Define double fertilization? Explain the process with the help of a suitable diagram.
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The female gametophyte of angiosperms (flowering plants), also known as embryo sac is a seven celled and eight nucleate structure.
This structure basically contains one haploid egg cell surrounded by synergids towards the micropylar end, three cells forming antipodals towards chalazal end and polar secondary nuclei towards the center.
During fertilization, the pollen tube enters embryo sac through micropyle and releases two male gametes. Out of which, one male gamete fuses with female gamete (egg cell) forming zygote and the other fuses with polar nuclei forming endosperm. This is called double fertilization as it involves fusion of two male gametes.
The structure of embryo sac and process of double fertilization is described in the diagram
hope it helps u
cheers!
The female gametophyte of angiosperms (flowering plants), also known as embryo sac is a seven celled and eight nucleate structure.
This structure basically contains one haploid egg cell surrounded by synergids towards the micropylar end, three cells forming antipodals towards chalazal end and polar secondary nuclei towards the center.
During fertilization, the pollen tube enters embryo sac through micropyle and releases two male gametes. Out of which, one male gamete fuses with female gamete (egg cell) forming zygote and the other fuses with polar nuclei forming endosperm. This is called double fertilization as it involves fusion of two male gametes.
The structure of embryo sac and process of double fertilization is described in the diagram
hope it helps u
cheers!
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HEY THERE HERE'S UR ANSW3R. ❕❕
⏺Double FERTILISATION◻◻◻◻
It is the plant process , which involves complex FERTILISATION , mechanism of FLOWERING plants ..
refer attachment for the diagram.....
and the proCess here◻◻◻◻◻
⏹This process mainly involves the joining of a female gametophyte, with two male gametes . It begins with a pollen grain adheres to the stigma of CARPEL, , the female reproductive STRUCTURE of a flower ..
⏹ The pollen grain then takes moisture and begins to germinate inside the ovary, forming a pollen tube, which extends down towards the ovary of through the style..
⏹The tip of the pollen tube then enters the ovary and penetrates through the MICROPYLE OPENING the ovule,.
⏹ The pollen tube proceeds to release the two sperm in the mega gametophyte..
⏹The ovules are 8 in number and arranged in the form of 3+2+3 (from top to bottom) i.e 3 antipodal cells, 2 polar central cells, 2 synergids & 1 egg cell. One sperm fertilizes the egg cell and the other sperm combines with the two polar nuclei of the large central cell of the megagametophyte..
⏹ The haploid sperm and haploid egg combine to form a diploid zygote,the process being called syngamy , while the other sperm and the two haploid
⏹ this process is being termed as double FERTILISATION,, it involves another process called TRIPLE FUSION, but its enough here!!!!
↩↩↩hope it helps u⏹⏹
⏺Double FERTILISATION◻◻◻◻
It is the plant process , which involves complex FERTILISATION , mechanism of FLOWERING plants ..
refer attachment for the diagram.....
and the proCess here◻◻◻◻◻
⏹This process mainly involves the joining of a female gametophyte, with two male gametes . It begins with a pollen grain adheres to the stigma of CARPEL, , the female reproductive STRUCTURE of a flower ..
⏹ The pollen grain then takes moisture and begins to germinate inside the ovary, forming a pollen tube, which extends down towards the ovary of through the style..
⏹The tip of the pollen tube then enters the ovary and penetrates through the MICROPYLE OPENING the ovule,.
⏹ The pollen tube proceeds to release the two sperm in the mega gametophyte..
⏹The ovules are 8 in number and arranged in the form of 3+2+3 (from top to bottom) i.e 3 antipodal cells, 2 polar central cells, 2 synergids & 1 egg cell. One sperm fertilizes the egg cell and the other sperm combines with the two polar nuclei of the large central cell of the megagametophyte..
⏹ The haploid sperm and haploid egg combine to form a diploid zygote,the process being called syngamy , while the other sperm and the two haploid
⏹ this process is being termed as double FERTILISATION,, it involves another process called TRIPLE FUSION, but its enough here!!!!
↩↩↩hope it helps u⏹⏹
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