Multiple Choice QuestionsA prokaryoticv autotrophic nitrogen-fixing symbiont is found inÂ
Cycas
Cicer
Pisum
Pisum
A.
Cycas
The coralloid root of cycas is symbiotically associated with nitrogen fixing blue -green algae, Anabaena Cycadae and Nostoc punctiforme. These blue-green algae (Cyanobacteria) are prokaryotic, photosynthetic and autotrophic.
The unequivocal proof of DNA as the genetic material came from the studies on aÂ
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
The chief water conducting elements of xylem in gymnosperms areÂ
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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