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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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63. Define the following :

(1) Malignant tumours (ii) Carcinogenic.

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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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