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प्रश्न
Write a short note on Pollen kitt.
उत्तर
Pollenkitt is contributed by the tapetum and coloured yellow or orange and is chiefly made of carotenoids or flavonoids. It is an oily layer forming a thick viscous coating over the pollen surface. It attracts insects and protects damage from UV radiation.
संबंधित प्रश्न
What is triple fusion?
Read the following statement and answer the questions that follow :
"A guava fruit has 200 viable seeds."
(a) What are viable seeds?
(b) Write the total number of :
(i) Pollen grains (ii) Gametes
in producing 200 viable guava seeds.
c) Prepare a flow-chart to depict the post-pollination events leading to viable-seed production in a flowering plant.
(a) Explain the events after pollination leading to the formation of a seed in angiosperms.
(b) Mention the ploidy levels of the cells of different parts of an albuminous seed.
During double fertilization second male gamete fuses with ___________.
What happens to the following after fertilization?
Calyx
What are the advantages of the following in the flower to the plant concerned?
Protruding and easily movable anthers
Given ahead is a diagrammatic sketch of the sectional view of a germinating pollen grain. Study the same and then answer the question that follows:
What happens to the part labelled '5' during the process?
Given ahead is a diagrammatic representation of the process of fertilization. Study the same and then answer the question that follows:
What happens to
i) Ovary
ii) Ovule after fertilisation
What is ‘double fertilization’? Describe it with the help of a neat and well-labeled diagram. Give its importance.
What is the significance of the dispersal of seeds? Give any two points.
What happens to the ovary post fertilization?
Do you think fruits are important for the plant?
The question has four options. Choose the correct answer:
The study of fruits is known as
Size of pollen grain in Myosotis
Male gametes in angiosperms are formed by the division of ______.
In a fertilised embryo sac, the haploid, diploid, and triploid structures are ______.
The female gametophyte of a typical dicot at the time of fertilisation is ______.
Double fertilisation was first discovered in 1898 by ______ in Fritillaria and Lilium.
Name the nuclei involved in triple fusion.
