The Question is from neet-botany plant-growth-and-development , and it was created by the author NISHANTH

Question

Which of the following extra-embryonic membranes in amniotes primarily functions in waste storage?

NISHANTH · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Extra-embryonic membranes in amniotes
 **Related Topics**: Embryonic development, amniotic egg, vertebrate evolution
 **Prerequisites**: Understanding of the functions of the chorion, amnion, yolk sac, and allantois.
## SOLUTION PATHWAY
**Given Information**:
The question asks about the primary function of extra-embryonic membranes in waste storage.
**Method & Steps**:
1. **Identify the functions of each membrane:**
  Reasoning: Each extra-embryonic membrane has a specific role in supporting the developing embryo.
  
2. **Determine the waste storage function:**
  Working:  The chorion primarily facilitates gas exchange. The amnion protects the embryo in a fluid-filled sac. The yolk sac provides nutrients. The allantois is responsible for waste storage and gas exchange in many amniotes.
  Key Point:  While the chorion can participate in gas exchange which indirectly relates to waste removal, the allantois is the primary structure dedicated to waste storage.
3. **Select the correct option:**
  Result: The allantois is the extra-embryonic membrane primarily responsible for waste storage in amniotes.
  Verification: This aligns with established embryological knowledge.
 ## OPTION ANALYSIS
A :x: The chorion's main function is gas exchange.
B :x: The amnion protects the embryo with amniotic fluid.
C :x: The yolk sac provides nutrients to the developing embryo.
D ✓: The allantois functions primarily in waste storage and gas exchange. In reptiles and birds, it's involved in calcium transport as well.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the functions of the different extra-embryonic membranes:  Careful study of each membrane's role is crucial. Use mnemonics or diagrams to remember their functions.
  2.Focusing on secondary functions: Some membranes have multiple roles, but it is important to identify the primary function asked for in the question.
 **Quick Tips**:
  1.Use a mnemonic device to remember the functions (e.g.,  CAY-A for Chorion-gas exchange, Amnion-protection, Yolk sac-nutrition, Allantois-waste/gas exchange).
  2.Draw a diagram of an amniotic egg, labeling each membrane and its function.

NISHANTH · Answer

Chorion

NISHANTH · Answer

Amnion

NISHANTH · Answer

Yolk sac

NISHANTH · Answer

The correct Option is "Allantois"

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