Discuss double fertilization.
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Double fertilization is unique to angiosperms:
- Pollination: Pollen grain lands on stigma
- Pollen tube growth: Grows through style, reaches ovule via micropyle
- Gamete discharge: Two male gametes released into embryo sac
- First fertilization (Syngamy): Male gamete + Egg cell → Zygote (2n)
- Second fertilization (Triple fusion): Male gamete + Secondary nucleus (2n) → Primary Endosperm Nucleus (3n)
- Development: Zygote → Embryo; PEN → Endosperm (nourishes embryo)
Suggested Q&A
General · Class 12- GeneralClass 12Electric Field at Centre of Ring with Non-Uniform Charge Distribution. Four quadrants carry linear charge densities: +2λ, −2λ, +λ, −λ. Find electric field at centre.
- GeneralClass 12P°(hexane) = 408 Torr, P°(heptane) = 141 Torr. x(hexane) = 0.300. Find Y₆ and Y₇.
- GeneralClass 122N₂O₅(g) → 4NO₂(g) + O₂(g). Initial P = 50 mmHg; P at 30 min = 87.5 mmHg. Find P at 60 min.
- GeneralClass 12What is the difference between psychosis and neurosis?
- GeneralClass 12What is the difference between prism and a pyramid?
- GeneralClass 12What is the difference between phrase and clause?