Question

If in a sphenopsida member number of chromosomes in its
scaly leaves is 24, what will be the number of chromosomes
in its stem cells, spores, and prothallus respectively?​

Answer 1

Answer:

The diploid number of the angiospermic plant is 24. So, as 2n=24, n=12. Pollen grains are haploid. Hence, the number of chromosomes in pollen grains will be 12. Endosperm is triploid, so it will have 3n=36 chromosomes and integument is diploid in nature so the number of chromosomes will be 2n=24 .

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Answer 2

The number of chromosomes in stem cells, spores, and prothallus are 24, 12, and 12.

• Stems of plants are diploid somatic cells. Hence, the cells will contain 2n number of chromosomes which is 24.
• Spores and prothallus are haploid. Hence, the chromosome number in these structures is n.
• Thus, the number of chromosomes = 24/2
• The number of chromosomes in spores and prothallus is 12.
• Sphenopsida is the category of pteridophytes. These plants have their parts differentiated into true stems, cells, and leaves.
• An example of the sphenopsida plant is equistem.
• The diploid number of chromosomes usually represents the number of chromosomes in somatic cells. These are 2n.
• The haploid number of chromosomes is n in number. This set is present in the gametes of the organisms. The fusion of gametes to form a new organism gets back 2n number of chromosomes.

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