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Select the item which is made up of biod...

Select the item which is made up of biodegradable material - Plastic bag, Jute bag, nylon rope, kettle.

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Jute bag.
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Paper bags or jute bags can be used instead of plastic bag.

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

A bag contains 4 red and 4 black balls, another bag contains 2 red and 6 black balls. One of the two bags is selected at random and a ball is drawn from the bag which is found to be red. Find the probability that the ball is drawn from the first bag.

A beg contains 4 red and 4 black , another bag contains 2 red and 6 black balls. One of the two bags is selected at random and a ball is drawn from the bag which is found to be red. Find the probability that the ball is drawn from the first bag.

In a bag, there are 100 bulbs out of which 30 are bad ones. A bulb is taken out of the bag at random. The probability of the selected bulb to be good as:

There are two bags, one of which contains 3 black and 4 white balls, while the other contains 4 black and 3 white balls. A fair die is cast, if the face 1 or 3 turns up, a ball is taken from the first bag, and if any other face turns up a ball is chosen from the second bag. Find the probability of choosing a black ball.

Give below are the events that are observed in an artificial hybridization programme. Arrange them in the correct sequential order in which they are followed in the hybridisation programme. (a) Re-bagging (b) Selection of parents (c ) Bagging (d) Dusting the pollen on stigma (e) Emasculation (f) Collection of pollen from male parent.

A bag has contains 23 balls in which 7 are identical . Then number of ways of selecting 12 balls from bag.

Categorise the materials of the following products into' can be recycled' and cannot be recycled'.Telephone instruments,plastic toys, cooker handles , carry bags , ball point pens, plastic bowls, plastic covering on electrical wires, plastic chairs ,electric switches.

A bag has balls of which x are, 2x are white, and 3x are blue. A ball is selected at random. What is the probability that the balls drawn is (i) not blue (ii) white

OSWAAL PUBLICATION-OUR ENVIRONMENT-TOPIC - 2 (BIODEGRADABLE AND NON - BIODEGRADABLE SUBSTANCES AND GLOBAL WARMING)(VERY SHORT ANSWER TYPE QUESTIONS)
  1. Name the two important non-metallic oxides which causes acid rain :

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  2. What is Ozone ?

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  3. Why are some substance non-biodegradable ?

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  4. Ozone layer is getting depleted at higher levels of the atmosphere

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  5. . Name the chemical compound responsible for the depletion of ozone la...

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  6. Damage to the ozone layer is a cause of concern.

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  7. Name the gas which is produced due to incomplete combustion of fossil ...

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  8. What is the function of ozone in the upper atmosphere ?

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  9. Why should blodegradable and non-blodegradable wastes be discarded In ...

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  10. Which chemical is used In fire extinguishers? How is it harmful?

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  11. What happens during the first step of ozone formation in the atmospher...

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  12. How is ozone formed in the upper atmosphere? Why is the damage of ozon...

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  13. Select the item which is made up of biodegradable material - Plastic b...

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  14. Why is excessive use of CFCs a cause of concern?

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  15. The following organisms form a food chain. Which of these will have th...

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  16. . Name the chemical compound responsible for the depletion of ozone la...

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  17. Mention one negative effect of our affluent life style on the environm...

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  18. State a way to prevent accumulation of harmful chemicals in our bodies...

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  19. List two non-biodegradable wastes generated daily in kitchen which can...

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  20. Which disease is caused in human beings due to depletion of ozone laye...

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