Q14 of 30 Page 1

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

1. Increased crop yield with less dependence on chemical pesticides.

2. Reduced post-harvest loss.


3. Made crops that are tolerant to stress like draught, heat, cold, etc. (abiotic stresses).


4. Improved nutritional value due to the efficient mineral uptake by the plants.


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

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

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Name the technique used in separating the DNA fragments to be used in biotechnology experiments. Write how does the separation of DNA fragments occur.

 16

Write the possible genotypes of the following:

(a) The F1 progeny of a cross between a heterozygous tall pea plant and a dwarf pea plant.


(b) The woman whose son has blood group ‘O’ and her husband has blood group ‘A’.