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Question

Draw a schematic labelled diagram of fertilized embryo sac showing zygote and primary endosperm.

Prabhat Rajore · Accepted Answer

In the mature ovule, within the nucellus towards the micropylar end is a large cell called embryo sac. It is also called female gametophyte. It contains cytoplasm, two free nuclei and six small cells. Two free nuclei fuse to form secondary nucleus. Out of these three cells constitute egg apparatus (two synergids and one oosphere or egg cell). The other three cells lie at chalazal end of embryo sac and are called antipodal cells. They are small and enclosed in thin cell walls.
In egg apparatus egg fuses with male gamete to form zygote or oospore which later gives rise to embryo. Synergids help in fertilization. Secondary nucleus fuses with the second male gamete to form primary endosperm nucleus which later on forms endosperm.
The three antipodal cells degenerate.

Structure of typical embryo sac.

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Sexual Reproduction In Flowering Plants

Draw a schematic labelled diagram of fertilized embryo sac showing zygote and primary endosperm.

Some More Questions From Sexual Reproduction in flowering Plants Chapter

Parthenocarpic fruit is :

The entry of pollen tube into embryo sac through the integuments is termed as :

512 microspores will be formed following meiosis of how many microspore mother cells.

Pollination by water occurs in :

In ................... flowers, the thalamus grows upwards completely enclosing the ovary, and the stamens, petals and sepals are borne above the ovary.

In Calotropis, all the microspores of anther lobe remain united to form

Albuminous seeds store reserve food materials in ....................

Transfer of pollen grains from the anther to the stigma of another flower of same plant is called..............................

The...................direct the growth of pollen tube towards egg apparatus by secreting some chemical substances.

A kind of reproduction in which the new individuals are formed without involvement of meiosis and syngamy.

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