Which of the following are the decomposers of plants?

Read the following four statements $(A-D)$ carefully :
$(A)$ Heterocyst is found in $Nostoc$
$(B)$ All bacteria are heterotrophs
$(C)$ Both $Funaria$ and $Marchantia$ are monoecious.
$(D)$ The walls of diatoms are easily destructible.
How many of the above statements are correct?

Identify the mismatched pair from the following.

Which of the following is not a prokaryote?

Match the following columns:

Column-$I$	Column-$II$
$1$. Conidia	$p$. Flask-shaped fruiting body
$2$. Perithecium	$q$. Sex organ
$3$. Crustose	$r$. Asexual reproduction
$4$. Fruiting body	$s$. External form of lichen

In the three-domain system of classification,how are prokaryotic and eukaryotic organisms divided into domains?