Both gymnosperms and angiosperms bear seeds,then why are they classified separately?

Write a note on the economic importance of algae and gymnosperms.

Read carefully the following statements:
$I.$ Funaria possesses unicellular and unbranched rhizoids.
$II.$ Gemmae are asexual buds, which originate from small receptacles called gemma cups.
$III.$ The Sphagnum plants have a magnificent property of retaining water.
$IV.$ Mosses along with lichens are the first organisms to colonise rocks.
Which of the statements given above are correct?

Assertion $(A)$: In $Volvox$,the zygote undergoes meiosis to form four haploid cells before germination.
Reason $(R)$: $Volvox$ exhibits a haplontic life cycle.

Into which groups are the non-flowering plants (Cryptogams) divided?

The kingdom characterized by the presence of a rigid cell wall and the formation of an embryo is ......... .