At the time of birth , ovum arrested is the form of :-

Options

A. Oogonia
B. Primary oocyte
C. Secondary oocytes
D. Egg

Answer

To answer the question "At the time of birth, ovum is arrested in the form of:", we need to understand the process of oogenesis in females. Here’s a step-by-step explanation:

### Step 1: Understand Oogenesis
Oogenesis is the process of formation of ova (eggs) in females. It begins with the formation of oogonia, which are the initial germ cells.

**Hint:** Oogonia are the precursor cells in the formation of eggs.

### Step 2: Formation of Primary Oocytes
Oogonia undergo mitosis to increase in number and then differentiate into primary oocytes. This transition marks the first major step in oogenesis.

**Hint:** Remember that primary oocytes are formed from oogonia through mitosis.

### Step 3: Arrest at Prophase I
At the time of birth, primary oocytes do not complete meiosis. Instead, they enter a resting phase and are arrested in prophase I of meiosis. This is a critical point as it indicates that the primary oocytes are not yet mature eggs.

**Hint:** Primary oocytes are arrested in prophase I until puberty.

### Step 4: Role of Puberty
After puberty, under the influence of reproductive hormones, the primary oocytes can resume meiosis and progress to form secondary oocytes and eventually mature eggs.

**Hint:** The process of maturation resumes only after the onset of puberty.

### Conclusion
Based on the understanding of oogenesis, at the time of birth, the ovum is arrested in the form of **primary oocytes**.

**Final Answer:** Primary oocytes