AGR232_Gametogenesis and Fertilization Process in Plants

AGR232

Gametogenesis and Fertilization in Plants

Today we will learn what happen inside the reproduction system of male and female flower.

Multiple Select

Male flower consists of....

• Stigma

• Anther

• Style

• Ovary

• Filament

Multiple Select

Female flower consists of....

• Stigma

• Filament

• Style

• Ovary

• Anther

CORRECT!

• FEMALE part of flower also called as Gynoecium.

• MALE part of flower is called as Androecium

• Refer to the next slide for details.

Gametogenesis

Have you ever heard about this word?

What does it means by gametogenesis?

Multiple Select

What do you think Gametogenesis means?

• The development of female and male gametes.

• The development of female and male gametes.

Bravo! You answer is correct!

*clap clap

How male gametes and female gametes was formed in flowers?

• The male and female gametes need to undergo the process of gametogenesis which is called as microgametogenesis for male and megagametogenesis for female.

Where is the process of Gametogenesis will take place?

• The process will take place in....

• Male gametes = Pollen sac

• Female gametes = Ovule

Development of Pollen & The Male Gametes

• The male organ flower are the androecium.

• The anther usually is made up of four (4) elongated pollen sacs.

• Each pollen sac contains a mass of dividing cells that called as microsporocytes, also known as pollen grains or pollen mother cell.

• Each microsporocycte divide by meiosis to form 4 haploid (n) or microspore.

Development of Pollen & The Male Gametes (cont..)

• Two nucleus (2) of each microspore then divide by mitosis to form a two unequal cells (generative and vegetative cell).

• The vegetative cell (also known as pollen tube cell) will form a tube from the stigma to the ovary.

• The generative cell forms male gametes/sperm cells.

That's all about what happen in male reproductive organ and the development of male gametes.

Should we move to female gamete formation? Let's go!

The image on previous slide explains about what is inside the ovule. Each cell has a distinct role.

Synergid cells function as the producing center of the signals which guide the pollen tube cell.

Antipodal cells is to provide nourishment to the egg cell.

Polar nuclei are the two nuclei situated at the central position of the embryo sac that fuse with the male nucleus.

FERTILIZATION is the fusion of the male and female gametes tp produce a zygote.

Remember:

The pollen grain produce the male gametes.

Embryo sac produces an egg cell and polar nuclei.

Multiple Choice

Fertilization is the process by which an...

• Egg and pollen combine

• Embryo grows into a plant

• Animal carries pollen between plants

Multiple Choice

Which of the following is describes Self-Pollination?

• Pollen grains are transferred from anther to stigma of another flower.

• Pollen grains are transferred from filament to stigma of the same flower.

• Pollen grains are transferred from anther to stigma of the same flower.

• Pollen grains are transferred from stigma to anther of the same flower.

Multiple Choice

They enclose the egg cells inside the ovaries.

• ovules
• anther
• seeds
• stamen

Multiple Choice

The part of the flower on which the pollen grains land.

• pistil
• stamen
• sepals
• stigma

End.

Any questions?