Q.1
Source of energy in ecosystem is .... .... [C.P.M.T.2002]
  • a) Sun
  • b) Sugar produced in photosynthesis
  • c) Green plants
  • d) ATP
Q.2
Percentage of precipitation that can be stored in dams of India is .... .... [D.P.M.T 2009]
  • a) 10
  • b) 18
  • c) 43
  • d) 55
Q.3
A rat feeding on potato tuber is .... .... [K.C.E.T.1999]
  • a) Producer
  • b) Primary consumer
  • c) Carnivore
  • d) Decomposer
Q.4
Least porous soil is .... .... [D.P.M.T 2009]
  • a) Silt soil
  • b) Peat soil
  • c) Clay soil
  • d) Loam soil
Q.5
An ecosystem is .... .... [M.P.PM.T.1992]
  • a) Different communities of plants, animals and microbes together with their physico-chemical environments
  • b) Different communities of plants and microbes alongwith their physico-chemical environments.
  • c) A localized assemblage of several plants and animals
  • d) An assemblage of plants, animals and their surroundings
Q.6
Energy enters an ecosystem through ..... .... [C.P.M.T.1998]
  • a) Herbivores
  • b) Producers
  • c) Carnivores
  • d) Decomposers
Q.7
Pyramid of energy is .... .... [A.M.U.2010]
  • a) Always inverted
  • b) Always upright
  • c) Spindle-shaped
  • d) Both upright and inverted depending upon ecosystem
Q.8
The upright pyramid of number is absent in ... ... [C.B.S.E. 2012]
  • a) Lake
  • b) Forest
  • c) Grassland
  • d) Pond
Q.9
Crop rotation is employed for .... .... [C.P.M.T.2003]
  • a) Increasing nitrogen content of soil
  • b) Checking soil erosion
  • c) Community development
  • d) Enhancing soil fertility
Q.10
Sidartha found a vegetarian fields mouse being swallowed by snake which in turn formed the meal for a hawk. what is the position of snake in the food chain? .... .... [C.P.M.T.1990]
  • a) Producer
  • b) Primary consumer
  • c) secondary consumer
  • d) tertiary consumer
Q.11
Phytoplankton is component of .... .... [Bihar.P.M.T.2001]
  • a) Pond ecosystem
  • b) Desert ecosystem
  • c) Grass ecosystem
  • d) Forest ecosystem
Q.12
Highest annual net primary productivity is of .... .... [M.P.P.M.T.2010]
  • a) Tropical deciduous forests
  • b) Temperate evergreen forest
  • c) Temperate deciduous forest
  • d) Tropical rain forest
Q.13
Most primary productivity of pond is by .... ..... [Manipal 2004]
  • a) Phytoplankton
  • b) Zooplankton
  • c) Floating plants
  • d) Red algae
Q.14
Percentage of forest cover recommended by National Forest Policy (1988) is .... .... [Kerala 2009]
  • a) 30% in plains, 60% in hills
  • b) 20% in plains, 70% in hills
  • c) 33% in plains, 67% in hills
  • d) 37% in plains, 67% in hills
Q.15
CO2 and O2 balance in atmosphere is due to .... .... [Bih.P.M.T.1995]
  • a) Photosynthesis
  • b) Respiration
  • c) Leaf anatomy
  • d) Photorespiration
Q.16
Bioindicators are used for knowing .... .... [M.P.P.M.T. 2007]
  • a) Minerals
  • b) Oxygen demand
  • c) Air pollution
  • d) All
Q.17
Stability of ecosystem depends upon .... ..... [C.P.M.T.2007]
  • a) Primary productivity
  • b) Number of producers
  • c) Number of consumers
  • d) Interchange between producers and consumers
Q.18
If CO2 is removed totally from the biosphere which organisms will be affected first .... .... [Manipur 2009]
  • a) Consumers
  • b) Secondary consumers
  • c) Producers
  • d) Primary producers
Q.19
A characteristic of mangroves is .... .... [A.M.U.2003]
  • a) Vivipary
  • b) Pneumatophores
  • c) Supporting roots
  • d) All
Q.20
Which communities are more vulnerable to invasion by outside plants and animals? .... ..... [C.B.S.E. 1998]
  • a) Tropical evergreen forests
  • b) Temperate forests
  • c) Mangroves
  • d) Oceanic island communities
Q.21
In food web, hyenas and vultures are .... .... [M.P.P.M.T.2004]
  • a) Primary consumers
  • b) Predators
  • c) Scavengers
  • d) Decomposers
Q.22
The principal cation in alkaline soil is .... .... [M.P.P.M.T. 2011]
  • a) Na+
  • b) K+
  • c) Ca2+
  • d) Any of the above
Q.23
Decomposers are .... .... [C.B.S.E.2001]
  • a) Animalia and Monera
  • b) Protista and Animalia
  • c) Fungi and Plantae
  • d) Bacteria and Fungi/Microorganisms
Q.24
Social forestry is useful in yielding .... .... [Pb P.M.T. 2003]
  • a) Floriculture
  • b) Timber
  • c) Medicines
  • d) Multipurpose uses.
Q.25
Grassland with scattered trees in .... .... [M.P.P.M.T.2004]
  • a) Savannah
  • b) Deciduous forest
  • c) Evergreen forest
  • d) Tropical rain forest
Q.26
After Na,K and Cl sea water has higher concentration of .... .... [A.M.U. 2001]
  • a) Mg
  • b) Zn
  • c) Ca
  • d) Pb
Q.27
Tropical deciduous forest trees shed their leaves to .... .... [Kerala 2003]
  • a) Protect themselves from heat
  • b) Save energy
  • c) Enhance rate of respiration
  • d) Prevent loss of water
Q.28
Which one statement for pyramid of energy is incorrect .... .... [C.B.S.E.2011]
  • a) Inverted in shape
  • b) Upright in shape
  • c) Base in broad
  • d) Shows energy content of different trophic levels
Q.29
If we remove half of the forest cover of earth, the crisis that will occur .... .... [C.B.S.E. 1996]
  • a) Many species would become extinct
  • b) Population, pollution and ecological imbalance will rise
  • c) Energy crisis will commence
  • d) The remaining forest will correct the imbalance
Q.30
A recently discovered ecosystem is .... .... [C.E.T.Chd2000]
  • a) Crater
  • b) Tundra
  • c) Floating iceberg
  • d) Vent
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