List the changes observed in an angiosperm flower subsequent to pollination and fertilisation.

Explanation

### Step-by-Step Solution:

1. **Pollination**: After pollination, pollen grains land on the stigma of the flower, leading to the formation of a pollen tube that grows down through the style to reach the ovule.

2. **Fertilization**: Once the pollen tube reaches the ovule, it releases two male gametes. One male gamete fuses with the egg cell to form a diploid zygote, while the other fuses with the two polar nuclei to form a triploid primary endosperm nucleus.

3. **Changes in the Embryo Sac**:
- The antipodal cells (three cells at the opposite end of the embryo sac) degenerate.
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