True Statements About Chicken Egg Structure

Which of the following is true about the chicken egg?

Correct Answer: Embryo head forms toward the broad end because maximum pores are there

All three facts about the chicken egg are correct:

1. The embryo head forms toward the broad end because the maximum number of pores (for O₂ intake and CO₂/moisture release) are located at the broad end of the egg.
2. The air cell is located at the broad end of the egg.
3. The depth of air cell in a freshly laid egg is 1–3 mm (very small; it enlarges with age).

Since the original answer key says 'All the above,' the correct option here specifically addresses the first true statement (as stated in option a).

Egg Structure Quick Reference

• Egg weight distribution: Albumin 58%, Yolk 31%, Shell + membrane 11%
• Shell composition: 96% inorganic (CaCO₃, MgCO₃, Ca₃PO₄) + 4% organic
• Vitelline membrane: separates yolk from albumin
• Chalazae: twisted albumin strands that keep yolk centred

Air Cell Freshness Test

• Fresh egg (1–3 mm air cell) → sinks in water horizontally.
• 1-week old egg → slightly tilts in water.
• Old egg (large air cell) → floats vertically or at surface → not suitable for consumption.