Animal Kingdom Question 325
Question: Radial symmetry is often exhibited by animals having
[CBSE PMT 1994, 96, 97]
Options:
A) One opening of alimentary canal
B) Aquatic mode of living
C) Benthos/sedentary nature
D) Ciliary mode of feeding
Show Answer
Answer:
Correct Answer: C
Solution:
Radial symmetry is a type of symmetry wherein identical parts are arranged in a circular fashion around a central axis. Here’s a brief explanation of the options:
Option A: One opening of alimentary canal - While some radially symmetric animals like cnidarians (jellyfish, sea anemones) have one opening to their alimentary canal, this is not a defining characteristic of radial symmetry.
Option B: Aquatic mode of living - While many radially symmetric animals are aquatic, not all aquatic animals exhibit radial symmetry. Therefore, this is not a defining characteristic of radial symmetry.
Option C: Benthos/sedentary nature - This is the correct answer. Many benthic (bottom-dwelling) and sedentary (non-moving) animals, like sea anemones and starfish, exhibit radial symmetry. This type of symmetry allows them to interact with their environment from all directions.
Option D: Ciliary mode of feeding - While some radially symmetric animals use cilia for feeding, this is not a defining characteristic of radial symmetry.
BETA
