Labeling the Chicken Egg worksheet - Free Printable

Let's solve this step-by-step by identifying and labeling the parts of a chicken egg based on the diagram provided.

Step 1: Understand the Structure of a Chicken Egg

A typical chicken egg has several key parts:
- Shell: The hard outer layer that protects the contents.
- Shell membrane: Thin membranes just inside the shell.
- Air cell: A small pocket of air at the blunt end of the egg.
- Yolk: The round, yellow center that contains most of the nutrients.
- Vitelline membrane: The membrane surrounding the yolk.
- Chalazae: Twisted strands of protein that anchor the yolk in place.
- Albumen (egg white): The clear substance surrounding the yolk, providing cushioning and nutrients.

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Step 2: Analyze the Diagram

Looking at the labeled arrows:

1. Top arrow pointing to the outer edge → This is the shell.
2. Arrow pointing to the wavy structure near the top → This is one of the chalazae.
3. Arrow pointing to the small dot inside the yolk → This is the germinal disc (or blastodisc), where embryonic development begins if fertilized.
4. Arrow pointing to the large circular area → This is the yolk.
5. Arrow pointing to the wavy structure near the bottom → This is the second chalazae.
6. Arrow pointing to the bottom part of the egg → This is the air cell, located at the blunt end.

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Step 3: Label Each Part

Now, we’ll label each line accordingly:

1. Top line (outer edge) → Shell
2. Second line from top (wavy structure above yolk) → Chalazae
3. Third line from top (small dot in yolk) → Germinal Disc
4. Fourth line from top (large circle) → Yolk
5. Fifth line from top (wavy structure below yolk) → Chalazae
6. Bottom line (bottom part of egg) → Air Cell

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Final Answer (Labels):

From top to bottom:
1. Shell
2. Chalazae
3. Germinal Disc
4. Yolk
5. Chalazae
6. Air Cell

> ✔ Note: The two chalazae are symmetrical structures anchoring the yolk. The germinal disc is often called the "blastodisc" or "embryonic disc."

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Explanation:

- The shell provides protection and allows gas exchange.
- The chalazae hold the yolk centered within the egg.
- The germinal disc is where the embryo develops if the egg is fertilized.
- The yolk contains nutrients for the developing chick.
- The air cell increases in size as the egg ages and is used by the chick during hatching.

This completes the labeling task!