Which plant group is considered 'thalloid' and lacks embryo formation (embryophyta)?

Which of the following types of algae is most likely to be found in the deepest waters?

Write a note on Phaeophyceae.

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

$Ulothrix$ produces

$A$: Pyrenoids may or may not be surrounded by a sheath of starch plates in algae.
$R$: In higher plants,these are replaced by amyloplasts.