(b) Reiter
(c) Odum
(d) Aristle
Answer: (b) Reiter
Question 2.
Soil developed from sedimented rock:
(a) Force Science
(b) Edaphology
(c) Pedogenesis
(d) All of these
Answer: (c) Pedogenesis
Question 3.
Best soil for plant growth is:
(a) Grit
(b) Sandy
(c) Soily
(d) Clay
Answer: (d) Clay
Question 4.
Soil particle determine the character of:
(a) Organisation
(b) Biomass
(c) Area capacity
(d) Soil plants
Answer: (a) Organisation
Question 5.
Plant roots soil water is:
(a) Cellular water
(b) Surface water
(c) Humidity water
(d) Gravitational water
Answer: (d) Gravitational water
Question 6.
Exchange of water in submerged plant:
(a) Stomata
(b) Normal surface
(c) Hydathode
(d) Lenticel
Answer: (b) Normal surface
Question 7.
Submerged Rooted Hydrophyte are:
(a) Uticularia
(b) Prapa
(c) Nymphea
(d) Vallisnaria
Answer: (d) Vallisnaria
Question 8.
Water co-deficient contains:
(a) Large thin walled cells
(b) Large-vacuoles
(c) Membrane
(d) All of these
Answer: (c) Membrane
Question 9.
Xerophyte Contains:
(a) Deep roots
(b) Sunken stomata
(c) Thick cuticle
(d) All of these
Answer: (d) All of these
Question 10.
Small extremite animals of tropicalregion:
(a) Allen’s law
(b) Bergmen’s law
(c) Dollo’s law
(d) Cope’s law
Answer: (d) Cope’s law
Question 11.
Hibernation of some animals:
(a) Regular
(b) Periodic
(c) Suddenly
(d) Temporary
Answer: (a) Regular
Question 12.
Physical and chemical properties of soil studied by :
(a) Climatic factor
(b) Biotic factor
(c) Soil factor
(d) Topographic factor
Answer: (b) Biotic factor
Question 13.
Identity the Hetero Organism:
(a) Pistia
(b) Hydrilla
(c) Vallisnaria
(d) Casurina
Answer: (c) Vallisnaria
Question 14.
That animal who can bear one third loss of water of one third body weight is:
(a) Necturus
(b) Camel
(c) Wall Lizzard
(d) Kyton
Answer: (b) Camel
Question 15.
Root hair absent in:
(a) Hydrophyte
(b) Halophyte
(c) Mesophyte
(d) Heliophyte
Answer: (a) Hydrophyte
Question 16.
A water co-efficient Mesophyte is:
(a) Cappais
(b) Agave
(c) Acacia
(d) Hemeris
Answer: (b) Agave
Question 17.
Gravitated carried soil is:
(a) Alluvial
(b) Muddy
(c) Glacier
(d) Compound
Answer: (d) Compound
Question 18.
Kanha National Park is famous for:
(a) For Birds
(b) For Tendua
(c) For Tiger
(d) For Crocodile
Answer: (b) For Tendua
Question 19.
During food chain the maximum energy is stored in :
(a) Producers
(b) Decomposers
(c) Herbivoures
(d) Camivourse
Answer: (a) Producers
Question 20.
The average efficiency of energy transfer from herbivoure to carnivorce level is :
(a) 5%
(b) 10%
(c) 20%
(d) 30%
Answer: (b) 10%
Question 21.
Ecological pyramids were first devised by:
(a) Charles Eltom
(b) R. Hesse
(c) R.A. Lindemann
(d) Justus von Liebig
Answer: (a) Charles Eltom
Question 22.
Which of the following ecosystem has highest gross primary productivity:
(a) Grassland
(b) Coral reefs
(c) Mangrooves
(d) Rainforests
Answer: (b) Coral reefs
Question 23.
In the phosphorus cycle, weathring makes phosophate available first to:
(a) Producers
(b) Decomposers
(c) Consumers
(d) None of these
Answer: (a) Producers
Question 24.
Which types of the following pyramid are never inverted?
(a) Pyramid of energy
(b) Pyramid of biomass
(c) Pyramid of number
(d) Pyramid of dry biomass
Answer: (a) Pyramid of energy
Question 25.
Biosphere means:
(a) Atmosphere
(b) Lithosphere and ionosphered
(c) Atmosphere, lithosphere and hydrosphere
(d) Hydrosphere lithosphere and ionsophere
Answer: (c) Atmosphere, lithosphere and hydrosphere
More MCQs for class 12 Biology Chapter 14
Question 1.
