Question

After double fertilisation, embryo sac/ ovule comes to have

• A. $1$ haploid and $1$ triploid cell
• B. $1$ diploid and $1$ triploid cell
• C. $2$ haploid and $1$ triploid cell
• D. $1$ diploid and $1$ haploid cell

Answer 1

The correct option is B $1$ diploid and $1$ triploid cell

Embryo sac after double fertilisation
After double fertilisation, the embryo sac or ovule consists of a diploid zygote and a triploid primary endosperm nucleus.

• One of the two male gametes released from the pollen tube fertilises the egg cell to produce a diploid zygote. It develops into the embryo.
• Another male gamete fertilises the diploid central cell (containing the secondary nucleus formed due to fusion of polar nuclei) of the embryo sac to produce a triploid primary endosperm cell (PEC). PEC contains the primary endosperm nucleus (PEN) which divides and develops into the endosperm.
• The synergids and antipodal cells disintegrate after fertilisation.

Final answer
(b) $1$ diploid and $1$ triploid cell