1. A
   Carbon Dioxide
2. B
   Methane
3. C
   ChloroFloroCarbons
4. D
   Nitrogen

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1. A
   Composting
2. B
   Recycling
3. C
   Landfilling
4. D
   Incineration

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

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1. A
   Trophic steps
2. B
   Food levels
3. C
   Trophic levels
4. D
   Food steps

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1. A
   relationship between animals and environment.
2. B
   relationship between plants and animals
3. C
   various interlinked food chains in an ecosystem
4. D
   relationship between the organisms and the environment

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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
   Two to three
2. B
   Three to four
3. C
   Four to five
4. D
   Unlimited

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

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1. A
   Carbondioxide
2. B
   Chlorofluorocarbons
3. C
   Methane
4. D
   Sulphur dioxide

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1. A
   Grassland
2. B
   River
3. C
   Desert
4. D
   Garden

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1. A
   Bidirectional
2. B
   No specific direction
3. C
   Unidirectional
4. D
   Multidirectional

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1. A
   self pollination
2. B
   double fertilisation
3. C
   no fertilisation
4. D
   cross fertilization

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1. A
   Livinglogy
2. B
   Genetics
3. C
   Evolution
4. D
   Taxonomy

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1. A
   9
2. B
   18
3. C
   8
4. D
   20

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1. A
   Tt and Tt
2. B
   TT and TT
3. C
   TT and tt
4. D
   Tt and tt

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1. A
   Wrinkled and yellow
2. B
   Round and yellow
3. C
   Round and green
4. D
   Wrinkled and green

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

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

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1. A
   Physiological isolation
2. B
   Behavioural isolation
3. C
   Temporal isolation
4. D
   Mechanical isolation

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1. A
   Sex chromosomes
2. B
   body cell chromosomes
3. C
   Somatic chromosomes
4. D
   Autosomes

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1. A
   Back cross
2. B
   Test cross
3. C
   Monohybrid cross
4. D
   Reciprocal cross

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

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1. A
   Five
2. B
   Six
3. C
   Twelve
4. D
   Seven

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1. A
   Tt and tt
2. B
   Tt and Tt
3. C
   TT and tt
4. D
   TT and Tt

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

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