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When and where does reduction division take place in the life cycle of a liverworts, a moss, a fern, a gymnosperm and an angiosperm?
(i) Liverworts Inside capsule part of sporangium. (ii) Moss Meiosis occurs in capsule part of sporangium. (iii) Fern It occurs inside sporangia often arranged in sori. (iv) Gymnosperm Inside microsporangium of microsporophyll and megasporangium or ovule. (v) Angiosperm Inside microsporangium of anthRead more
(i) Liverworts Inside capsule part of sporangium.
See less(ii) Moss Meiosis occurs in capsule part of sporangium.
(iii) Fern It occurs inside sporangia often arranged in
sori.
(iv) Gymnosperm Inside microsporangium of
microsporophyll and megasporangium or ovule.
(v) Angiosperm Inside microsporangium of anther and
megasporangium or ovule.
How is triploid PEN (Primary Endosperm Nucleus) is formed? What is indicated by triploid condition of endosperm?
The zygote is produced by the process of syngamy and the other male gamete fuses with the secondary nucleus to form the triploid Primary Endosperm Nucleus (PEN). In angiosperms, the astrological nature of the endosperm is triploid (3n). In the triploid condition, each nucleus has three sets of chromRead more
The zygote is produced by the process of syngamy and
See lessthe other male gamete fuses with the secondary nucleus
to form the triploid Primary Endosperm Nucleus (PEN).
In angiosperms, the astrological nature of the endosperm
is triploid (3n). In the triploid condition, each nucleus has
three sets of chromosomes.
How do angiosperms support pollinators to carry out pollination in contrast to gymnosperms?
In gymnosperms, pollination is carried out only by wind. Flowers in angiosperms have showy petals, nectaries, scent glands and several other devices to attract the insects, birds and other animals including man to help them to get pollinated.
In gymnosperms, pollination is carried out only by wind.
See lessFlowers in angiosperms have showy petals, nectaries,
scent glands and several other devices to attract the
insects, birds and other animals including man to help
them to get pollinated.
You are given microsporophyll of a gymnosperm and an angiosperm without any labelling. How will you differentiate both?
Microsporophyll of gymnosperms It is broad and not distinguished into filament and anther, Microsporophyll of angiosperms It consists of a filament and a terminal anther.
Microsporophyll of gymnosperms It is broad and not
See lessdistinguished into filament and anther,
Microsporophyll of angiosperms It consists of a
filament and a terminal anther.
Differentiate between haplontic and diplontic life cycles.
The gametes fuse and give rise to diploid zygote. Meiosis in the zygote results in the formation of haploid spores. This is haplontic life cycle. In diplontic life cycle. diploid sporophyte is dominant. Zygote develops into an embryo and then into a sporophyte.
The gametes fuse and give rise to diploid zygote. Meiosis
See lessin the zygote results in the formation of haploid spores.
This is haplontic life cycle.
In diplontic life cycle. diploid sporophyte is dominant.
Zygote develops into an embryo and then into a
sporophyte.
Demonstrate alternation of generations in plants through a diagram.
Alternation of generations in plants
Alternation of generations in plants
See lessBoth gymnosperms and angiosperms bear seeds. But, why are they classified separately?
Gymnosperms and angiosperms are classified separately although they both bear seeds because of following reason (i) Ovules in gymnosperms are naked. In angiosperms, they are enclosed inside the ovary. (ii) Wood is non-porous in gymnosperm, i.e., the vessels are absent. Wood in angiosperms is porous,Read more
Gymnosperms and angiosperms are classified separately
See lessalthough they both bear seeds because of following
reason
(i) Ovules in gymnosperms are naked. In angiosperms,
they are enclosed inside the ovary.
(ii) Wood is non-porous in gymnosperm, i.e., the vessels
are absent. Wood in angiosperms is porous, i.e., the
vessels are present.
On which basis angiosperms are classified?
Angiosperms are divided into two subgroups,. i.e., dicotyledons and monocotyledons. This grouping is based on number of embryonic leaves or cotyledons. The two are commonly called as monocots and dicots.
Angiosperms are divided into two subgroups,. i.e.,
See lessdicotyledons and monocotyledons. This grouping is
based on number of embryonic leaves or cotyledons. The
two are commonly called as monocots and dicots.
How does Cycas resemble bryophytes and pteridophytes?
Cycas resembles bryophytes and pteridophyte in following ways (i) In its female gametophyte, archegonia are differentiated which contain the female gametes. (ii) It has ciliated antherozoids.
Cycas resembles bryophytes and pteridophyte in
See lessfollowing ways
(i) In its female gametophyte, archegonia are
differentiated which contain the female gametes.
(ii) It has ciliated antherozoids.
Which gymnosperm provide these items?
(i) Taxol Taxus (ii) Canada balsam Abies balsamea (iii) Tannins Tsuga canadensis (iv) Copal Agathis australis.
(i) Taxol Taxus
See less(ii) Canada balsam Abies balsamea
(iii) Tannins Tsuga canadensis
(iv) Copal Agathis australis.