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प्रश्न
Answer the following question.
Pollen banks are playing a very important role in promoting plant breeding programs the world over. How are pollens preserved in the pollen banks? Explain. How are such banks benefitting our farmers? Write any two ways.
उत्तर
Pollen banks are used to store pollens for a very long period of time in viable conditions. Pollens are preserved in a bank using cryopreservation i.e., they are stored in a viable condition in low-temperature conditions (-196 degree Celsius) using liquid nitrogen.
The important applications of pollen banks for our farmers are the following:
- To preserve the agricultural biodiversity in the form of preservation of valuable genetic resources.
- These pollens can be used in various crop hybridization breeding programs, biochemical and physiochemical studies such as the study of allergens, etc.
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संबंधित प्रश्न
A flower of brinjal plant following the process of sexual reproduction produces 360 viable seeds.
Answer the following questions giving reasons:
(a) How many ovules are minimally involved?
(b) How many megaspore mother cells are involved?
(c) What is the minimum number of pollen grains that must land on stigma for pollination?
(d) How many male gametes are involved in the above case?
(e) How many microspore mother cells must have undergone reduction division prior to dehiscence of anther in the above case?
Arrange the following terms in the correct developmental sequence:
Pollen grain, sporogenous tissue, microspore tetrad, pollen mother cell, male gametes.
Give four anatomical differences between a dicot leaf and monocot leaf.
Proximal end of the filament of stamen is attached to the ______.
Haploid plant cultures are got from ______.
Several pollen grains form a unit designated as pollinium in Family ______.
The three cells found in a pollen grain when it is shed at 3-celled stage are ______.
In Zostera, the pollen grains are long and ribbon-like and released inside the water.
Lateral conjugation in Spirogyra takes place in the cells of ______.
Draw a neat and well labelled diagram of T.S. of anther.
