Identify the plant part shown in the figure.

In which way has the study of biology helped us to control infectious diseases?

Match the following columns correctly:

Column-$I$ (Disease)	Column-$II$ (Pathogen)	Column-$III$ (Symptom)
$a$. Common Cold	$i$. Streptococcus pneumoniae	$p$. Swelling in lower limbs
$b$. Pneumonia	$ii$. Rhinovirus	$q$. Skin lesions
$c$. $AIDS$	$iii$. Retrovirus	$r$. Nasal congestion and discharge
$d$. Filariasis	$iv$. Filarial worm	$s$. Lips and fingernails turn gray to bluish

Pests resistant to insecticides have:

Match the columns:

Column-$I$	Column-$II$	Column-$III$
$(a)$ Common cold	$(1)$ Streptococcus pneumoniae	$(P)$ Inflammation of hands and legs
$(b)$ Pneumonia	$(2)$ Rhinovirus	$(Q)$ Cancer of skin and vessels
$(c)$ $AIDS$	$(3)$ Retrovirus	$(R)$ Disease of nasal congestion
$(d)$ Elephantiasis	$(4)$ Filarial worms	$(S)$ Finger nails turn blue to gray in color

How many of the following diseases can be classified as autoimmune diseases?
Rheumatoid arthritis,Myasthenia gravis,$AIDS$,$SCID$,Vitiligo,Hashimoto's disease,Multiple sclerosis,Cancer,Type-$I$ diabetes.