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Zoology Question 56 – AP-EAMCET 2025

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The last part of the proctodaeum of cockroach is

Recall the major divisions of the alimentary canal in a cockroach.

Step 1: Understand the Alimentary Canal Divisions✦ Active

The alimentary canal of a cockroach is divided into three main regions: the foregut (stomodaeum), midgut (mesenteron), and hindgut (proctodaeum). Each region has specialized structures for digestion and absorption.

💡 Teacher's Secret Hint

It's crucial to remember the specific names for each section (foregut, midgut, hindgut) and their alternative scientific terms (stomodaeum, mesenteron, proctodaeum) as they are often used interchangeably in questions.

Step 2: Focus on the Proctodaeum (Hindgut)○ Expand

The question specifically asks about the proctodaeum. The proctodaeum is responsible for water reabsorption and formation of fecal pellets. It is further subdivided into three distinct parts.

Step 3: Identify the Parts of the Proctodaeum○ Expand

The proctodaeum consists of the ileum, followed by the colon, and finally the rectum. These parts are arranged sequentially.

Proctodaeum (Hindgut)=Ileum→Colon→Rectum
Step 4: Determine the Last Part○ Expand

Based on the sequence of parts in the proctodaeum (ileum, colon, rectum), the rectum is the terminal or last part.

💡 Teacher's Secret Hint

Pay close attention to keywords like "last part" or "terminal part" in the question to correctly identify the required segment.

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