Question

Described the structure of typical embryo sac found in flowering plants. Why it is generally referred to as monosporic

Answer 1

Answer:

Flowering plants and monosporic plants

Explanation:

One mega-spore is functional while the other three degenerate.

The single functional mega-spore develops into the female gametophyte or embryo sac,This kind of development is called monosporic development.

The nucleus of the functional mega-spore divides mitotically to form 2 nuclei, which move towards the opposite ends, forming a 2-nucleate embryo sac.

Two more mitotic divisions ensue, leading to the formation of 4-nucleate and 8-nucleate embryo sacs.

After the 8-nucleate stage, the cell walls are laid down and the typical female gametophyte (embryo sac) gets organised.

Six of the 8-nuclei get surrounded by the cell wall and the remaining two, called polar nuclei, are situated below the egg apparatus in the large central cell.

Three of the six cells are placed at the microscopy end and constitute the egg apparatus

The synergids have special thickenings at the micropylar end. These are together called the filiform apparatus. It helps in leading the pollen tubes into the synergids.

Three cells are at the chalazal end, and are called antipodal cells. A typical angiosperm[flowering plant] female gametophyte is 7-celled and 8-nucleated at maturity.

Answer 2

The structure of typical embryo sac found in flowering plants:

• One mega-spore is functional while the other three degenerates.
• The single performance mega-spore matures into the female gametophyte or embryo sac, this kind of development is known as monosporic development.
•   The nucleus of the functional mega-spore breaks mitotically to develop 2 nuclei, which passes towards the opposite ends, forming a 2-nucleate embryo sac.
• Two more mitotic divisions occur, leading to the composition of 4-nucleate and 8-nucleate embryo sacs.
• Six of the "8-nuclei" get surrounded by cell wall and also remaining two, called as "polar nuclei", are situated below of the "egg apparatus" in the "large central cell".

To know more:

What is monosporic development?

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