Please can someone help me with these questions..

1)How to answer a question?
For Example:
Genetic Engineering and Biotechnology are considered to be the sciences of 21st century. What is the current status of their role in agricultural research in Pakistan and what could be their possible contribution in future in this context? Comment.

Now if this is the question.Should I write everything positive or should I intricate the negative effects of biotechnology too.Also how exactly to answer.Please someone guide me.Should it be more technical or general.

2)I am done with my first 2 chapters of the book by akhtar abbass..There were so many facts and figures while answering a question should I highlight them.:S..

3)Also as agriculture is a kind of new to me (apart from me being an environment student) ...please can you suggest that preparing a chapter is wise or focusing on past paper questions.??

I will highly appreciate your help.I am stuck in the middle