Our Environment

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

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1. A.
   Producers
2. B.
   Herbivores
3. C.
   Carnivores
4. D.
   Omnivores

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1. A.
   Ozone is a molecule formed by three atoms of oxygen.
2. B.
   Ozone shields earth’s surface from harmful infrared radiations.
3. C.
   CFC’s are linked to decline of $\mathrm{O_3}$ layer in our atmosphere.
4. D.
   Ozone at higher levels is a product of UV radiations acting on oxygen molecule.

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1. A.
   Food web
2. B.
   Ecosystem
3. C.
   Ecological pyramid
4. D.
   Food chain

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1. A.
   Small aquatic plants
2. B.
   Human beings
3. C.
   Small fish
4. D.
   Large fish

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1. A.
   Snake and Grasshopper
2. B.
   Grass and tree
3. C.
   Lizard and elephant
4. D.
   Bacteria and grass

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1. A.
   Paper
2. B.
   DDT
3. C.
   Wood
4. D.
   Vegetable peel

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1. A.
   T1
2. B.
   T5
3. C.
   T4
4. D.
   T3

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1. A.
   Availability of water
2. B.
   Deficient food supply
3. C.
   Decrease in energy at higher levels
4. D.
   Pollution in air

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1. A.
   Vegetable peels, dead leaves, paper
2. B.
   Cow dung, leather bag, water
3. C.
   Polythene bag, rubber band, ball pen
4. D.
   Paper, fruits, bones

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1. A.
   Convert inorganic materials to simpler forms
2. B.
   Break down complex organic substances to simple inorganic substances.
3. C.
   Break down inorganic substances into organic substances.
4. D.
   Do not act on organic compounds.

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

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both, Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both, Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Forests and ponds
2. B.
   Crop fields and lakes
3. C.
   Lakes and gardens
4. D.
   Crop fields and forests

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

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1. A.
   0.5 kJ
2. B.
   5 kJ
3. C.
   500 kJ
4. D.
   5000 kJ

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1. A.
   Grass $\rightarrow$ Grasshopper $\rightarrow$ Frog $\rightarrow$ Snake
2. B.
   Plants $\rightarrow$ Deer $\rightarrow$ Lion
3. C.
   Plants $\rightarrow$ Man
4. D.
   Phytoplankton $\rightarrow$ Zooplankton $\rightarrow$ Small Fish $\rightarrow$ Big Fish

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1. A.
   Leather footwear, Plastic plate, Polythene bag
2. B.
   Empty medicine bottle, Milk packet, Aluminium can
3. C.
   Used tea leaves, Cardboard box, Iron nail
4. D.
   Plastic Syringes, Newspaper, Ball point pen

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1. A.
   exist over a large area.
2. B.
   have very less concentration of harmful chemicals.
3. C.
   have to feed large number of herbivores.
4. D.
   can synthesize food by photosynthesis.

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1. A.
   Leather, Glass, Plastic
2. B.
   Cotton, Wood, Nylon
3. C.
   DDT, Polyester, Glass
4. D.
   Leather, Silk, Wool

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1. A.
   minimising the use of chloroflurocarbons.
2. B.
   excessive use of disposable cups and plates.
3. C.
   maximising the use of reusable utensils for eating food and drinking fluids.
4. D.
   segregating the wastes into biodegradable and non-biodegradable before disposal.

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1. A.
   1%
2. B.
   10%
3. C.
   90%
4. D.
   99%

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1. A.
   It is a deadly poisonous gas.
2. B.
   It shields the surface of the earth from UV radiation from sun.
3. C.
   It is used as a refrigerant and in fire-extinguishers.
4. D.
   It is formed by combining oxygen molecule with free oxygen atom.

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

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1. A.
   Carbon monoxide
2. B.
   CFC’s
3. C.
   DDT
4. D.
   Manure

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true and Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   control $\mathrm{CO_2}$ emissions in the environment
2. B.
   conserve biodiversity
3. C.
   control water pollution
4. D.
   reduce CFC production

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1. A.
   2 trophic levels
2. B.
   3 trophic levels
3. C.
   4 trophic levels
4. D.
   5 trophic levels

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1. A.
   Grass, goat, lion
2. B.
   Zooplankton, Phytoplankton, small fish, large fish
3. C.
   Tiger, grass, snake, frog
4. D.
   Grasshopper, grass, snake, frog, eagle

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

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

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1. A.
   (a) and (b)
2. B.
   (a) and (c)
3. C.
   (b) and (c)
4. D.
   (b) and (d)

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both (A) and (R) are true and (R) is the correct explanation of (A).
2. B.
   Both (A) and (R) are true and (R) is not correct explanation of (A).
3. C.
   (A) is true, but (R) is false.
4. D.
   (A) is false, but (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both (A) and (R) are true and (R) is the correct explanation of (A).
2. B.
   Both (A) and (R) are true and (R) is not correct explanation of (A).
3. C.
   (A) is true, but (R) is false.
4. D.
   (A) is false, but (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Mice and Bear
2. B.
   Rabbit and Cat
3. C.
   Rabbit and Fox
4. D.
   Mice and Rabbit

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1. A.
   A: (iii); B: (i); C: (iv); D: (ii)
2. B.
   A: (iii); B: (iv); C: (i); D: (ii)
3. C.
   A: (iii); B: (iv); C: (ii); D: (i)
4. D.
   A: (iii); B: (i); C: (ii); D: (iv)

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of (A).
2. B.
   Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of (A).
2. B.
   Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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