Question

In an angiospermic anther, if a
pollen sac have 35 sporogenous
cells then what will be the number
of male gametes that can be
produced from anther
O 1000
O
1140
O 1120
o 2240​

Answer 1

☆Information required:

》Sporogenous cells: these are the initials of microsporangia, which converted into spore mother cells on maturity.

• Spore mother cells undergo meiosis to form four pollen tetrads, which on dehiscence form 4- pollen grains.
• In majority of plants,pollen grains on germination at stigma, release a pollen tube from their intine portion of wall.
• during the elongation of pollen tube, the germinative cell of pollen grain divides to form 2- male gametes.

》anther of male organ is consists of 4-chambers of pollen sacs.

• inside the pollen sacs sporogenous cells are present inside which meiosis occurs.

☆Solution:

》1 spore mother cell = 4 pollen grains

》1 pollen grain = 2 male gametes.

》1 spore mother cell = (4×2) = 8-male gametes.

》1 anther = 4 pollen sac

---------------

• 1 pollen sac = 35 sporogenous cells (given)

• Total sporogenous cells in the anther

》4× 35 = 140.

• Total male gametes produced by the spirogenous cells

》140×8 = 1120

$\bigstar$ the numberof male gametes that can be produced from the given anther is 1120.

Answer 2

Answer:

The number of male gametes that can be produced from the anther is 1120.

Explanation:

• Sporogenous cells are the initials of microsporangia, which are later converted into spore mother cells or pollen mother cells (PMCs) on maturity.

• Spore mother cells undergo reductional division i.e. meiosis to form pollen or microspore tetrad, which on dehiscence form 4 microspores or pollen grains.

• In most angiosperms, pollen grains on germination at the stigma, release a pollen tube from the intine of the wall.

• During the elongation of the pollen tube, the generative cell of the pollen grain divides to form 2 male gametes.

• The anther of the male reproductive structure consists of 4 chambered pollen sacs, inside which the sporogenous cells are present where meiosis takes place.

• 1 spore mother cell or PMC gives 4 pollen grains which mean 1 pollen grain carries 2 male gametes.

• Thus 1 spore mother cell = (4×2) = 8 male gametes. Now 1 anther = 4 pollen sac

• As per the given data, 1 pollen sac = 35 sporogenous cells

• Thus the total sporogenous number of cells in the anther= 4× 35 = 140.

• The total number of male gametes produced by the sporogenous cells will be 140×8 = 1120

Therefore the number of male gametes that can be produced from the anther is 1120.

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