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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
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:
Where does the germination of the pollen grain take place and how?
Explain double fertilization and its significance.
Even though each pollen grain has 2 male gametes, why at least 20 pollen grains are required to fertilize 20 ovules in a particular carpel?
Describe the process of double fertilization.
Long Answer Question:
Draw a labeled diagram of the L.S. of anatropous ovule and list the components of the embryo sac and mention their fate after fertilization.
Caruncle develops from
Define triple fusion.
Write a short note on Heterostyly.
By which of the following the megasporangium proper of an angiosperm ovule is represented?
In angiosperms, for formation of which of the following triple fusion is necessary?
Identify the function of filiform apparatus.
Identify the CORRECT statement with reference to cellular endosperm.
Double fertilization is fusion of ______.
The female gametophyte of a typical dicot at the time of fertilisation is ______.
Can an unfertilised, apomictic embryo sac give rise to a diploid embryo? If yes, then how?
Which are the three cells found in a pollen grain when it is shed at the three celled stage?
Name the following:
A diploid nucleus in central cell of embryo sac in plants.
Name the nuclei involved in triple fusion.