Given below is one of the types of ecological pyramids. This type represents
(a) Pyramid of numbers in a grassland
(b) Pyramid of biomass in a follow land
(c) Pyramid of biomass in a lake
(d) Energy pyramid in a spring
Answer: (c) Pyramid of biomass in a lake
Question 2.
Energy transferred from one trophic level to another
(a) 5%
(b) 10%
(c) 15%
(d) 20%
Answer: (b) 10%
Question 3.
Maximum absorption of rainfall water is done by
(a) Tropical deciduous forest
(b) Tropical evergreen forest
(c) Tropical savannah
(d) Scrule forest
Answer: (b) Tropical evergreen forest
Question 4.
Which of the following is called as a detrivore?
(a) An animal feeding on decaying organic matter
(b) An animal feeding on a plant
(c) A plant feeding on an animal
(d) An animal feeding on another animal
Answer: (a) An animal feeding on decaying organic matter
Question 5.
The pyramid of energy is always upright for any ecosystem. This situation indicates the fact that:
(a) producers have the lowest energy conversion efficiency
(b) carnivores have a better energy conversion efficiency
(c) energy, conversion efficiency is the same in all trophic levels
(d) herbivores have a better energy conversion efficiency than carnivores.
Answer: (d) herbivores have a better energy conversion efficiency than carnivores.
Question 6.
Which of the following pairs is mismatched?
(a) Tundra-permafrost
(b) Savanna-Acacia trees
(c) Praire-epiphytes
(d) Coniferous forest-evergreen trees
Answer: (c) Praire-epiphytes
Question 7.
The most abundant element present in the plants is
(a) nitrogen
(b) manganese
(c) iron
(d) carbon
Answer: (d) carbon
Question 8.
These belong to the category of primary consumers
(a) Insects and cattle
(b) Eagle and snakes
(c) Water insects
(d) Snakes and frogs
Answer: (a) Insects and cattle
Question 9.
Which of the following is expected to have the highest value (gm/m²/yr) in a grassland ecosystem?
(a) Tertiary production
(b) Gross production
(c) Net production
(d) Secondary production
Answer: (b) Gross production
Question 10.
Largest reservoir of sulphur is
(a) Atmosphere
(b) Rocks
(c) Ocean
(d) Lake
Answer: (b) Rocks
Question 11.
Maximum productivity is found in
(a) Grassland
(b) Desert
(c) Ocean
(d) Tropical rain forest
Answer: (c) Ocean
Question 12.
Concentration of nitrogen remains constant by
(b) Nitrogen cycle
(b) Thundering and lightning
(c) Enzymes
(d) Both (a) and (b)
Answer: (d) Both (a) and (b)
Question 13.
In the phosphorus cycle, phosphate becomes available by weathering of rocks first to
(a) Consumers
(b) Producers
(c) Decomposers
(d) None of these
Answer: (b) Producers
Question 14.
If there was no CO2 in the earth’s atmosphere, the temperature of the earth’s surface would be
(a) Same as the present
(b) Less than the present
(c) Higher than the present
(d) Depends on the amount of O2 in the atmosphere
Answer: (b) Less than the present
Question 15.
Bacterial role in carbon cycle is
(a) Chemosynthesis
(b) Photosynthesis
(c) Breakdown of organic matter
(d) Assimilation of nitrogen compounds
Answer: (c) Breakdown of organic matter
Question 16.
Which important greenhouse gas, other than methane is being produced from the agricultural fields?
(a) Arsine
(b) Sulphur dioxide
(c) Ammonia
(d) Nitrous oxide
Answer: (d) Nitrous oxide
Question 17.
Zone of atmosphere near the ground is
(a) Troposphere
(b) Stratosphere
(c) Homosphere
(d) All of these
Answer: (a) Troposphere
Question 18.
CO2 content of atmosphere is about
(a) 6.5%
(b) 3.334%
(c) 0.34%
(d) 0.034%
Answer: (d) 0.034%
Question 19.
Ultraviolet radiation from sunlight causes a reaction which produces
(a) O3
(b) SO2
(c) CO
(d) CH4
Answer: (a) O3
Question 20.
Mr. X is eating curd/yoghurt. For this food intake in a food chain he should be considerd as Occupying
(a) First trophic level
(b) Second trophic level
(c) Third trophic level
(d) Fourth trophic level
Answer: (b) Second trophic level
