Short Answer Type
Long Answer TypeWhen and where does reduction division take place in the life cycle of a liverwort, a moss, a fern, a gymnosperm and an angiosperm?
Name three groups of plants that bear archegonia. Briefly describe the life cycle of any one of them.
Short Answer TypeMention the ploidy of the following: protonemal cell of a moss; primary endosperm nucleus in dicot, leaf cell of a moss; prothallus cell of a ferm; gemma cell in Marchantia; meristem cell of monocot, ovum of a liverwort, and zygote of a fern.
Long Answer TypeShort Answer TypeWhat is heterospory? Briefly comment on its significance. Give two examples.
Heterospory is a phenomenon in which two kinds of spores are produced by the same plant. The spores differ in size. The smaller one is called microspore and the larger one is known as megaspore. The microspore germinates to form the male gametophyte and the megaspore germinates to form the female gametophyte.
Heterospory is thus considered an important step in evolution as it is a precursor to the seed habit. Moreover, the spores or gametes are protected and well-nourished within the separate sporangium and thus protects them from harsh conditions like desiccation etc.
Long Answer TypeExplain briefly the following terms with suitable examples:
(i) protonema
(ii) antheridium
(iii) archegonium
(iv) diplontic
(v) sporophyll
(vi) isogamy
Short Answer Type
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