1
Question
Differentiate between the gametophyte of bryophytes and that of pteridophytes
Open in App
Solution
Bryophytes are embryophytes that are non-vascular i.e., they have no xylem and phloem.
Pteridophyte are vascular plants i.e., plants with xylem and phloem, that reproduce and disperse via spores.
The dominant phase in bryophyte is gametophyte while the dominant phase in pteridophyte is sporophyte.
Bryophytes have no true roots while pteridophyte have true roots.
Bryophytes have no vascular tissues while pteridophytes have vascular tissues.
in bryophytes (mosses, liverworts, and hornworts), the gametophyte is the most visible stage of the life cycle.
The bryophyte gametophyte is longer lived, nutritionally independent, and the sporophytes are typically attached to the gametophytes and dependent on them.
When a moss spore germinates it grows to produce a filament of cells (called the protonema). The mature gametophyte of mosses develops into leafy shoots that produce sex organs (gametangia) that produce gametes. Eggs develop in archegonia and sperm in antheridia.
In some bryophyte groups such as many liverworts of the order Marchantiales, the gametes are produced on specialized structures called gametophores (or gametangiophores).
All vascular plants (pteridophytes) are sporophyte dominant, and a trend toward smaller and more sporophyte-dependent female gametophytes is evident as land plants evolved towards reproduction by seeds.
Vascular plants such as ferns that produce only one type of spore are said to be homosporous. They have exosporic gametophytes—that is, the gametophyte is free-living and develops outside of the spore wall. Exosporic gametophytes can either be bisexual, capable of producing both sperm and eggs in the same thallus (monoicous), or specialized into separate male and female organisms (dioicous).
In heterosporous vascular plants (plants that produce both microspores and megaspores), the gametophyte develops endosporically, within the spore wall. These gametophytes are dioicous, producing either sperm or eggs but not both.
Pteridophyte are vascular plants i.e., plants with xylem and phloem, that reproduce and disperse via spores.
The dominant phase in bryophyte is gametophyte while the dominant phase in pteridophyte is sporophyte.
Bryophytes have no true roots while pteridophyte have true roots.
Bryophytes have no vascular tissues while pteridophytes have vascular tissues.
in bryophytes (mosses, liverworts, and hornworts), the gametophyte is the most visible stage of the life cycle.
The bryophyte gametophyte is longer lived, nutritionally independent, and the sporophytes are typically attached to the gametophytes and dependent on them.
When a moss spore germinates it grows to produce a filament of cells (called the protonema). The mature gametophyte of mosses develops into leafy shoots that produce sex organs (gametangia) that produce gametes. Eggs develop in archegonia and sperm in antheridia.
In some bryophyte groups such as many liverworts of the order Marchantiales, the gametes are produced on specialized structures called gametophores (or gametangiophores).
All vascular plants (pteridophytes) are sporophyte dominant, and a trend toward smaller and more sporophyte-dependent female gametophytes is evident as land plants evolved towards reproduction by seeds.
Vascular plants such as ferns that produce only one type of spore are said to be homosporous. They have exosporic gametophytes—that is, the gametophyte is free-living and develops outside of the spore wall. Exosporic gametophytes can either be bisexual, capable of producing both sperm and eggs in the same thallus (monoicous), or specialized into separate male and female organisms (dioicous).
In heterosporous vascular plants (plants that produce both microspores and megaspores), the gametophyte develops endosporically, within the spore wall. These gametophytes are dioicous, producing either sperm or eggs but not both.
Suggest Corrections
2
Similar questions
View More
Join BYJU'S Learning Program
Explore more
Join BYJU'S Learning Program
