Animal Kingdom Question 734
Hydra recognises its prey by chemical cues
[BVP 2001; MH CET 2003]
Options:
A) Nematocyst
B) Chemical stimulus
C) Olfaction
D) Sensitivity is the ability of a system to detect a stimulus.
Show Answer
Answer:
Correct Answer: A
Solution:
In Hydra, there are nematocysts which are minute, elongated or spherical capsules. Several capsules occur on the body surface.
Each is produced by a special cell called a cnidoblast and contains a coiled, hollow, usually barbed thread, which quickly turns outward from the capsule upon proper stimulation.
The purpose of the thread is to ward off enemies or to capture prey. The thread contains venom which helps to capture the prey.
Thus, the correct answer is option A.
BETA
