Teacher asked Balan to write the principle of RNAi technology. Help him by describing the method.

What is Zone refining ? Describe the principle involved in the purification of the metal by this method.

Tarun observed a slide of white blood cells under microscope. His teacher asked him to draw the diagram. Select the diagram which should be drawn by Tarun.

In a biology period, the teacher drew the heart of rabbit on the board and explained its structure and functions. After the class, your friend told you that he finds it difficult to understand the concept and felt he wanted a detailed explanation. Do you think using technologies like Visual Communication help students to understand the difficult concepts in a simple way?

A king ordered his Goldsmith to make a crown which should be of pure gold. SO the goldsmith to made a crown of pure gold & brought it to king. but the king was not contended with the crown as he suspected whether it is made of pure gold or not. So he called for Archimedes and asked him to check whether it is a pure gold crowm. Archimedes was serious about this and went his home thinking how to solve this issue. He wanted to take bath, all of a sudden the jumped on to the bath tub. Water inside the tub had splashed out of it. An idea striked him suddenly he went running naked straight from his bathroom to the king's pace shouting Eureka Eureka on the road side. From this what do we infer ? State Archimedes principle.

A doctor detected a tumour in the body of a person. The patient feels that he would die soon due to tumour. How can you help him to overcome his fear?. Write your response.

Various methods are now available to help infertile couples. The methods are collectively called ART (Assisted Reproductive Technologies). a. What is IVF ? b. IVF is commonly called Test tube baby programme. Give reason. c. Name the first person who was born by this method.