Simulation · Biology · Class 12
Ploidy map of the fertilised ovule
"Ploidy map of the fertilised ovule" is a free, interactive Class 12 Biology simulation for NEET, built on the lesson "Double fertilisation" in Sexual Reproduction in Flowering Plants. Tap each part of the ovule, and the two products of fertilisation below it. The chromosome count uses the plant's 2n on the slider. Gametes, egg apparatus, antipodals and polar nuclei are n; nucellus, integuments (seed coat) and the zygote (embryo) are 2n; the PEN and endosperm are 3n.
From the lesson Double fertilisation in Sexual Reproduction in Flowering Plants. Change the values and watch what happens.
Ploidy map of the fertilised ovuleBiology · Class 12
The idea behind it
NCERT §1.3
- Inside the synergid the pollen tube releases its two male gametes into the synergid's cytoplasm.
- One male gamete fuses with the egg nucleus: this is syngamy, and it gives a diploid zygote.
- The other male gamete fuses with the two polar nuclei in the central cell, giving a triploid primary endosperm nucleus (PEN). Because three haploid nuclei fuse, this is called triple fusion.
- Two fusions, syngamy and triple fusion, in one embryo sac make up double fertilisation, an event unique to flowering plants.
- After triple fusion the central cell becomes the primary endosperm cell (PEC), which develops into the endosperm; the zygote develops into the embryo.
Questions
2 answers
- What does the "Ploidy map of the fertilised ovule" simulation show?
- Tap each part of the ovule, and the two products of fertilisation below it. The chromosome count uses the plant's 2n on the slider.
- Is this simulation free?
- Yes. It is free and runs in the browser on a phone or a laptop. It belongs to the lesson "Double fertilisation" in Sexual Reproduction in Flowering Plants (Class 12 Biology).
Embed this simulation
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