The diagram given below represents the sectional view of

Which of the following pairs of plant parts are both haploid

Choose correct sentence.

$(I)$ Nucleus of the functional megaspore divides meiotically to form two nuclei.

$(II)$ After $8$ nucleate stage, cell walls are laid down leading to organization of typical female gametophyte

$(III)$ The egg apparatus, consists of two synergids and one egg cell.

$(IV)$ Three cells are at the chalaza end are called antipodal cells.

Fertilization of egg takes place inside

Part of the gynoecium which receives the pollen is called