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

Cleavage polyembryony occurs in

• Pinus

• Mini Cycas

• Cycas

• Ephedra

In Cycas, pollination takes place in

• 3- celled stage

• 4- celled stage

• 2- celled stage

• 1- celled stage

205.

Nucellus forms which of the following part of fruit?

• Seed coat

• Perisperm

• Seed

• Raphe

Growth of pollen tube towards embryo sac is

• geotropism

• thigmotaxis

• chemotaxis

• All of these

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