1:   Eutrophication leads to death of fish due to
Options:
  1. Increased oxygen content
  2. Increased algal content
  3. Decreased algal content
  4. Decreased oxygen content

Answer: Option 4

Explanation:

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2:   Ozone hole refers to
Options:
  1. Hole in ozone layer
  2. Reduction in thickness of ozone layer in stratosphere
  3. Reduction in thickness of ozone layer in troposphere
  4. Increase in concentration of ozone

Answer: Option 2

Explanation:

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3:   Primary source of energy in an ecosystem is
Options:
  1. Sugar stored in plants
  2. Solar energy
  3. Fuel
  4. None of above

Answer: Option 2

Explanation:

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4:   World climate is threatened by increase in concentration of
Options:
  1. Oxygen
  2. Carbon dioxide
  3. Nitrogen
  4. Water vapours

Answer: Option 2

Explanation:

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5:   The main cause of soil erosion is
Options:
  1. Afforestation
  2. Less rains
  3. Thinning of ozone layer
  4. Deforestation

Answer: Option 4

Explanation:

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6:   Soil fertilty is reduced by
Options:
  1. Crop rotation
  2. Nitrogen fixing bacteria
  3. Decaying organic matter
  4. Intensive agriculture

Answer: Option 4

Explanation:

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7:   Ecology is the study of relationships between
Options:
  1. Water and environment
  2. Organism and environment
  3. Soil and water
  4. All of above

Answer: Option 2

Explanation:

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8:   Equillibrium state of ecosystem is called
Options:
  1. Cybernetics
  2. Homeostasis
  3. Niche
  4. Community

Answer: Option 2

Explanation:

(Homo-same + Statis-condition). Equilibrium state of ecosystem is called homeostasis Discuss this in Forums

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9:   Science of control of ecosystem is called
Options:
  1. Cybernetics
  2. Bioceonosis
  3. Biogeocoenosis
  4. Geobiocoenosis

Answer: Option 1

Explanation:

From the french word Kybernetes meaning pilot or governor. Discuss this in Forums

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10:   Which of the following terms was coined by A.G. Tansley in 1935
Options:
  1. Biogeocoenosis
  2. Geobiocoenosis
  3. Ecosystem
  4. Homeostasis

Answer: Option 3

Explanation:

The term Biogeocoenosis or geobiocoenosis is used for ecosystem, coined by Dokuchaev. Discuss this in Forums

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