CBSE
Multiple Choice QuestionsGrowth of pollen tube towards embryo sac is
geotropism
thigmotaxis
chemotaxis
All of these
In Cycas, pollination takes place in
3- celled stage
4- celled stage
2- celled stage
1- celled stage
Cleavage polyembryony occurs in
Pinus
Mini Cycas
Cycas
Ephedra
Double fertilization occurs in
Riccia
Pteridium
Cycas
Capsella
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 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
Nucellus forms which of the following part of fruit?
Seed coat
Perisperm
Seed
Raphe
In Pinus, male cone bears a large number of
ligules
anthers
micro- sporophylls
mega- sporophylls
Ubisch bodies are present in
pollen tube
pollen grain
microspore
tapetum
