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61. Explain the following terms :

(i) Benign tumour (ii) Malignant tumour (iii) Metastasis.

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62. What is sarcoma ?

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(i) Malignant tumours. are those which grow very rapidly , invade and damage the neighbouring cells and possess the feature of metastasis.

(ii) Carcinogenic. The factors which cause cancer are known as carcinogenic factors or carcinogens e.g. Chewing of tobacco, UV- radiations etc.

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64. What is contact inhibition

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65. Differentiate between normal cells and cancer cells.

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66. Briefly explain the followings :

Drugs, Drug addiction, Tranquillisers, Depressant and Stimulants.

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67. Explain the following : Psychedelic drugs and Barbiturates.

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68. What is Cannabis ? List its main derivatives.

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69. Draw structural formula of morphine and cannabinoid.

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70. Name some hallucinogens. What are their effects on human body ?

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