Q10 of 49 Page 1

List four benefits to human life by eliminating the use of CFCs.

a. Elimination of the use of CFCs can prevent damaging and ageing of skin.


b. Prevention of ozone layer depletion and prevention of global warming.


c. Reduction in greenhouse effect.


d. Reduction in odd climatic changes or El Nino effect.


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8

Mention one application for each of the following :

A. Passive immunization


B. Antihistamine


C. Colostrum


D. Cytokinin-barrier

 9

Name the microbes that help production of the following products commercially.

A. Stain


B. Citric acid


C. Penicillin


D. Butyric acid

 10

Suggest two practices giving one example of each that help protect rare or threatened species.

 11

A. Can a plant flowering in Mumbai be pollinated by pollen grains of the same species growing in New Delhi? Provide explanations to your answer.

B. Draw the diagram of a pistil where pollination has successfully occurred. Label the parts involved in reaching the male gametes to its desired destination.