Double Fertilisation Flashcards
What is double fertilisation?
Double fertilisation is a process in flowering plants where one sperm fertilizes the egg, forming a zygote, while another sperm fuses with two polar nuclei to form triploid endosperm.
True or False: Double fertilisation occurs in all plant species.
False
What are the two main products of double fertilisation?
The two main products are the zygote and the triploid endosperm.
Fill in the blank: The structure that contains the ovule and is part of the ovary is called the ______.
carpel
What is the role of the endosperm in seed development?
The endosperm provides nourishment to the developing embryo.
Which part of the flower is responsible for producing pollen?
Anther
What type of cell division produces the male gametes in pollen grains?
Mitosis
True or False: The female gamete is formed from the megasporangium.
True
What is the function of the micropyle in the ovule?
The micropyle allows the entry of pollen for fertilisation.
Multiple Choice: Which of the following structures develops into the seed after fertilisation? A) Ovule B) Anther C) Stigma D) Petal
A) Ovule
What is the fate of the zygote after double fertilisation?
The zygote develops into the embryo.
Fill in the blank: The fusion of one sperm with two polar nuclei results in the formation of ______.
triploid endosperm
Which gamete is produced by the microspore mother cell?
Male gamete (sperm)
True or False: The endosperm is diploid in nature.
False
What is the ploidy level of the endosperm?
Triploid
What triggers the process of double fertilisation?
The germination of pollen and subsequent pollen tube growth.
Multiple Choice: Which of the following is NOT a component of the ovule? A) Integuments B) Nucellus C) Anther D) Megasporangium
C) Anther
What happens to the ovule after fertilisation?
It develops into a seed.
Fill in the blank: The fusion of the sperm cell with the egg cell forms the ______.
zygote
What is the primary function of the ovary in a flower?
To contain and protect the ovules.
True or False: Double fertilisation is exclusive to angiosperms.
True
What is the significance of double fertilisation in flowering plants?
It ensures the simultaneous development of the embryo and its nutrient supply.
Which structure develops from the ovary after fertilisation?
Fruit
Multiple Choice: What is the primary role of the female gametophyte in double fertilisation? A) Transport pollen B) Nourish the embryo C) Produce seeds D) Provide a site for fertilisation
D) Provide a site for fertilisation
What is the first step in the double fertilisation process?
Pollen grain lands on the stigma and germinates.
Fill in the blank: The triploid endosperm is formed by the fusion of one sperm cell with ______ polar nuclei.
two
