O Levels Biology (5090)•5090/12/O/N/20

Explanation
Flower Structures Producing Gametes Steps:
- Identify haploid gametes as sex cells from meiosis: male (sperm) and female (egg).
- Locate male gamete production in the anther, where microspores form pollen grains.
- Locate female gamete production in the ovule, where megaspores form the embryo sac.
- Match to diagram labels: anther as 2, ovule as 4.
Why C is correct:
- Anther (2) undergoes meiosis to produce haploid pollen (male gametes); ovule (4) undergoes meiosis to produce haploid embryo sac (female gametes).
Why the others are wrong:
- A: Filament (1) supports anther but produces no gametes; anther (2) does.
- B: Filament (1) and style (3) aid pollen tube growth but do not produce gametes.
- D: Style (3) guides pollen; ovule (4) produces gametes, but style does not.
Final answer: C
Topic: Sexual reproduction in plants
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