In which of the following is embryo formation $NOT$ observed?

In brown algae,the brown colour is due to the presence of:

Which plant group is considered 'thalloid' (lacking true roots, stems, and leaves)?

Assertion $(A)$: Algae are autotrophic in their mode of nutrition.
Reason $(R)$: Algae contain chlorophyll and other photosynthetic pigments.

Agar-agar is obtained from:

Which of the following statements are true regarding the figure given below?
$(i)$ It shows oogamy and post-fertilization development.
$(ii)$ Male gamete is small and motile.
$(iii)$ Stored food is floridean starch.
$(iv)$ Pectin,cellulose,and polysulphate esters are present in the cell wall.