Pollen Tube Discharge in Angiosperm Reproduction

Steps:

• Pollen grain germinates on stigma, forming pollen tube.
• Pollen tube grows down through style into ovary.
• Pollen tube enters ovule via micropyle.
• Male gametes exit tube inside ovule for fertilization.

Why B is correct:

• In angiosperms, pollen tube penetrates ovule, then releases two male gametes: one fuses with egg (syngamy), other with central cell (triple fusion).

Why the others are wrong:

• A. Ovary: Pollen tube enters ovary first, but gametes release only after ovule entry.
• C. Stigma: Pollen tube originates here; no gamete release occurs.
• D. Style: Pollen tube traverses style en route to ovule; discharge happens later.

Final answer: B