Question:
Statement I: Bilaterally symmetrical animals are efficient because of cephalisation.
Statement II: Animals having flame cells are mostly acoelomates.
Statement I: Bilaterally symmetrical animals are efficient because of cephalisation.
Statement II: Animals having flame cells are mostly acoelomates.
Statement II: Animals having flame cells are mostly acoelomates.
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Cephalization is an evolutionary adaptation for active directional movement.
Concentrating sensory organs at the front end helps animals detect food or danger first.
Concentrating sensory organs at the front end helps animals detect food or danger first.
Updated On: Jul 22, 2026
- Both statements I and II are true
- Both statements I and II are false
- Statement I is true. But II is false
- Statement I is false. But II is true
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Question:
The question consists of two statements regarding animal body symmetry, cephalization, and excretory systems. We need to determine the validity of both statements.
Step 2: Key Concepts and Approach:
We evaluate the evolutionary advantages of bilateral symmetry and cephalization.
We then look at the body cavity structure of animals that possess flame cells (Platyhelminthes).
Step 3: Detailed Explanation:
• Statement I: Bilateral symmetry allows animals to divide their bodies into distinct left and right halves.
This body plan is closely linked to cephalization, which concentrates sensory organs and nervous tissues at the anterior (head) end.
Cephalization allows animals to sense and respond to their environment more efficiently as they move forward. Thus, Statement I is true.
• Statement II: Flame cells (protonephridia) are specialized excretory and osmoregulatory cells.
They are characteristic of Platyhelminthes (flatworms).
Flatworms are triploblastic but lack a fluid-filled body cavity (coelom) between the gut and body wall.
Instead, this space is filled with parenchyma tissue. Thus, flatworms are acoelomate, making Statement II true.
Step 4: Final Answer:
Both Statement I and Statement II are biologically correct.
The question consists of two statements regarding animal body symmetry, cephalization, and excretory systems. We need to determine the validity of both statements.
Step 2: Key Concepts and Approach:
We evaluate the evolutionary advantages of bilateral symmetry and cephalization.
We then look at the body cavity structure of animals that possess flame cells (Platyhelminthes).
Step 3: Detailed Explanation:
• Statement I: Bilateral symmetry allows animals to divide their bodies into distinct left and right halves.
This body plan is closely linked to cephalization, which concentrates sensory organs and nervous tissues at the anterior (head) end.
Cephalization allows animals to sense and respond to their environment more efficiently as they move forward. Thus, Statement I is true.
• Statement II: Flame cells (protonephridia) are specialized excretory and osmoregulatory cells.
They are characteristic of Platyhelminthes (flatworms).
Flatworms are triploblastic but lack a fluid-filled body cavity (coelom) between the gut and body wall.
Instead, this space is filled with parenchyma tissue. Thus, flatworms are acoelomate, making Statement II true.
Step 4: Final Answer:
Both Statement I and Statement II are biologically correct.
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