Agar,which is required for the synthesis of ice cream and jelly,is obtained from:

Which group of plants lacks differentiated organs such as roots,stems,and leaves?

Most important alga in research centres is

Some characters of algae are given below:
$a.$ Floridean starch
$b.$ Sulphated phycocolloids in cell wall
$c.$ Alginic acid
$d.$ Trumpet hypha
$e.$ Haplodiplontic life cycle
$f.$ Isomorphic alternation of generation
$g.$ Fucoxanthin
$h.$ Phycoerythrin
$i.$ Zygotic meiosis
$j.$ Two anterior flagella
Which of the given set of characters belongs to $Laminaria$?

Match the following columns:

Column-$I$	Column-$II$
$P$. Chlorophyceae	$I$. $2$, unequal lateral flagella
$Q$. Phaeophyceae	$II$. Flagella absent
$R$. Rhodophyceae	$III$. $2-8$, equal apical flagella

Zygotic meiosis is characteristic of $:$