1. A
   The population of tigers will increase
2. B
   The tigers will die
3. C
   The tigers will start eating grass
4. D
   The amount of grass will decrease

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1. A
   10%
2. B
   8%
3. C
   5%
4. D
   1%

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

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

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1. A
   Vulture, rat and rabbit
2. B
   Rat, tree, lion, snake
3. C
   Rat, rabbit, grasshopper
4. D
   Lion, rat, Rabit, grass

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

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1. A
   Rat and rabbit
2. B
   Vulture and lion
3. C
   Tree and grass
4. D
   Snake, lion

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1. A
   1 - B, 2 - D, 3 - A, 4 - C
2. B
   1 - C, 2 - B, 3 - D, 4 - A
3. C
   1 - A, 2 - D, 3 - C, 4 - B
4. D
   1 - A, 2 - C, 3 - B, 4 - D

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1. A
   1 - B, 2 - D, 3 - A, 4 - C
2. B
   1 - C, 2 - B, 3 - D, 4 - A
3. C
   1 - D, 2 - A, 3 - C, 4 - B
4. D
   1 - A, 2 - C, 3 - B, 4 - D

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1. A
   1 - B, 2 - D, 3 - A, 4 - C
2. B
   1 - C, 2 - B, 3 - D, 4 - A
3. C
   1 - C, 2 - B, 3 - D, 4 - A
4. D
   1 - A, 2 - C, 3 - B, 4 - D

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1. A
   1 - D, 2 - A, 3 - C, 4 - B
2. B
   1 - C, 2 - B, 3 - D, 4 - A
3. C
   1 - A, 2 - C, 3 - B, 4 - D
4. D
   1 - B, 2 - D, 3 - A, 4 - C

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

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1. A
   1 - C, 2 - B, 3 - D, 4 - A
2. B
   1 - D, 2 - A, 3 - C, 4 - B
3. C
   1 - A, 2 - C, 3 - B, 4 - D
4. D
   1 - B, 2 - D, 3 - A, 4 - C

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1. A
   1 - D, 2 - A, 3 - C, 4 - B
2. B
   1 - B, 2 - D, 3 - A, 4 - C
3. C
   1 - A, 2 - C, 3 - B, 4 - D
4. D
   1 - C, 2 - B, 3 - D, 4 - A

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1. A
   1 - C, 2 - B, 3 - D, 4 - A
2. B
   1 - D, 2 - A, 3 - C, 4 - B
3. C
   1 - A, 2 - C, 3 - B, 4 - D
4. D
   1 - B, 2 - D, 3 - A, 4 - C

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1. A
   1 - C, 2 - B, 3 - D, 4 - A
2. B
   1 - D, 2 - A, 3 - C, 4 - B
3. C
   1 - A, 2 - C, 3 - B, 4 - D
4. D
   1 - B, 2 - D, 3 - A, 4 - C

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1. A
   1 - A, 2 - C, 3 - B, 4 - D
2. B
   1 - C, 2 - B, 3 - D, 4 - A
3. C
   1 - D, 2 - A, 3 - C, 4 - B
4. D
   1 - B, 2 - D, 3 - A, 4 - C

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

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1. A
   100%
2. B
   10%
3. C
   20%
4. D
   1%

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1. A
   Ozone is deadly poisonous.
2. B
   Ozone gets decomposed by UV radiations.
3. C
   Ozone is a molecule formed by three atoms of oxygen.
4. D
   Ozone shields the surface of the Earth from ultraviolet radiations.

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1. A
   All green plants and blue-green algae are producers
2. B
   Plants convert solar energy into chemical energy
3. C
   Green plants get their food from organic compounds
4. D
   Producers prepare their own food from inorganic compounds

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1. A
   B
2. B
   D
3. C
   C
4. D
   A

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

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1. A
   Ozone shields the surface of the Earth from ultraviolet radiations.
2. B
   Ozone is a molecule formed by three atoms of oxygen.
3. C
   Ozone is deadly poisonous.
4. D
   Ozone gets decomposed by UV radiations.

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1. A
   Conjunctivitis
2. B
   Cataract
3. C
   Short-sightedness
4. D
   Colour blindness

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