Question

Statement I: Bilaterally symmetrical animals are efficient because of cephalisation.
Statement II: Animals having flame cells are mostly acoelomates.

• A. Both statements I and II are true
• B. Both statements I and II are false
• C. Statement I is true. But II is false
• D. Statement I is false. But II is true

Hint:

Cephalization is an evolutionary adaptation for active directional movement.
Concentrating sensory organs at the front end helps animals detect food or danger first.

Answer 1

The Correct Option is A

Step 1: Read the two statements as independent claims.
True or false pair questions are easiest to solve by checking each half fully on its own before combining them.
Step 2: Verify statement I.
Bilateral animals have a distinct front end, and cephalisation concentrates sense organs and nerve tissue there, which lets the animal detect food, mates and danger before the rest of the body arrives. That is a genuine efficiency advantage, so statement I holds.
Step 3: Verify statement II.
Flame cells are the excretory units of flatworms, and flatworms such as Planaria are indeed acoelomates, they lack a true body cavity. So statement II also holds.
Final answer: Option 1, both statements I and II are true.