Q. Which of the following is colourless Hydra?
A) Hydra fusca
B) Hydra viridis
C) Hydra oligactis
D) Hydra vulgaris
Explanation
Hydra vulgaris is more or less colourless.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.