Some Major Ecosystems Class 12 MCQ: Class 12 Biology MCQ Questions and Answer. Students get here all Important MCQ on Some Major Ecosystems Class 12.
Some Major Ecosystems Class 12 MCQ with Answers:
(1) Which is the Simplest aquatic ecosystem?
(a) Pond
(b) Stream
(c) Lake
(d) Marine
Ans: (a) Pond
(2) Beach is classified into which ecosystem?
(a) Lake ecosystem
(b) Seashore ecosystem
(c) Pond ecosystem
(d) River ecosystem
Ans: (b) Seashore ecosystem
(3) Which is the lowest ecosystem on Earth?
(a) Desert
(b) forest
(c) Grassland
(d) Oceans
Ans: (d) Oceans
(4) Which ecosystem is known giant permanent pord?
(a) Lake ecosystem
(b) Pond ecosystem
(c) Seashore ecosystem
(d) Marine ecosystem
Ans: (a) Lake ecosystem
(5) Autotrophs producers synthesise their own food themselves through
(a) Glycolysis
(b) metabolism
(c) Photosynthesis
(d) Catebolism
Ans: (c) Photosynthesis
(6) Which of the following are plant eating organism
(a) Insects
(b) Goat
(c) Rabbit
(d) All of them
Ans: (d) All of them
(7) Which of the following are tertiary consumers?
(a) Cat
(b) Tigers
(c) Deer
(d) Horse
Ans: (b) Tigers
(8) The living organisms in an ecosystem together from its community is known as
(a) A biotic Component
(b) biotic component
(c) A biotic Community
(d) Non – living community
Ans: (b) biotic component
(9) The productivity of an ecosystem is indicated by
(a) Number of plants in that ecosystem
(b) The density of that ecosystem
(c) Consumption & Carbon dioxide & evolve of Oxygen
Ans:
(10) In polluted lake which organisms dominate the community?
(a) Fish
(b) Crustaceans
(c) Phytoplanktons
(d) Blue green algae
Ans: (d) Blue green algae
(11) Development of bark in plants & skin in animals is a method for
(a) Providing Support
(b) Protection from enemies
(c) Reducing water loss
(d) Helping in food product
Ans: (c) Reducing water loss
(12) Mountains of Koh Hindukush come under
(a) Tundra
(b) Grassland
(c) Tropical forests
(d) Temperate deciduous
Ans: (a)Tundra
(13) End of earth is related to
(a) Tropical rainforest
(b) Temperature deciduous forests
(c) Savanna
(d) Tundra
Ans: (d) Tundra
(14) Evolution of Vascular bundles in plants & Skeleton in animals is an adaption for
(a) Hdrospheric ecosystem
(b) Aquatic ecosystem
(c) Terrestrial ecosystem
(d) All of these
Ans: (c) Terrestrial ecosystem
(15) Annual rainfall is grassland is
(a) 1500 – 2500 mm
(b) 750 – 1500 mm
(c) 250 – 750 mm
(d) 250 – 500 mm
Ans: (c) 250 – 750 mm
(16) Temperature of temperate deciduous forests is
(a) 4 – 30°C
(b) 45 – 50°C
(c) 20 – 25°C
(d) 5 – 10°C
Ans: (a) 4 – 30°C
(17) Grassland in tropic climates with woody tress is called
(a) Prairies
(b) Savanna
(c) Boreal
(d) Alpines
Ans: (b) Savanna
(18) Annual rainfall in deserts is less than
(a) 150 – 200 mm
(b) 500 – 700 mm
(c) 250 – 500 mm
(d) 700 – 800 mm
Ans: (c) 250 – 500 mm
(19) One of the most important cause of desertification is
(a) floods
(b) Wind blowing
(c) Raining
(d) Deforestation
Ans: (d) Deforestation
(20) In which Zone plant community is most diverse
(a) Limnetic Zone
(b) Littoral Zone
(c) Profundal Zone
(d) All of these
Ans: (b) Littoral Zone
(21) Which statement about the hydrospheric ecosystem is incorrect
(a) Salt water Ocean & Sea are the largest ecosystem on earth
(b) Saltwater ecosystem covers above 75% earth surface
(c) freshwater ecosystem covers less than 1% of earth surface
(d) It temperature is more moderate to support life
Ans: (b) Saltwater ecosystem covers above 75% earth surface
(22) Energy —- in an Ecosystem
(a) is released
(b) is absorbed
(c) flows
(d) None of the above
Ans: (c) flows
(23) The set & ecosystem is called a
(a) Biome
(b) Climate
(c) Subsystem
(d) Structure
Ans: (a) Biome
(24) Humus is ____ factor of an Ecosystem
(a) Physical
(b) Chemical
(c) Both (a) & (b)
(d) None of the above
Ans: (b) Chemical
(25) Autotrophic components are
(a) Producers
(b) Consumers
(c) Decomposers
(d) None of the above
Ans: (a) Producers
(26) Grasshopper is a
(a) Herbivore
(b) Carnivore
(c) Omnivore
(d) None of the above
Ans: (a) Herbivore
(27) A Wide variety of living organisms is called
(a) Biodiversity
(b) Population
(c) Habitat
(d) Diversity
Ans: (a) Biodiversity
(28) ____ is a group of species exploits the biotic & a biotic resources in the same way
(a) Community
(b) Ecads
(c) Biomes
(d) Guild
Ans: (d) Guild
(29) What reduces the capability of blood to carry Oxygen?
(a) Hemodilution
(b) Anemia
(c) Thalassemia
(d) All of above
Ans: (c) Thalassemia
(30) Acid deposited in rain & Snow is known as
(a) Wet Deposition
(b) Dry Deposition
(c) Acid rain
(d) Rain Depolorization
Ans: (a) Wet Deposition
(31) The balanced stability & existence of all oviavism in the environment is known as
(a) Ecological Community
(b) Equilibrium
(c) Dis – Climaxe Community
(d) Climax Community
Ans: (a) Ecological Community
(32) What helps the atmosphere hooked up to the earth
(a) Gravity
(b) magnetic rays
(c) Electromagnetic radiant
(d) All of the above
Ans: (a) Gravity
(33) Which layer of the atmosphere do clouds, Stroms & wind occur in?
(a) Stratosphere
(b) Mesosphere
(c) Thermosphere
(d) Troposphere
Ans: (d) Troposphere
(34) The presence of Hydrogen Sulphide indicate anaerobic?
(a) Decomposition
(b) Eutrophication
(c) Degradation
(d) Biodegradation
Ans: (a) Decomposition
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