Biology Questions and Answers
constituted an important source of food
for terrestrialconductive vessels they co animals. By presentinguld be larger, (^)
a feature inherited from them by
phanerogamic plants.
- What are the main parts of
ferns?
Ferns are come downwarconstituted bds from the rhizomy small roots thate
(stem, often horizontalized). The fronds
also arise back side of each leafrom the rhizome. On thef of the plant there (^)
are small dustlike dots called sori
(singular, “sorus”,“seeds”). also known as
- What is the type of life
cycle present in
pteridophytes?
Like all plants pteridophytes pdiplobiontic (alternation of generations,resent (^)
or metagenesis) life cycle.
- Why are pteridophytes
more common in humid
places?
Pteridophytes are more common in
humid places bwater for their gametes to fecundateecause they depend on
one another. In humid environments
their reproduction they proliferate. is more intense and
- What is the structure of the
adult fern within which cells
undergoing meiosis can be
found?
In these plants mwithin structures called soreiosis takes placus (plural,e (^)
sori), small dthe underside of fern leaves. Tustlike brown dots lininghe sori (^)
contain sporangia where reproductive
cells undergo meiosis and where sporesare produced.
- What is the prothallus of
pteridophytes?
Prothallus is thgametophyte (te pteridophytehe haploid individual (^)
that forms gamdevelops by mitosisetes). T from a she gametopore.phyte
- How are gametes formed
in the pteridophyte life cycle,
by mitosis or meiosis? What is
the type of meiosis that occurs
in pteridophytes?
In pteridophytes gametes are made by
mitosisgametophyte. As in from special cells of theall plants, in (^)
pteridophytes, meiosis is sporic, i.e.,
cells of the sporophyte unand generate spores that then bydergo meiosis
mitosis develop into the gametophyte.
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