What is common among $Porphyra$,$Agaricus$,$Chlorella$,and $Spirulina$?

Which one of the following is not a member of Thallophyta?

What is the importance of Agar-Agar?

Select the correct option by matching the given groups $(i)$ red algae,$(ii)$ green algae,$(iii)$ bryophytes,and $(iv)$ Pteridophytes with their respective characteristics $(P, Q, R, S)$:
$(P)$ Their gametophyte is called prothallus.
$(Q)$ Rhizoids are present,but they are not true roots.
$(R)$ Pyrenoids contain protein besides starch.
$(S)$ Red pigment,$r$-phycoerythrin,is present in their body.
Match the groups $(i, ii, iii, iv)$ with the characteristics $(P, Q, R, S)$ and select the correct sequence.

Choose the correct option with respect to the features of different plant groups.
Group $\quad$ Embryo $\quad$ Gametes $\quad$ Asexual spore

Compared to the gametophyte of bryophytes,the gametophyte of vascular plants should be .......