What are tracheids?

What is a tissue? What are its kinds?

Give the technical terms used for the following: It is the first formed xylem element in the primary xylem, which has small tracheids and vessels.

What are histones? What are their functions?

What is cancer? What are its causes ? What are methods ot detect cancers?

What are Enzymes ? What are their characteristics (properties)?

What are radio-isotopes? What are their applications?

What is modulation? What are its types?