Given below are two statements:
Statement I: Malpighian tubules are absent in the Collembola and aphids
Statement II: Cryptonephridial system is present in many coleopterans
In light of the above statements, choose the correct answer from the options given below:
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- Collembola & Aphids: lack Malpighian tubules entirely.
- Coleopterans: possess a cryptonephridial system to maximize water reabsorption from the rectum.
Statement I is correct but Statement II is incorrect
Statement I is incorrect but Statement II is corect
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The Correct Option isA
Solution and Explanation
Step 1: Understanding the Concept:
Excretion and water conservation in insects are mediated by the Malpighian tubules and the hindgut, which work together to regulate salt and water balance.
Understanding variations in these organ systems across different insect orders is essential to studying insect physiology. Step 2: Detailed Explanation:
Let us evaluate both statements:
- Statement I: Malpighian tubules are the primary excretory organs of most insects.
However, they are completely absent in primitive, wingless hexapods like Collembola (springtails).
They are also absent in certain fluid-feeding Hemipterans like aphids, which excrete excess water and sugars through a specialized gut system. Thus, Statement I is correct.
- Statement II: The cryptonephridial system is an anatomical modification found in many larval and adult Coleopterans (beetles), particularly those living in dry environments (e.g., Tenebrionidae).
In this system, the distal ends of the Malpighian tubules are closely associated with and embedded in the perinephric membrane surrounding the rectum.
This arrangement allows the insect to reabsorb water from the rectal contents, producing extremely dry feces. Thus, Statement II is correct.
Therefore, both Statement I and Statement II are correct. Step 3: Final Answer
The correct option is (A).
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