To obtain a haploid callus,one can culture:

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(D) haploid callus is derived from cells that contain only one set of chromosomes $(n)$. In plants,the only cells that are naturally haploid are the g

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Pollen grain

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(D) haploid callus is derived from cells that contain only one set of chromosomes $(n)$. In plants,the only cells that are naturally haploid are the gametophytes,such as pollen grains (microspores) or embryo sacs (megaspores). By culturing pollen grains (microspore culture) on a suitable nutrient medium,the cells undergo division to form a mass of undifferentiated haploid cells known as a haploid callus. Embryos,leaf tissues,and stigmas are diploid $(2n)$ structures and would result in a diploid callus.

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