Question

explain double fretilisation in plant ​

Answer 1

Answer:

Explanation:

The flower may be unisexual (papaya,

watermelon) when it contains either stamens

or carpels or bisexual (Hibiscus, mustard)

when it contains both stamens and carpels.

Stamen is the male reproductive part and it

produces pollen grains that are yellowish

in colour. You must have seen this yellowish

powder that often sticks to our hands if we

touch the stamen of a flower. Carpel is

present in the centre of a flower and is the

female reproductive part. It is made of three

Longitudinal section of  Flower  Germination of pollen on  stigma

parts. The swollen bottom part is the ovary, middle elongated part is the

style and the terminal part which may be sticky is the stigma. The ovary

contains ovules and each ovule has an egg cell. The male germ-cell

produced by pollen grain fuses with the female gamete present in

the ovule. This fusion of the germ-cells or fertilisation gives us the

zygote which is capable of growing into a new plant.

Thus the pollen needs to be transferred from the stamen to the

stigma. If this transfer of pollen occurs in the same flower, it is

referred to as self-pollination. On the other hand, if the pollen is

transferred from one flower to another, it is known as crosspollination. This transfer of pollen from one flower to another is

achieved by agents like wind, water or animals.

After the pollen lands on a suitable stigma, it has to reach the

female germ-cells which are in the ovary. For this, a tube grows

out of the pollen grain and travels through the style to reach the

ovary.  After fertilisation, the zygote divides several times to form an

embryo within the ovule. The ovule develops a tough coat and is

gradually converted into a seed. The ovary grows rapidly and ripens

to form a fruit. Meanwhile, the petals, sepals, stamens, style and

stigma may shrivel and fall off. Have you ever observed any flower

part still persisting in the fruit? Try and work out the advantages

of seed-formation for the plant. The seed contains the future plant

or embryo which develops into a seedling under appropriate

conditions. This process is known as germination

Answer 2

Explanation:

Double fertilization is a complex fertilization mechanism of flowering plants (angiosperms). This process involves the joining of a female gametophyte (megagametophyte, also called the embryo sac) with two male gametes (sperm). It begins when a pollen grain adheres to the stigma of the carpel, the female reproductive structure of a flower. The pollen grain then takes in moisture and begins to germinate, forming a pollen tube that extends down toward the ovary through the style. The tip of the pollen tube then enters the ovary and penetrates through the micropyle opening in the ovule. The pollen tube proceeds to release the two sperm in the megagametophyte.

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