From among the sets of terms given below, identify those that are associated with the gynoecium.

Options

A. Stigma, ovule, embryo sac, placenta
B. Thalamus , pistil, style, ovule
C. Ovule , ovary, embryo sac, tapetum
D. Ovule, stamen, ovary , embryo sac

Explanation

To identify the terms associated with the gynoecium, we need to understand what the gynoecium is and its components. The gynoecium is the female reproductive part of a flower, and it consists of one or more carpels (or pistils). Each carpel typically has three main parts: the stigma, style, and ovary. The ovary contains ovules, which develop into seeds after fertilization.

Let's analyze the options provided:

1. **Option A: Stigma, Ovule, Embryo sac, Placenta**
- **Stigma**: Part of the gynoecium where pollen lands.
- **Ovule**: Structure within the ovary that develops into a seed.
- **Embryo sac**: Contains the female gametes, found within the ovule.
- **Placenta**: Tissue that attaches the ovule to the ovary wall.
- **Conclusion**: All terms are associated with the gynoecium.

2. **Option B: Thalamus, Pistil, Style, Ovule**
- **Thalamus**: Part of the flower where all floral whorls are arranged; not part of the gynoecium.
- **Pistil**: Another term for the carpel, part of the gynoecium.
- **Style**: Part of the gynoecium that connects the stigma and ovary.
- **Ovule**: Structure within the ovary that develops into a seed.
- **Conclusion**: While pistil, style, and ovule are associated with the gynoecium, thalamus is not.

3. **Option C: Ovule, Ovary, Embryo sac, Tapetum**
- **Ovule**: Part of the gynoecium.
- **Ovary**: Part of the gynoecium that contains ovules.
- **Embryo sac**: Found within the ovule, part of the gynoecium.
- **Tapetum**: Nutritive tissue associated with the stamen, not part of the gynoecium.
- **Conclusion**: Three terms are associated with the gynoecium, but tapetum is not.

4. **Option D: Ovule, Stem, Ovary, Embryo sac**
- **Ovule**: Part of the gynoecium.
- **Stem**: Part of the plant, not associated with the gynoecium.
- **Ovary**: Part of the gynoecium.
- **Embryo sac**: Part of the gynoecium.
- **Conclusion**: Two terms are associated with the gynoecium, but stem is not.

After evaluating all options, the only set of terms that are entirely associated with the gynoecium is **Option A: Stigma, Ovule, Embryo sac, Placenta**.

### Final Answer:
**Option A: Stigma, Ovule, Embryo sac, Placenta**

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