Multiple Choice QuestionsIn 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
Ubisch bodies are present in
pollen tube
pollen grain
microspore
tapetum
D.
tapetum
Tapetum is the innermost layer of another wall which surrounds the sporogenous tissue. These cells are nutritive in function. also, ubisch bodies are present that helps in the formation of microspore wall or exine of pollen grains.
Pollen grain (microspore) is a round haploid structure from which gametophyte is developed.
Pollen tube helps in carrying male gametes to female gametes for fertilisation.
In 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
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
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