Which of the following is an example of an animal virus?

Identify the virus shown in the given figure.

Lichens are indicators of $SO_2$ pollution because they are ........

The protein coat of a virus is called

There exists a close association between the algae and the fungus within a lichen. The fungus

Read the following statements carefully and identify correct statements $w.r.t.$ Lichens:
$a.$ The association cannot tolerate air pollution,especially due to sulphur dioxide.
$b.$ Lichens are annuals and their growth is slow.
$c.$ The fungal partner mostly belongs to Ascomycetes.
$d.$ Soredia are most efficient means of asexual reproduction.
$e.$ Orchids seldom occur without this association.
$f.$ Foliose lichens are pioneers of succession in a water body.