Which of the following is group of only biodegradable substances ?
( A) Plastic Leather wood
(B) Grass Plastic , Banana Peel
( C) Wood Grass Banana Peel
(D)Leather Glass Banana Peel .

Which of the following is not an example of bio-mass energy source ? (a) wood (b) gobar gas ( c) atomic energy (d) coal.

Which of the following plants groups shows internal fertillsation only ? (a) algae , (b) Bryophytes (c ) Pteridophytes , (d) Fungi

Which of the following does NOT belong to this group? A. Banana B. Litchi C. Lettuce D. Kiwi

Which of the following is the best container for gas during isothermal process? (A) Glass vessel (B) Wood vessel (C) Copper vessel (D) Thermos flask

Unlimited exploitation of nature by man disturbed the delicate ecological balance between the living and non-living components of the biosphere. The unfavourable conditions created by man himself threatened the survival not only of him but also of the entire living organisms on the mother earth. Rehan is an active member of 'Eco club' of his school which is creating environmental awareness amongst the school students, spreading the same in the society and also working hard for preventing environmental degradation of the surroundings. As part of this awareness programme, they are explaining the importance of using different dustbing for biodegradable and non-biodegradable wastes. Generally green duslbing are for biodegradable wastes and blue for non-biodegradable wastes. In the following groups of materials, which group(s) contains only non-biodegradable items? (I) Wood, paper, leather (II) Polythene, detergent, PVC (III) Plastic, detergent, grass (IV) Plastic, bakelite, DDT

The activities of man had adverse effects on all forms of living organisms in the biosphere. Unlimited exploitation of nature by man disturbed the delicate ecological balance between the living and non-living components of the biosphere. The unfavourable conditions created by man himself threatened the survival not only of him but also of the entire living organisms on the mother earth. One of your classmates is an active member of 'Eco club' of your school which is creating environmental awareness amongst the school students, spreading the same in the society and also working hard for preventing environmental degradation of the surroundings. Which of these group(s) contains only non biodegradable items? (i) Wood, paper, leather (ii) Polythene, detergent, PVC (iii) Plastic, detergent, grass (iv) Plastic, bakelite, DDT