Sexual reproduction in flowering plants begins with

1. The sexual cycle starts inside the flower with meiosis-based gamete formation. 2. Microspore mother cells produce pollen grains (male gametes), megaspore mother cells produce egg cells (female gametes). 3. Fertilisation follows and ultimately produces a seed. _Source: Maharashtra Balbharati Std XII Biology, Ch 1 "Reproduction in Lower and Higher Plants" §1.4_