What are the steps from fertilization to implantation?
During fertilization, the sperm and egg unite in one of the fallopian tubes to form a zygote. Then the zygote travels down the fallopian tube, where it becomes a morula. Once it reaches the uterus, the morula becomes a blastocyst. The blastocyst then burrows into the uterine lining — a process called implantation.
How does fertilization occur in gymnosperms?
Gymnosperm Fertilization Fertilization occurs when pollen grains (male gametophytes) are carried by the wind to the open end of an ovule, which contains the eggs, or female gametophyte. The sperm cells within the pollen tube then vie to fertilize the egg.
What is the significance of double fertilization?
What is the importance of double fertilization? Double fertilization provides stimulus to the plant as the ovary develops into a fruit. Due to the fusion of male and female haploid gametes, a diploid zygote is formed. The zygote develops into an embryo, giving rise to a new plant.
What happens to the pollen tube after fertilization?
Once the pollen tube reaches an ovule, it bursts to deliver the two sperm cells. One of the sperm cells fertilizes the egg cell which develops into an embryo, which will become the future plant.
How does pollination and fertilization occur in gymnosperms?
In gymnosperms, pollination involves pollen transfer from the male cone to the female cone. Upon transfer, the pollen germinates to form the pollen tube and the sperm for fertilizing the egg.
What is double fertilization ncert12?
Ans: The process of fusion of one male gamete with egg to form diploid zygote and another male gamete with the polar nuclei or secondary nucleus to form primary endosperm nucleus is called double fertilization.
What is double fertilization 10th?
Double fertilization : It occurs when one male nucleus fertilizes (fuses) with egg cell to form zygote cell and other male nucleus fuses (fertilizes) with two polar nuclei to cause triple fusion.
Why pollen is important in fertilization?
In order to reproduce, plants need to be pollinated, and this is the reason that they produce pollen. Without pollination, plants will not produce seeds or fruit, and the next generation of plants. Without it, our plants wouldn’t make the produce that we eat.
How do pollen grains reach the ovary?
A pollen tube grows through the tissues of the flower until it reaches an ovule inside the ovary . The nucleus of the pollen grain (the male gamete ) then passes along the pollen tube and joins with the nucleus of the ovule (the female gamete). A pollen tube grows from the stigma to the ovary.