Identify the set of cells which have haploid number of chromosomes ?

Egg cell and Synergid cell

The correct answer is (1) Egg cell and Synergid cell.

Egg cell and Synergid cell are both haploid cells, meaning they have one set of chromosomes. They are both found in the female gametophyte (embryo sac) of flowering plants.

The other options are incorrect:

• (2) Egg cell and Nucellar cell: Nucellar cells are diploid cells, meaning they have two sets of chromosomes.
• (3) Zygote and Egg cell: A zygote is a diploid cell, formed by the fusion of two haploid gametes (sperm and egg).
• (4) Zygote and Antipodal cell: Antipodal cells are haploid cells, but zygote is a diploid cell, formed by the fusion of two haploid gametes (sperm and egg).

Therefore, the correct answer is (1) Egg cell and Synergid cell.