Eggs liberated from ovary in human are in
(a) Secondary oocyte stage
(b) Primary oocyte stage
(c) Oogonial stage
(d) Mature ovum stage

Options

A. Secondary oocyte stage
B. Primary oocyte stage
C. Oogonial stage
D. Mature ovum stage

Answer

To determine the stage of eggs liberated from the ovary in humans, we can analyze the process of oogenesis and the stages of egg development. Here’s a step-by-step solution:

### Step 1: Understanding Oogenesis
Oogenesis is the process by which the female gametes (eggs) are produced in the ovaries. It begins with primordial germ cells that develop into oogonia.

**Hint:** Oogenesis is the process of egg formation in females.

### Step 2: Formation of Primary Oocyte
The oogonia undergo mitosis to form primary oocytes. Each primary oocyte is diploid (2n) and is arrested in prophase I of meiosis until puberty.

**Hint:** Primary oocytes are formed from oogonia and are diploid.

### Step 3: Meiosis and Secondary Oocyte
At puberty, during the menstrual cycle, a primary oocyte completes meiosis I and divides to form a secondary oocyte and a first polar body. The secondary oocyte is haploid (n) and is the cell that is released during ovulation.

**Hint:** The secondary oocyte is formed after the first meiotic division.

### Step 4: Ovulation Process
During ovulation, the follicle containing the secondary oocyte ruptures and releases the secondary oocyte into the fallopian tube. This is the stage at which the egg is liberated from the ovary.

**Hint:** Ovulation releases the secondary oocyte, not the primary oocyte or any earlier stage.

### Step 5: Conclusion
Based on the above steps, the eggs liberated from the ovary in humans are in the secondary oocyte stage.

**Final Answer:** (a) Secondary oocyte stage