Fertilization in humans is practically feasible only if:

Options

A. the ovum and sperms are transported simultaneously to ampullary - isthmic junction of the Fallopian tube
B. the ovum and sperms are transported simultaneously to ampullary - isthmic junction of the cervix
C. the sperms are transported into cervix with in 48 hrs of release of ovum in uterus
D. the sperms are transported into vagina just after the release of ovum in Fallopian tube

Explanation

To answer the question "Fertilization in humans is practically feasible only if:", we need to analyze the conditions necessary for fertilization to occur. Here’s a step-by-step solution:

### Step 1: Understand Fertilization
Fertilization is the process where a male gamete (sperm) fuses with a female gamete (ovum). For fertilization to occur, both gametes must be present at the same time and in the same location.

**Hint:** Think about what needs to happen for the sperm and ovum to meet.

### Step 2: Identify the Location of Fertilization
In humans, fertilization typically occurs in the oviduct, specifically at the ampullary-isthmic junction of the fallopian tube. This is where the sperm and ovum come together.

**Hint:** Recall where in the female reproductive system fertilization takes place.

### Step 3: Timing of Gamete Release
For successful fertilization, the sperm and ovum must be available at the same time. The ovum is released during ovulation, and sperm must be present in the reproductive tract around this time to ensure they can meet.

**Hint:** Consider the timing of ovulation and sperm viability.

### Step 4: Evaluate the Options
Now, let’s evaluate the options provided in the question:
1. The ovum and sperm are transported simultaneously to the ampullary-isthmic junction of the fallopian tube. (This is correct.)
2. The ovum and sperm are transported simultaneously to the ampullary-isthmic junction of the cervix. (This is incorrect; fertilization occurs in the fallopian tube, not the cervix.)
3. The sperm are transported into the cervix within 48 hours of the release of the ovum. (This is incorrect; timing does not guarantee fertilization.)
4. The sperm are transported into the vagina just after the release of the ovum. (This is also incorrect; the timing of sperm transport is not guaranteed to coincide with ovulation.)

**Hint:** Analyze each option carefully to see if it aligns with the biological processes involved in fertilization.

### Step 5: Conclusion
The only correct statement is that fertilization is practically feasible only if the ovum and sperm are transported simultaneously to the ampullary-isthmic junction of the fallopian tube.

**Final Answer:** Fertilization in humans is practically feasible only if the ovum and sperm are transported simultaneously to the ampullary-isthmic junction of the fallopian tube.