Draw the embryo sac of a flowering plant and label the parts:
(i) Which guides the entry of pollen tube ?
(ii) Which develops into endosperm ?
(iii) Which fuses with male gamete to form zygote ?

Explanation

### Step-by-Step Solution:

1. **Draw the Embryo Sac**: Begin by sketching the structure of the embryo sac, which is typically a seven-celled structure found within the ovule of flowering plants. The embryo sac consists of one egg cell, two synergids, three antipodal cells, and two polar nuclei.

2. **Label the Parts**:
- **Synergids**: These are located at the micropylar end of the embryo sac and are responsible for guiding the entry of the pollen tube. They secrete chemicals that attract the pollen tube.
- **Polar Nuclei**: Found in the center of the embryo sac, these two nuclei fuse with a male gamete to form the triploid endosperm. This endosperm provides nourishment to the developing embryo.
- **Egg Cell**: This is the female gamete located near the synergids. It fuses with the male gamete (from the pollen) to form the zygote.
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