Q12 of 30 Page 1

List four common warning signs of ‘drug and alcohol abuse’ among youth.

1. Drop in academic performance, i.e., scoring less in exams and not paying attention in class.

2. Regularly missing college or school without any valid reason.


3. Change in behaviour. Showing reckless and careless behaviour and also causing violence.


4. Change in eating and sleeping habits. Like sleeping too much or finding difficulties in sleeping (insomnia).


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10

(a) Which of the following animals undergo external fertilisation?

(i) Amphibians


(ii) Reptiles


(iii) Birds


(iv) Fish


(b) Mention one disadvantage of external fertilisation?


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Differentiate between active and passive immunisation giving one example of each.

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Explain the importance of growing microbes like Spirulina on a large scale.

 14

List any four ways in which genetic modification of plants has proved to be useful in crop production.