Which blood vessels have the smallest diameter?

Hydroponics is growing plant without____.

“Histology” is the study of: 

What makes a reptile a reptile?

The method of protecting iron from rusting, by coating a thin layer of Zinc is called:

Fungi are plants that lack:

Who was the first to have successfully read the Ashoka’s inscriptions? 

Mahavir Swami was born at: