1. A
   Polythene, Detergent, PVC
2. B
   Wood, Paper, Leather
3. C
   Plastic, Detergent, Grass
4. D
   Plastic, Bakelite, Cloth

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1. A
   Chemical treatment
2. B
   Physical treatment like sedimentation
3. C
   Passing ultraviolet radiations
4. D
   Biological treatment

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1. A
   (i), (ii), (iii) and (iv)
2. B
   (iii) and (iv) only
3. C
   (i), (ii) and (iii) only
4. D
   (ii) and (iv) only

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1. A
   Do not breakdown organic compounds
2. B
   Convert inorganic material to simpleforms
3. C
   Convert organic material to inorganic forms
4. D
   Convert inorganic materials into organic compounds

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1. A
   Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
2. B
   Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
3. C
   Both statements 1 and 2 are false
4. D
   Statement 1 is true and statement 2 is false.

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1. A
   Plumule
2. B
   Cotyledon
3. C
   Embryo
4. D
   Radicle

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1. A
   Recycling of plastic and paper
2. B
   Producing biogas from the organic wastes
3. C
   All of these
4. D
   Use of biodegradable products

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1. A
   1985
2. B
   1987
3. C
   1992
4. D
   1989

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1. A
   Crop field
2. B
   Forest
3. C
   Lake
4. D
   Pond

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1. A
   (i) and (iii) only
2. B
   (ii) and (iv) only
3. C
   (i), (iii) and (iv) only
4. D
   (ii) and (iv) only

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1. A
   Polythene
2. B
   Paper
3. C
   Aluminium foil
4. D
   Plastic

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1. A
   The population of tiger will decreaseand the growth of grass willincrease.
2. B
   The growthof grass will decrease.
3. C
   The population of tiger will increase.
4. D
   Tiger will start eating grass.

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1. A
   Forest ecosystem
2. B
   Cropland ecosystem
3. C
   Grassland ecosystem
4. D
   Pond ecosystem

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1. A
   Ecosystem
2. B
   Atmosphere
3. C
   Community
4. D
   Biosphere

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1. A
   Jute bag, Mouldy bread, Newspaper
2. B
   Cotton cloth, Mango fruit, Nylon wire
3. C
   Aluminium can, Keyboard, Plastic bag
4. D
   Orange peel, Metal key, Roti

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1. A
   all living organisms
2. B
   non-living objects
3. C
   sometimes living organisms and sometimes non-living objects
4. D
   both living organisms and non-living objects

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1. A
   0.1%
2. B
   10%
3. C
   100%
4. D
   1%

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1. A
   Diphenyl dichloro trichloroethane
2. B
   Dichloro diphenyl trichloroethane
3. C
   Dichloro diphenyl trichloroethyne
4. D
   Diphenyl dichloro trichloroethyne

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1. A
   Biomass
2. B
   Producers
3. C
   Solar energy
4. D
   Carbohydrates in plants

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1. A
   Sugarcane and rice
2. B
   Wheat and gram
3. C
   Wheat and sugarcane
4. D
   Wheat and rice

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1. A
   A producer cannot be eaten by more than two herbivores
2. B
   Transfer of energy from one trophic level to other is associated with energy loss
3. C
   There are limited number of organisms in an ecosystem
4. D
   Larger food chains increase complications of food web

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1. A
   Producers, consumers and decomposers
2. B
   Producers and primary consumers
3. C
   Producers, herbivores and carnivores
4. D
   Producers, carnivores and decomposers

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1. A
   (ii), (iii) and (iv) only
2. B
   (iii) only
3. C
   (ii) and (iv) only
4. D
   (i), (ii) and (iv) only

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1. A
   Plant→Man
2. B
   3Rs
3. C
   3Qs
4. D
   3As

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1. A
   Plant→Man
2. B
   Plant→Goat→Man
3. C
   Different equal energy in both food chain
4. D
   Equal energy in both food chain

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