Multiple Choice QuestionsA prokaryoticv autotrophic nitrogen-fixing symbiont is found in
Cycas
Cicer
Pisum
Pisum
The unequivocal proof of DNA as the genetic material came from the studies on a
I) The sporophyte in liverworts is more elaborate than that in mosses
II) Salvinia is heterosporous
III) The life -cycle in all seed - bearing plants is diplontic
IV) In pinus male and female cones are borne on different trees
Statements (I) and (III)
Statement (I) and (IV)
Statements (II) and (III)
Statements (II) and (III)
Selaginella and Salvinia are considered to represent a significant step towards evolution of seed habit because
female gametophyte is free and gets dispersed like seeds
female gametophyte lacks archegonia
megaspores possess endosperm and embryo surrounded by a seed coat
megaspores possess endosperm and embryo surrounded by a seed coat
D.
megaspores possess endosperm and embryo surrounded by a seed coat
Selaginella and Salvinia are heterosporous as they produce two kinds of spores - micro (small) spores and macro (large) spores. The microspores and megaspores germinate and give rise to male and female gametophyte in these plants and retained on the parent sporophytes for variable periods. The development of zygotes into young embryos takes place within the female gametophytes. This event is the precursor to the seed habit considered to an important step in evolution.
The chief water conducting elements of xylem in gymnosperms are
vessels
fibres
tansfusion tissue
tansfusion tissue
Male and female gametophytes are independent and free - living in
mustard
castor
Pinus
Pinus
The scutellum observed in a grain of Wheat or maize is comparable to which part of the seed in other monocotyledons?
Cotyledon
Endosperm
Aleurone layer
Aleurone layer
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