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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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Normal cells	Cancerous cells
1.Show the property of contact inhibition.	1.Do not show the property of contact inhibition.
2. Controlled growth	2. Uncontrolled growth.
3. Do not show metastasis	3. May show mestasis
4. Mortal	4. Immortal

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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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