Megasporangium

Which is the most common type of embryo sac in

angiosperms ?

• Tetrasporic with one mitotic stage of divisions

• Monosporic with three sequential mitotic divisions

• Monosporic with two sequential mitotic

  divisions

• Bisporic with two sequential mitotic divisions

Embryo sac represents

• megaspore

• megagametophyte

• megasporophyll

• megagamete

In majority of angiosperms

• egg has a filiform apparatus

• there are numerous antipodal cells

• reduction division occurs in the megaspore mother cells

• a small central cell is present in that embryo Sac.

Function of filiform apparatus is to

• guide the entry of pollen tube

• produce nectar

• stimulate division of generative cell

• recognise the suitable pollen at stigma

The arrangement of the nuclei in a normal embryo

sac in the dicot plants is

• 3 + 3 + 2

• 2+4+2

• 3 + 2 + 3

• 2+3+3

Examine the figures (A-D) given below and select

the right option out of (a – d), in which all the four

structures A, B, C and D are identified correctly.

• A.Rhizome. B.Sporangiophore

  C. Polar cell D . Globule

• A. Runner B. Archegoniophore

  C. synergid D. Antheridium

• A Offset

  B.Antheridiophore

  C.Antipodals D.Oogonium

Ovule is straight with funiculus, embryo sac, chalaza

and micropyle lying on one straight line. It is

• orthotropous

• anatropous

• campylotropous

• amphitropous

Which one of the following represents an ovule,

where the embryo sac becomes horse-shoe shaped

and the funiculus and micropyle are close to each

other?

• Amphitropous

• Anatropous

• Circinotropous

• Atropous

The ovule of an angiosperm is technically equivalent

to

• megasporangium

• megasporophyll

• megaspore mother cell

• megaspore

Megaspores are produced from the megaspore

mother cells after

• mitotic division

• formation of thick wall

• differentiation

• meiotic division.