Multiple Choice QuestionsIn Cycas, pollination takes place in
3- celled stage
4- celled stage
2- celled stage
1- celled stage
In Pinus, male cone bears a large number of
ligules
anthers
micro- sporophylls
mega- sporophylls
C.
micro- sporophylls
Micro-sporophylls or mega- sporophylls are the leaf like structures on which microsporangia and megasporangia are borne on the same plant of Pinus.
(a) Male cones (microstrobili)- are small
(b) Female cones (ovulate strobili)- are large
Each male cone consists of an elongated axis containing number of micro- sporophylls. Underside of same develops 2 microsporangia and gets filled with microspores (pollen grains).
Anther or microsporangium is the male reproductive structure of angiosperm.
Ligule, is a tongue- like membranous outgrowth, present on upper surface, near the base of the microphyllous leaf in pteridophytes.
In Cycas, pollination takes place in
3- celled stage
4- celled stage
2- celled stage
1- celled stage
Perisperm is
degenerate part of synergids
peripheral part of endosperm
degenerate part of secondary nucleus
remnant of nucellus
An orthotropus ovule is one in which micropyle and chalaza are
in straight line of funiculus
parallel of funiculus
at right angles to funiculus
oblique to funiculus
In a type of apomixis known as adventive embryony, embryos develop directly from the
nucellus or integuments
synergids or antipodals in an embryo sac
accessory embryo sacs in the ovule
zygote
Through which cell of the embryo sac, does the pollen tube enter the embryo sac?
Egg cell
Central cell
Persistant synergid
Degenerated synergid
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