Read the following and answer any four questions. 

Human activity had a negative impact on all types of biosphere-wide living things. The delicate ecological balance between the living and non-living components of the biosphere was upset by man's unrestricted use of nature. The unfavourable conditions that man had produced risked not only his own life but also the survival of all other living things on mother earth. One of your classmates is an active participant in the school's "Eco club," which works to raise environmental awareness among students, spread it throughout society, and actively prevent environmental degradation of the surroundings. 

 

a) Why is it necessary to conserve our environment? 

(i) To save water, air and soil from pollution. 

(ii) To maintain ecological balance. 

(iii) To save the ozone layer 

(iv) All of these 

 

b) What does the dustbins' colours, green and blue, stand for? 

(i) Biodegradable waste and non-biodegradable waste, respectively.  

(ii) Non-biodegradable waste and biodegradable waste, respectively.  

(iii) Eco-friendly waste 

(iv) Domestic waste only 

 

c) Why is it so hard to recycle plastics? 

(i) Because it is a very hard material 

(ii) Because of the different sizes of plastic 

(iii) Because it is very adhesive in its nature 

(iv) Because of different types of polymer resins 

 

d) Which group(s) of the following categories of materials only includes non-biodegradable items? 

       I) Wood, paper, leather                                         II) Polythene, detergent, PVC        

       III) Plastic, detergent, grass                                  IV) Plastic, bakelite, DDT  

(i) (III) 

(ii) (IV) 

(iii) (I) and (III) 

(iv) (II) and (IV)  

 

e) Which of these wastes that are produced daily in the kitchen that are not biodegradable may be recycled?  

(i) Polythene bags  

(ii) Plastic containers  

(iii) Vegetable waste  

(iv) Both (i) and (ii)