The aquatic ancestry of bryophytes is best demonstrated by:

In bryophytes,fertilization occurs in .........

Bryophytes are called the amphibians of the plant kingdom because

In mosses,the second gametophytic stage is the leafy stage. Consider the following statements about the leafy stage:
$I.$ The leafy stage is produced from the secondary protonema as a lateral bud.
$II.$ They consist of upright,slender axes bearing spirally arranged leaves.
$III.$ They are attached to the soil through multicellular rhizoids.
$IV.$ This leafy stage bears the sex organs.
Which of the statements given above are correct?

Give the economic importance of bryophytic plants.

Rhizoids in $Riccia$ are