Male gametes form in the anther of a flower's stamen

Steps:

• Recall flower structure: stamen includes filament and anther; carpel includes stigma, style, and ovary.
• Male reproductive part is stamen; female is carpel.
• Male gametes (sperm in pollen) develop in anther's pollen sacs via meiosis.
• Match diagram labels to parts; A corresponds to anther.

Why A is correct:

• Anther produces pollen grains containing male gametes, per angiosperm reproduction definition.

Why the others are wrong:

• B: Filament supports anther but does not produce gametes.
• C: Ovary houses female gametes (ovules).
• D: Likely petal or sepal, involved in attraction, not reproduction.

Final answer: A