Question:
Structurally Centrale diatoms are ``X'' symmetrical and Pennales diatoms are ``Y'' symmetrical. `X' and `Y' respectively are
Structurally Centrale diatoms are ``X'' symmetrical and Pennales diatoms are ``Y'' symmetrical. `X' and `Y' respectively are
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{C}entrales = {C}ircle = {R}adial.
{P}ennales = {P}en-like/Elongated = {B}ilateral.
Updated On: Apr 7, 2026
- X - Bilateral, Y - Radial
- X - Radial, Y - Bilateral
- X - Polyhedral, Y - Radial
- X - Helical, Y - Bilateral
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The Correct Option is B
Solution and Explanation
Step 1: Classification of Diatoms:
Diatoms (Bacillariophyceae) are broadly classified into two orders based on symmetry:
Step 2: Match Variables:
X (Centrale) = Radial.
Y (Pennales) = Bilateral.
Step 3: Final Answer:
Option (B) matches this sequence.
Diatoms (Bacillariophyceae) are broadly classified into two orders based on symmetry:
- Centrales (Centric diatoms): These are circular, discoid, or cylindrical in shape. They exhibit Radial symmetry.
- Pennales (Pennate diatoms): These are elongated, boat-shaped, or needle-like (e.g., \Pinnularia, \Navicula). They exhibit Bilateral symmetry.
Step 2: Match Variables:
X (Centrale) = Radial.
Y (Pennales) = Bilateral.
Step 3: Final Answer:
Option (B) matches this sequence.
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