Answer the question number 11 or
Write the scientific names with thier utility of the following plants .
(a) Chinchona 
(b) Neem
(c) Rauwelfia

Dear Student,

The correct spelling is cinchona and Rauvolfia.
a) Cinchona
The scientific name is Cinchona officinalis
The bark of a Chinchona tree is used as a cure for malaria. The medicine known as Quinine is made from this tree.  

b) Neem
The scientific name is Azadirachta indica
Neem products can be used for pain relieving, anti-inflammatory and fever caused by malaria. Neem also aids in the healing of cuts, burns, earaches, sprains and headaches. Neem has anti-bacterial properties, therefore, it is also used to treat skin diseases such as chickenpox, warts, etc.

c) Rauwolfia
The scientific name is Rauvolfia
Rauvolfia serpentina contains a number of bioactive chemicals that are used in the treatment of diseases such as hypertension and Schizophrenia. It is also used as an antidote against bites of reptiles especially snakes. Rauvolfia vomitoria contain an alkaloid, reserpine which is used to treat high blood pressure.

Regards