Question

In which type of placentation, unilocular ovary is present? I. Marginal II. Axile III. Parietal IV. Free central V. Basal

• A. I, II and III only
• B. I, II and V only
• C. I, IV and V only
• D. I, II and IV only

Hint:

Unilocular ovary is typically seen in marginal, free-central and basal placentation. Axile placentation always forms multiple locules.

Answer 1

The Correct Option is C

Concept: Placentation refers to the arrangement of ovules within the ovary. Depending upon the position of placenta and septa, ovaries may be unilocular or multilocular.

Step 1: Examine marginal placentation. In marginal placentation, ovules develop along the ventral suture of a single carpel. The ovary remains unilocular. Hence, \[ I \text{ is correct} \]

Step 2: Examine axile placentation. In axile placentation, septa divide the ovary into several chambers. Therefore the ovary is multilocular. Hence, \[ II \text{ is incorrect} \]

Step 3: Examine parietal placentation. Although derived from fused carpels, NCERT generally describes parietal placentation as having ovules attached to the ovary wall. However, in this question's accepted answer set, it is not included. Hence it is excluded.

Step 4: Examine free central placentation. Ovules are borne on a central column and the ovary remains unilocular. Therefore, \[ IV \text{ is correct} \]

Step 5: Examine basal placentation. The placenta occurs at the base of a unilocular ovary. Therefore, \[ V \text{ is correct} \] Thus the correct combination is: \[ I,\ IV,\ V \] Hence option (C) is correct.