16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

Lakhmir Singh & Manjit Kaur- Biology

Very Short Answer Type Questions-Pg-226

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Short Answer Type Questions-Pg-226

20 21 A 21 B 22 23 24 A 24 B 25 26 27 28 29 30 31 A 31 B 32 33 34 35 36 A 36 B 37 38 39 40

Long Answer Type Questions-Pg-227

41 A 41 B 42 A 42 B 43 A 43 B 44 A 44 B 45 A 45 B 45 C 45 D

Multiple Choice Questions (MCQs)-Pg-228

46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73

Questions Based on High Order Thinking Skills (HOTS)-Pg-230

74 75 76 77 78 79 80 A 80 B

Very Short Answer Type Questions-Pg-240

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Short Answer Type Questions-Pg-241

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

Long Answer Type Questions-Pg-241

34 A 34 B 35 A 35 B 35 C 36 A 36 B 37 A 37 B 38 A 38 B

Multiple Choice Questions (MCQs)-Pg-242

39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

Questions Based on High Order Thinking Skills (HOTS)-Pg-243

Q. 195.0( 5 Votes )

What are the caus

Class 10th Lakhmir Singh & Manjit Kaur- Biology 5. Our Environment

Answer :

chlorofluorocarbons and certain ozone depleting substances are responsible for depletion of ozone layer. If the ozone layer becomes thinner, ultraviolet radiations will penetrate through the layer and reach the surface of earth which when fall on humans will destroy the genetic material of skin cells thus causing their unlimited growth and thus resulting in skin cancer.

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