The Question is from neet-zoology animal-kingdom hemichordata, and it was created by the author T HARITHA

Question

The unique excretory organ found in members of Hemichordata, specifically Enteropneusta, which filters nitrogenous waste from the blood, is called the:

T HARITHA · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
	**Primary Concept**: Excretion in Hemichordata
	**Related Topics**: Invertebrate Zoology, Osmoregulation, Phylogeny
	**Prerequisites**: Basic understanding of excretory systems in animals.
## SOLUTION PATHWAY
**Given Information**:
	The question asks about the specific excretory organ in Hemichordata (Enteropneusta) that filters nitrogenous waste from the blood.
**Method & Steps**:
	1. Recall the excretory system in Hemichordata.
		Reasoning: Hemichordates, specifically the acorn worms (Enteropneusta), possess a unique excretory structure.
	2. Identify the 'glomerulus' as the specialized excretory structure in Enteropneusta.
		Working:  The glomerulus in hemichordates is a network of blood vessels associated with the proboscis coelom (protocoel) that filters waste from the blood.
		Key Point: While the term 'glomerulus' is also used in vertebrate kidneys, the hemichordate glomerulus is structurally and functionally different.
	3. Eliminate other options based on their presence in other organisms.
		Result: Glomerulus is the correct answer.
		Verification:  Nephridia, Malpighian tubules, and flame cells are excretory structures found in other invertebrate groups, not hemichordates.
## OPTION ANALYSIS
[A] ✓: The glomerulus is the correct excretory organ found in Enteropneusta, filtering nitrogenous waste from the blood.
[B] :x: Nephridia are excretory organs found in annelids and some other invertebrates, but not in Hemichordata.
[C] :x: Malpighian tubules are the excretory organs of insects and other arthropods.
[D] :x: Flame cells (protonephridia) are the excretory structures found in flatworms (Platyhelminthes) and some other invertebrates.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing the hemichordate glomerulus with the vertebrate glomerulus: Although they share the same name, their structure and evolutionary origins are different.
		2.  Attributing other invertebrate excretory organs to Hemichordata: Be sure to know the specific excretory structures of different invertebrate groups.
	**Quick Tips**:
		1. Remember 'glomerulus' as the key excretory structure for Hemichordata (Enteropneusta).
		2.  Visualize the location of the glomerulus in the proboscis region of the acorn worm.

T HARITHA · Answer

The correct Option is "glomerulus"

T HARITHA · Answer

nephridium

T HARITHA · Answer

Malpighian tubule

T HARITHA · Answer

flame cell

NEET Zoology Animal Kingdom Hemichordata MCQs

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