Column I
I. Morula
II. Polyspermy
III. Implantation
IV. Prolactin
Column II
(A) Fertilization membrane
(B) Solid ball of cells
(C) Mammary gland
(D) Endometrium

Options

A. I - B, II - A, III - D, IV - C
B. I - D, II - B, III - C, IV - A
C. I - D, II - C, III - B, IV - A
D. I - D, II - C, III - A, IV - B

Answer

To solve the question, we need to match the items in Column I with the correct items in Column II. Here’s a step-by-step solution:

### Step 1: Identify the meaning of each term in Column I
1. **Morula**: This is a solid ball of cells formed after several divisions of the fertilized egg (zygote). It typically consists of 16 to 32 cells.
2. **Polyspermy**: This refers to the condition where more than one sperm fertilizes an egg, which is typically prevented by the fertilization membrane.
3. **Implantation**: This is the process where the blastocyst (developed from the morula) attaches to the endometrium (the lining of the uterus).
4. **Prolactin**: This is a hormone that stimulates milk production in the mammary glands after childbirth.

### Step 2: Match each term with the correct option in Column II
1. **Morula** matches with **(B) Solid ball of cells**.
- Explanation: The morula is specifically described as a solid ball of cells formed during early embryonic development.

2. **Polyspermy** matches with **(A) Fertilization membrane**.
- Explanation: The fertilization membrane is a protective layer that prevents polyspermy by blocking additional sperm from entering the egg after the first sperm has fertilized it.

3. **Implantation** matches with **(D) Endometrium**.
- Explanation: Implantation occurs when the blastocyst embeds itself into the endometrium, which is the inner lining of the uterus.

4. **Prolactin** matches with **(C) Mammary gland**.
- Explanation: Prolactin is the hormone responsible for stimulating milk production in the mammary glands.

### Final Matching
- I. Morula → (B) Solid ball of cells
- II. Polyspermy → (A) Fertilization membrane
- III. Implantation → (D) Endometrium
- IV. Prolactin → (C) Mammary gland

### Summary of the Correct Matches:
1. Morula - B
2. Polyspermy - A
3. Implantation - D
4. Prolactin - C