NCERT Solutions

Read and Find Out

1. How did a book become a turning point in Richard Ebright’s life?

Answer: The book ‘The Travels of Monarch X’ opened the world of science for Richard. After reading it he became interested in tracking the migration of butterflies. This interest led him to other projects and inspiration. Finally he became a great scientist.

2. How did his mother help him? or Which book did Ebright’s mother get for him? How did it change his life?

Answer: Richard’s mother proved to be a great help to him. She took him on trips and bought scientific equipment for him. She spent all her time in setting up challenges for him. This helped him to learn a lot. She presented him the book ‘The Travels of Monarch X’. The book changed Richard’s life forever.

3. What lesson does Ebright learn when he does not win anything at a science fair?

Answer: Ebright exhibited slides of frog tissues at a science fair. He did not get any prize. He learnt an important lesson that science is not just about display. It is about projects and experiments. He began conducting experiments from that day onwards.

4. What experiments and projects does he do then undertake?

Answer: He undertook many projects and experiments. He worked on viceroy butterflies to show that they copy monarch butterflies. He studied bright spots on the monarch pupa and discovered a new hormone. Also, he found out how cells read their DNA.

5. What are the qualities that go into the making of a scientist?

Answer: There are three essential qualities that make a scientist. The first is a first-rate mind. The next is the presence of curiosity. Last but not the least, it is the will to do the best and win.

Think About It

1. You must have read about cells and DNA in your science books. Discuss Richard Ebright’s work in the light of what you have studied. If you get an opportunity to work like Richard Ebright on projects and experiments which field would you like to work on and why?

Answer:  DNA carry the blueprint of life and heredity. They pass information from one generation to the other.

If I get an opportunity to work like Richard Ebright, I would choose to study about diseases. By studying the DNA, I may find ways and means to cure many diseases.

Talk About It 

1. Children everywhere wonder about the world around them. The questions they ask are the beginning of scientific enquiry. Given below are some questions that children in India have asked Prof Yashpal and Dr Rahul Pal as reported in their book, Discovered Questions.

(i) What is DNA fingerprinting? What are its uses?

(ii) How do honey bees identify their own honeycombs?

(iii) Why does rain fall in drops?

 Answer:(i)  DNA fingerprinting is a forensic technique used to identify individuals by the characteristics of the DNA. It is used in parentage testing. It is also used in criminal investigation to identify a person or to place him at the scene of crime.

(ii) Honey bees have signalling chemicals. They leave trails for fellow honeybees so that they can reach their honeycomb.

(iii) The only solid thing in the air are dust particles. Water vapour uses it as a centre of attraction when it becomes too heavy. Water vapour condenses on the dust particle as a drop and falls on Earth.