Class 11 Biology - Chapter Plant Kingdom NCERT Solutions | The heterosporous pteridophytes show cer
The heterosporous pteridophytes show certain characteristics, which are precursor to the seed habit in gymnosperms. Explain.
In majority of Pteridophytes, all the spores are similar, they are known as homosporous. But genera like Selaginella. Sylvania, Marsilea etc. produce different kind of spores that are microspores and megaspores. These are known as Heteroporous.
The Heterosporous Pteridophytes show certain characteristics that are precursor to the seed habit in Gymnosperms are as follows:
- One of such characteristic is the development of embryo inside the female gametophyte.
- Evolutionary Heterospory
- The decrease in the number of Megaspore to one.
More Questions From Class 11 Biology - Chapter Plant Kingdom
- Q:- Write a note on economic importance of algae and gymnosperms.
- Q:- What is heterospory? Briefly comment on its significance. Give two examples.
- Q:- Explain briefly the following terms with suitable examples:-
(i) protonema
(ii) antheridium
(iii) archegonium
(iv) diplontic
(v) sporophyll
(vi) isogamy - Q:- Differentiate between the following:-
(i)red algae and brown algae
(ii) liverworts and moss
(iii) homosporous and heterosporous pteridophyte
(iv) syngamy and triple fusion - Q:- What is the basis of classification of algae?
- Q:-
Mention the ploidy of the following:
protonemal cell of a moss;
primary endosperm nucleus in dicot,
leaf cell of a moss;
prothallus cell of a fern;
gemma cell in Marchantia;
meristem cell of monocot,
ovum of a liverwort, and
zygote of a fern.
- Q:- Name three groups of plants that bear archegonia. Briefly describe the life cycle of any one of them.
- Q:- Describe the important characteristics of gymnosperms.
- Q:- Match the followings (column I with column II)
Column I Column II
(a) Chlamydomonas (i) Moss
(b) Cycas (ii) Pteridophyte
(c) Selaginella (iii) Algae
(d) Sphagnum (iv) Gymnosperm - Q:- When and where does reduction division take place in the life cycle of a liverwort, a moss, a fern, a gymnosperm and an angiosperm?
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