Which diseases spread from one person to another?

What was the major contribution of Louis Pasteur to the field of biology?

Assertion $(A)$: Aflatoxins are produced by $Aspergillus$ $flavus$.
Reason $(R)$: These toxins are useful to mankind.

Distinguish between: Infectious diseases and Non-infectious diseases.

The biological agents of disease include

Select the correct option to fill up the blanks.
$(i)$ Diseases which are easily transmitted from one person to another,are called $.....$ diseases.
$(ii)$ In human body,parasite of malaria initially multiplies within the $........$ and then attack the $......$
$(iii) ......$ is the yellowish fluid secreted by mother during the initial days of lactation.
$(iv) ......$ and $.......$ are the primary lymphoid organs.