Biology Questions and Answers
Gymnosperms
- What are the main divisions
and representing species of
the gymnosperms?
This group of plants can bconifers (pine, sequoia, cype divided intoress), that
have flowers k(cones), cycads (very nown as strobilesancient
gymnosperms, like the cycads used in
garden architecture, that also fstrobiles), gnetaceae (gnetum) ormand (^)
ginkgos (the known species is Ginkgo
biloba).
- How different are
gymnosperms from
bryophytes and
pteridophytes?
Gymnosperms are not cryptogamic as
bryophytes anare phanerogamic and so they formd pteridophytes are. They
flowers and seeds.
- What is the evolutionary
importance of the emergence
of seeds in the plant kingdom?
The evolutionary impis related to the plant capaortance obility off the seed
distant colonization anprotection of the embryo. d to theEmbryo-
containing seeds can be carried by
water, in different environments. This factwind and animals and germinate
contributes to the exploration of a
variety of ecological niches and for the
diversity of plant species.
Seeds in addition protect the plantembryo and they also pagainst extrovide germinatioernal aggressionsn under (^)
more adequate conditions (inside the
seed). These features contribevolutionary success of the ute to the
phanerogam.
- In which areas of the globe
is gymnosperm abundance
noteworthy?
These plants are the typical vegetation
of cold regions like forest, of the northern hemisphthe taiga, or borealere, or
the araucaria forests of the southern
hemisphere. - What is the life cycle of the
gymnosperms?
As all plalife cycle, i.e., nts they present a diplobionticalternation of generations (^)
with diploid and haploid stages. The
lasting (final) stage is the diploid one.
- What is pollen?
Pollen grains are the malegametophytes of the phanerogamic (^)
(floweripollen grains the male gng) plants. Therefore within ametes of thesethe (^)
plants are formed by mitosis.
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