Ploidy in Plant Life Cycles — From Haploid to Triploid
📚 Practice Concept📖 NCERT Source
Mention the ploidy of the following: protonematal cell of a moss; primary endosperm nucleus in dicot; leaf cell of a moss; prothallus cell of a fern; gemma cell in Marchantia; meristem cell of monocot; ovary of a flower; and zygote of a fern.
🎨 Visual Reference
⚠️ The NTA Trap
✗ Common wrong answer
Primary endosperm nucleus is diploid (2n)
✓ The correct framing
Primary endosperm nucleus is TRIPLOID (3n) — formed by triple fusion
💡 Memory hook
Double fertilisation: zygote (2n) + primary endosperm nucleus (3n)
❓ Frequently Asked Questions
What is Ploidy in Plant Life Cycles?
Plant life cycles show alternation of generations between haploid gametophyte and diploid sporophyte. The KEY RULE: gametophyte structures (prothallus, protonema, gemma, gametes) are haploid (n). Sporophyte structures (mature plant body in angiosperms, zygote, embryo) are diploid (2n).
What is the most common NEET trap on Ploidy in Plant Life Cycles?
Common wrong answer: Primary endosperm nucleus is diploid (2n) Correct: Primary endosperm nucleus is TRIPLOID (3n) — formed by triple fusion
How do you remember Ploidy in Plant Life Cycles for NEET?
Double fertilisation: zygote (2n) + primary endosperm nucleus (3n)
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