Kala-azar is caused by
Trypanosoma cruzi
Leishmania donovani
Trypanosoma brucei
Trypanosoma gambiense
An example of gene therapy is
In the given flow diagram, the replication of retrovirus in a host is shown. Observe and answer the following questions.
$(a)$ Fill in $(A)$ and $(B)$
$(b)$ Why is the virus called retrovirus ?
$(c)$ Can the infected cell survive while viruses are being replicated and released ?
The disease called Vishuchika in Ayurveda is
$HIV$ that causes $AIDS$, first starts destroying
A chemical substance produced by a microorganism for inhibiting the growth of another is