CBSE Class 12 Biology – MCQ and Online Tests – Unit 14 – Ecosystem
Every year CBSE conducts board exams for 12th standard. These exams are very competitive to all the students. So our website provides online tests for all the 12th subjects. These tests are also very effective and useful for those who preparing for competitive exams like NEET, JEE, CA etc. It can boost their preparation level and confidence level by attempting these chapter wise online tests.
These online tests are based on latest CBSE Class 12 syllabus. While attempting these our students can identify the weak lessons and continuously practice those lessons for attaining high marks. It also helps to revise the NCERT textbooks thoroughly.
CBSE Class 12 Biology – MCQ and Online Tests – Unit 14 – Ecosystem
Question 1.
Plant roots soil water is:
(a) Cellular water
(b) Surface water
(c) Humidity water
(d) Gravitational water
Answer
Answer: (d) Gravitational water
Question 2.
Submerged Rooted Hydrophyte are:
(a) Uticularia
(b) Prapa
(c) Nymphea
(d) Vallisnaria
Answer
Answer: (d) Vallisnaria
Question 3.
Xerophyte Contains:
(a) Deep roots
(b) Sunken stomata
(c) Thick cuticle
(d) All of these
Answer
Answer: (d) All of these
Question 4.
Soil particle determine the character of:
(a) Organisation
(b) Biomass
(c) Area capacity
(d) Soil plants
Answer
Answer: (a) Organisation
Question 5.
Soil developed from sedimented rock:
(a) Force Science
(b) Edaphology
(c) Pedogenesis
(d) All of these
Answer
Answer: (c) Pedogenesis
Question 6.
Who introduced term Ecosystem?
(a) Leaneous
(b) Reiter
(c) Odum
(d) Aristle
Answer
Answer: (b) Reiter
Question 7.
Small extremite animals of tropicalregion:
(a) Allen’s law
(b) Bergmen’s law
(c) Dollo’s law
(d) Cope’s law
Answer
Answer: (d) Cope’s law
Question 8.
Identity the Hetero Organism:
(a) Pistia
(b) Hydrilla
(c) Vallisnaria
(d) Casurina
Answer
Answer: (c) Vallisnaria
Question 9.
Hibernation of some animals:
(a) Regular
(b) Periodic
(c) Suddenly
(d) Temporary
Answer
Answer: (a) Regular
Question 10.
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
Answer: (b) Camel
Question 11.
The average efficiency of energy transfer from herbivoure to carnivorce level is :
(a) 5%
(b) 10%
(c) 20%
(d) 30%
Answer
Answer: (b) 10%
Question 12.
Exchange of water in submerged plant:
(a) Stomata
(b) Normal surface
(c) Hydathode
(d) Lenticel
Answer
Answer: (b) Normal surface
Question 13.
Physical and chemical properties of soil studied by :
(a) Climatic factor
(b) Biotic factor
(c) Soil factor
(d) Topographic factor
Answer
Answer: (b) Biotic factor
Question 14.
Root hair absent in:
(a) Hydrophyte
(b) Halophyte
(c) Mesophyte
(d) Heliophyte
Answer
Answer: (a) Hydrophyte
Question 15.
A water co-efficient Mesophyte is:
(a) Cappais
(b) Agave
(c) Acacia
(d) Hemeris
Answer
Answer: (b) Agave
Question 16.
Kanha National Park is famous for:
(a) For Birds
(b) For Tendua
(c) For Tiger
(d) For Crocodile
Answer
Answer: (b) For Tendua
Question 17.
During food chain the maximum energy is stored in :
(a) Producers
(b) Decomposers
(c) Herbivoures
(d) Camivourse
Answer
Answer: (a) Producers
Question 18.
Ecological pyramids were first devised by:
(a) Charles Eltom
(b) R. Hesse
(c) R.A. Lindemann
(d) Justus von Liebig
Answer
Answer: (a) Charles Eltom
Question 19.
Gravitated carried soil is:
(a) Alluvial
(b) Muddy
(c) Glacier
(d) Compound
Answer
Answer: (d) Compound
Question 20.
Which of the following ecosystem has highest gross primary productivity:
(a) Grassland
(b) Coral reefs
(c) Mangrooves
(d) Rainforests
Answer
Answer: (b) Coral reefs
Question 21.
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
Answer: (a) Pyramid of energy
Question 22.
Best soil for plant growth is:
(a) Grit
(b) Sandy
(c) Soily
(d) Clay
Answer
Answer: (d) Clay
Question 23.
Water co-deficient contains:
(a) Large thin walled cells
(b) Large-vacuoles
(c) Membrane
(d) All of these
Answer
Answer: (c) Membrane
Question 24.
Which one of the following is not used for construction of ecological pyramid?
(a) Dry weight
(b) Number of individuals
(c) Rate of energy flow
(d) Fresh weight
Answer
Answer: (a) Dry weight
Question 25.
Biosphere means:
(a) Atmosphere
(b) Lithosphere and ionosphered
(c) Atmosphere, lithosphere and hydrosphere
(d) Hydrosphere lithosphere and ionsophere
Answer
Answer: (c) Atmosphere, lithosphere and hydrosphere
Question 26.
In the phosphorus cycle, weathring makes phosophate available first to:
(a) Producers
(b) Decomposers
(c) Consumers
(d) None of these
Answer
Answer: (a) Producers
Question 27.
Best type of pyramid which is always true is:
(a) Pyramid or energy
(b) Pyramid of Biomass
(c) Pyramid of number
(d) Both (a) and (c)
Answer
Answer: (a) Pyramid or energy
Question 28.
The largest ecosystem is :
(a) Forest ecosystem
(b) Marine ecosystem
(c) Pond ecosystem
(d) Grassland ecosystem
Answer
Answer: (b) Marine ecosystem
Question 29.
Ecology deals with:
(a) The arth and plants
(b) The relationship between organisms and their environment
(c) Economical growth of poor people
(d) The life under sea
Answer
Answer: (b) The relationship between organisms and their environment
Question 30.
More than 70 of world freshwater is contain in:
(a) Antarctica
(b) Glaciers and mountains
(c) Greenland
(d) Polar ice
Answer
Answer: (c) Greenland
Question 31.
Decomposers are:
(a) Autotrophs
(b) Autohetrotrophs
(c) Organotrophs
(d) Heterotrophs
Answer
Answer: (d) Heterotrophs
Question 32.
Which one of the following pair is mismatched?
(a) Prairies-Epiphytes
(b) Tundra-Permafrost
(c) Savannaha-Acacia trees
(d) Coniferous forests-Evergreen trees)
Answer
Answer: (a) Prairies-Epiphytes
Question 33.
Which of the following is the most stable ecosystem?
(a) Mountain
(b) Desert
(c) Forest
(d) Ocean
Answer
Answer: (b) Desert
Question 34.
What is the main cause of extinction of some species in tropical forests?
(a) Deforestation
(b) Afforestation
(c) Pollution
(d) Soil erosion
Answer
Answer: (a) Deforestation
Question 35.
Primary succession occurs in :
(a) Primary succession occurs
(b) Previously unoccupied area
(c) Both of the above
(d) None of these
Answer
Answer: (b) Previously unoccupied area
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