Fertilisation of the egg takes place inside the _____. 

The correct answer is Embryo sac.

Key Points

• Fertilisation in plants occurs inside the embryo sac, which is located within the ovule of the flower.
• The embryo sac is the female gametophyte of flowering plants and contains the egg cell ready for fertilization.
• After pollen lands on the stigma of a flower, it germinates, and a pollen tube grows through the style to reach the ovary and then the ovule.
• The sperm cells travel down the pollen tube and enter the embryo sac, where one sperm cell fertilizes the egg cell, leading to the development of a zygote.
• This process is a crucial step in the sexual reproduction of flowering plants, leading to the formation of seeds.

Additional Information

• Pollen Tube: A structure grown from a pollen grain when it lands on the stigma; it acts as a conduit to transport the sperm cells to the ovule but is not itself the site of fertilization.
• Anther: The part of the stamen where pollen is produced. Pollen grains containing male gametes are released from the anther but fertilization occurs elsewhere.
• Stigma: The part of a flower that receives the pollen. Although critical for the initiation of fertilization by capturing pollen, the stigma is not the site of fertilization.