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To which class of Bryophyta Anthoceros belong? Why is it called a hornwort?
Bryophyta belongs to the class-Anthocerotopsida The sporophyte of Anthoceros is partially dependent on the gametophyte which is cylindrical like a horn hence, the Anthoceros is called as hornwort.
Bryophyta belongs to the class-Anthocerotopsida
See lessThe sporophyte of Anthoceros is partially dependent on
the gametophyte which is cylindrical like a horn hence,
the Anthoceros is called as hornwort.
On the basis of which three features, Selaginella shows traits of seed habit?
Selaginella shows seed habits because of (i) heterospory (ii) formation of two types of gametophytes, male and female. (iii) only one megaspore mother cell is functional.
Selaginella shows seed habits because of
See less(i) heterospory
(ii) formation of two types of gametophytes, male and
female.
(iii) only one megaspore mother cell is functional.
Natural system of classification is considered better than artificial system of classification. Explain.
The following reasons explain this (i) Only related organisms occur in a group, in natural system of classification as it prevents grouping of unrelated organisms. (ii) it shows natural relationship among organisms.
The following reasons explain this
See less(i) Only related organisms occur in a group, in natural
system of classification as it prevents grouping of
unrelated organisms.
(ii) it shows natural relationship among organisms.
On which criteria chemotaxonomy is based? Can it be used for classification?
Chemotaxonomy or biochemical taxonomy is based on the protein and serum analysis and on the chemical constituents of the organisms, This type of taxonomy is particularly utilised in the classification of plants, as chemical constituents of plant species are stable and do not change easily.
Chemotaxonomy or biochemical taxonomy is based on
See lessthe protein and serum analysis and on the chemical
constituents of the organisms, This type of taxonomy is
particularly utilised in the classification of plants, as
chemical constituents of plant species are stable and do
not change easily.
What was the drawback of artificial system of classification?
The artificial system of classification was mainly based on vegetative characters or on the androecium structure (system given by Linnaeus). Such system separated the closely related species since they were based on a few characteristics. The artificial system gives equal weightage to vegetative andRead more
The artificial system of classification was mainly based
See lesson vegetative characters or on the androecium structure
(system given by Linnaeus). Such system separated the
closely related species since they were based on a few
characteristics. The artificial system gives equal
weightage to vegetative and sexual characteristics. This
is not convincing because the vegetative characters are
more easily affected by the environment.
Give one word answer for following.
(i) Frond is a leaf-like the organ meant for performing photosynthesis process. (ii) The cell wall in green algae is made up of cellulose (inner layer) and pectose (outer layer).
(i) Frond is a leaf-like the organ meant for performing
See lessphotosynthesis process.
(ii) The cell wall in green algae is made up of cellulose
(inner layer) and pectose (outer layer).
Write some examples of (i) mosses (ii) liverworts (iii) pteridophytes.
(i) Mosses Funaria, Polytrichum, Sphagnum (ii) Liverworts Riccia, Marchantia, Porella, Pellia (iii) Pteridophytes Selaginella, Adiantum, Dryopteris, Equisetum.
(i) Mosses Funaria, Polytrichum, Sphagnum
See less(ii) Liverworts Riccia, Marchantia, Porella, Pellia
(iii) Pteridophytes Selaginella, Adiantum, Dryopteris,
Equisetum.
How do gametophytes of pteridophytes germinate?
The megaspores and microspores germinate and give rise to gametophytes.
The megaspores and microspores germinate and give rise
See lessto gametophytes.
Which pteridophytes are useful in nitrogen-fixation and how?
Azolla is a water fern. having a symbiotic association with nitrogen-fixing cyanobacterium Anabaena. It is introduced into paddy fields to function as biofertilliser.
Azolla is a water fern. having a symbiotic association with
See lessnitrogen-fixing cyanobacterium Anabaena. It is introduced
into paddy fields to function as biofertilliser.
Write few important features of mosses.
Features of mosses (i) Erect, radially symmetrical leafy body produced from filamentous or thalloid juvemle Stage is called protonema. (ii) They bear multicellular branched rhizoids. (iii) Sporophyte contains large amount of green tissue and is partially dependent upon the gametophyte.
Features of mosses
See less(i) Erect, radially symmetrical leafy body produced from
filamentous or thalloid juvemle Stage is called
protonema.
(ii) They bear multicellular branched rhizoids.
(iii) Sporophyte contains large amount of green tissue and
is partially dependent upon the gametophyte.