Before You Begin
Question #113422
The Question
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Although Arthropods represent a more diverse and complex evolutionary grade than Annelids, insects possess an open circulatory system whereas earthworms possess a closed circulatory system. Reason (R): The evolution of a highly branched tracheal system in insects decoupled gas transport from circulation, satisfying their high metabolic demands without requiring a closed vascular network.
In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- A.
Both (A) and (R) are correct and (R) is the correct explanation of (A)
- B.
Both (A) and (R) are correct but (R) is not the correct explanation of (A)
- C.
(A) is correct but (R) is not correct
- D.
(A) is not correct but (R) is correct
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Comparative_Analysis
Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.
Concepts Behind This Question
Earthworm Circulatory Closed System|Arthropoda Respiratory Diversity|Level of Organization
Why This Question Is Tricky
Examiner Levers
Logical Assertion
Tests the causal relationship between two true statements.
Difficulty Boost : +4Common Mistakes
Conceptual Pivot: The teleological fallacy that 'higher' phyla must possess 'closed' circulatory systems.
Students often assume evolutionary advancement strictly correlates with closed circulation.
They fail to synthesize that the insect's tracheal system directly delivers oxygen to tissues, bypassing the circulatory system entirely and allowing an open system to suffice despite high metabolic demands.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Level of Organization vs. Germ Layers |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |