The phenomenon of double fertilisation occur in following steps: (i) In an angiospermic plant, two male gametes are discharged by a pollen tube into the embryo sac. (ii) One of the male gametes fuses with the egg to form a zygote. This process is called syngamy. (iii) Other male gamete fuses with the secondary nucleus to form the primary endosperm nucleus, this process is called triple fusion. (iv) Since, there are two fusions (syngamy and triple fusion), inside an ovule during fertilisation, it is known as double fertilisation
Answers
Dinesh khokhani
(i) In an angiospermic plant, two male gametes are discharged by a pollen tube into the embryo sac.
(ii) One of the male gametes fuses with the egg to form a zygote. This process is called syngamy.
(iii) Other male gamete fuses with the secondary nucleus to form the primary endosperm nucleus, this process is called triple fusion.
(iv) Since, there are two fusions (syngamy and triple fusion), inside an ovule during fertilisation, it is known as double fertilisation