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.
Perisperm is
degenerate part of synergids
peripheral part of endosperm
degenerate part of secondary nucleus
remnant of nucellus
In Cycas, pollination takes place in
3- celled stage
4- celled stage
2- celled stage
1- celled stage
In Cycas, pollination takes place in
3- celled stage
4- celled stage
2- celled stage
1- celled stage
In gymnosperms, the pollen chamber represents
A cell in the pollen grain in which the sperms are formed
A cavity in the ovule in which pollen grains are stored after pollination
An opening in the megagametophyte through which the pollen tube approaches the egg
The microsporangium in which pollen grains develop
