Plant reproduction — A/L Biology

How do I practise Plant reproduction?

1 question with a worked solution

1. In the angiosperm embryo sac during double fertilization, what products are formed by the fusion of the two male gametes with their respective targets?
   1. A) Diploid zygote (2n) and triploid primary endosperm nucleus (3n)
   2. B) Haploid embryo (n) and diploid endosperm (2n)
   3. C) Triploid zygote (3n) and diploid seed coat (2n)
   4. D) Diploid embryo (2n) and haploid antipodal tissue (n)
   Check my answer

   Correct answer: A) Diploid zygote (2n) and triploid primary endosperm nucleus (3n)

   One sperm nucleus (n) fuses with the egg cell nucleus (n) to form the diploid zygote (2n), while the second sperm nucleus (n) fuses with the diploid central cell / two polar nuclei (2n) to form the triploid primary endosperm nucleus (3n).

   Show worked solution

   Step 1: Syngamy: 1 male gamete (n) + 1 egg nucleus (n) → 2n zygote. Step 2: Triple fusion: 1 male gamete (n) + 2 polar nuclei (2n) → 3n primary endosperm nucleus. Step 3: Together these two events constitute double fertilization. Answer: Diploid zygote (2n) and triploid primary endosperm nucleus (3n).
   Modelled on: the A/L Biology examination pattern

Get this auto-marked

Next in the syllabus

Where does Plant reproduction fit in the syllabus?

Year 1 · Term 3