Q6 of 37 Page 111

The pH range most conducive for life of fresh water plants and animals is

For the life of fresh water plants and animals, the pH value should be neutral i.e. at 7. Since in above options, the value of neutral pH lies in range 6.5-7.5. Therefore, this pH range is closest to the neutral value. So, option ‘a’ is correct answer.

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The main cause for abundant coliform bacteria in the river Ganga is

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The pH of water sample collected from a river was found to be acidic in the range of 3.5 – 4.5. On the banks of the river were several factories that were discharging effluents into the river. The effluents of which one of the following factories is the most likely cause for lowering the pH of river water?

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The three R’s that will help us to conserve natural resources for long term use are

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Given below are a few statements related to biodiversity. Pick those that correctly describe the concept of biodiversity

(i) Biodiversity refers to the different species of flora and fauna present in an area


(ii) Biodiversity refers to only the flora of a given area


(iii) Biodiversity is greater in a forest


(iv) Biodiversity refers to the total number of individuals of a particular species living in an area