Discuss with your teacher about:
(i) haploid insects and lower plants where cell-division occurs
(ii) some haploid cells in higher plants where cell-division does not occur.
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(i) In some insects and lower plants, fertilization is immediately followed by zygotic meiosis, which leads to the production of haploid organisms. This type of life cycle is known as haplontic life cycle.
(ii) The phenomenon of polyploidy can be observed in some haploid cells in higher plants in which cell division does not occur. Polyploidy is a state in which cells contain multiple pairs of chromosomes than the basic set. Polyploidy can be artificially induced in plants by applying colichine to cell culture.
(ii) The phenomenon of polyploidy can be observed in some haploid cells in higher plants in which cell division does not occur. Polyploidy is a state in which cells contain multiple pairs of chromosomes than the basic set. Polyploidy can be artificially induced in plants by applying colichine to cell culture.
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The discussion is provided below :
(i) Some of the insects that are haploid in nature undergoing cell division are : wasps, honey bees and ants.
In lower plants, like in Chlamydomonas, Volvox, Spirogyra, etc, the mitotic type of division of cell occurs when the gametophyte is formed from the haploid kind of spores.
And the meiosis type of cell division happens in zygote for the production of spores of haploid nature.
(ii) The synergids and antipodal cells present in the embryo sac of the angiosperns are haploid but no division of cell occurs there.
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