Development Of Male And Female Gametophyte

This question requires matching items from List A (parts of a flower) with List B (their corresponding structures or roles in the gynoecium, the female reproductive part of a flower). The gynoecium typically consists of the stigma, style, and ovary, with associated structures like the placenta. Let’s analyze each item in List A and find the correct matches step by step. - A) Stigma The stigma is the uppermost part of the gynoecium, where pollen grains land during pollination. It is often sticky or feathery to capture pollen effectively. The stigma is located at the tip of the style, which is the elongated structure connecting the stigma to the ovary. In List B, "Tip of the style" (II) directly refers to the stigma, as it describes its position at the end of the style. Therefore, Stigma matches with Tip of the style (List B: II). Match: A II. - B) Seat of ovules The "seat of ovules" refers to the structure within the ovary where the ovules (which develop into seeds after fertilization) are attached. In a flower, the ovules are borne on a specialized tissue called the placenta, which is located inside the ovary. The placenta provides nutrients to the developing ovules and is the point of attachment for them. In List B, Placenta (III) is the structure that serves as the seat of ovules. Therefore, Seat of ovules matches with Placenta (List B: III). Match: B III. - C) Basal part of Gynoecium The gynoecium is the female reproductive part of a flower, consisting of one or more carpels. Each carpel typically includes an ovary, style, and stigma. The "basal part of the gynoecium" refers to the lowermost part of this structure, which is the ovary. The ovary encloses the ovules and, after fertilization, develops into the fruit. In List B, Ovary (IV) directly corresponds to the basal part of the gynoecium. Therefore, Basal part of Gynoecium matches with Ovary (List B: IV). Match: C IV. - D) Elongated tube The "elongated tube" in the context of the gynoecium refers to the structure that connects the stigma to the ovary. This is the style, a slender, tube-like structure that elevates the stigma above the ovary, allowing pollen tubes to grow down from the stigma to the ovules in the ovary during fertilization. In List B, Style (I) is the elongated tube of the gynoecium. Therefore, Elongated tube matches with Style (List B: I). Match: D I. Now, let’s summarize the matches: - A) Stigma → Tip of the style (II) - B) Seat of ovules → Placenta (III) - C) Basal part of Gynoecium → Ovary (IV) - D) Elongated tube → Style (I) This gives us: A II, B III, C IV, D I. Let’s evaluate the options: - Option 1: A IV, B III, C IV, D II A (Stigma) is not Ovary (IV); it should be Tip of the style (II). B (Seat of ovules) matches Placenta (III), which is correct. C (Basal part of Gynoecium) matches Ovary (IV), which is correct. D (Elongated tube) is not Tip of the style (II); it should be Style (I). This option is incorrect. - Option 2: A IV, B II, C III, D I A (Stigma) is not Ovary (IV). B (Seat of ovules) is not Tip of the style (II). C (Basal part of Gynoecium) is not Placenta (III). D (Elongated tube) matches Style (I), which is correct. This option is incorrect. - Option 3: A IV, B IV, C III, D I A (Stigma) is not Ovary (IV). B (Seat of ovules) is not Ovary (IV). C (Basal part of Gynoecium) is not Placenta (III). D (Elongated tube) matches Style (I), which is correct. This option is incorrect. - Option 4: A II, B III, C IV, D I A (Stigma) matches Tip of the style (II). B (Seat of ovules) matches Placenta (III). C (Basal part of Gynoecium) matches Ovary (IV). D (Elongated tube) matches Style (I). This option is correct. Therefore, the correct answer is (4) A II, B III, C IV, D I, which corresponds to the matches we determined. Thus, the correct answer is A II, B III, C IV, D I.