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Biology · HSEXUAL REPRODUCTION IN FLOWERING PLANTS

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What is the ploidy level of the Primary Endosperm Nucleus (PEN) and the Zygote in a typical angiosperm, respectively?

  1. A
    Diploid (\( 2n \)) and Triploid (\( 3n \))
  2. B
    Triploid (\( 3n \)) and Diploid (\( 2n \))
  3. C
    Haploid (\( n \)) and Diploid (\( 2n \))
  4. D
    Triploid (\( 3n \)) and Haploid (\( n \))
View Answer & Solution

Correct answer · Option B

Triploid (\( 3n \)) and Diploid (\( 2n \))

Explanation

PEN is formed by the fusion of three haploid nuclei (one male gamete + two polar nuclei), so it is triploid (\( 3n \)). The zygote is formed by syngamy (male gamete + egg cell), so it is diploid (\( 2n \)).
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