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

Reducing the usage of natural resources to a limited amount without wasting it helps in saving our natural Resources for long time. Since Plastic, paper, glass can be used again and again by recycling them and thus helps in conserving natural resources for long term. Reusing the used things again and again also helps in conserving the natural resources. So, the three R’s are Reduce, Recycle and Reuse.

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5

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?

 6

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

 8

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

 9

Among the statements given below select the ones that correctly describe the concept of sustainable development

i. Planned growth with minimum damage to the environment


ii. Growth irrespective of the extent of damage caused to the environment


iii. Stopping all developmental work to conserve the environment


iv. Growth that is acceptable to all the stakeholders