CBSE 2024 · Region 5 · Set 1 · Q25 · 3 marks
If the cells in the leaves of a maize plant contain $\displaystyle 10$ chromosomes each, write the number of chromosomes in its endosperm and zygote. Name and explain the process by which an endosperm and a zygote are formed in maize.
Marking-scheme solution
• Endosperm – $\displaystyle 15$ chromosomes
Zygote – $\displaystyle 10$ chromosomes
• Endosperm is formed by the process of triple fusion, the fusion of two
polar nuclei with one male gamete,
Zygote is formed by the process of syngamy, the fusion of egg cell
with a male gamete.Sexual Reproduction in Flowering PlantsDouble FertilisationApplyshort_answermedium
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CBSE Class 12 Biology past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.