Write the two specific ‘cry’ genes that encode the proteins which control cotton bollworms.

(a) Mention the importance of gel-electrophoresis in biotechnology.

(b) Explain the process of this technique.

(a) Why and how must the ozone layer in the stratosphere be protected? Explain.

(b) How do deforestation and green house gases negatively affect our environment? Explain.

OR

Biomagnification and accelerated eutrophication are both caused due to indiscriminate use of chemicals and irresponsible human activities. Do you agree? Support your answer with explanation and an example of each.

Write the genotypes of the parents of a child suffering from thalassemia. State the cause of this disease.

List any four common approaches for treatment of cancer.