Question

The largest nematoblast is
 A. Stenotele
B. Desmoneme
C. Small glutinant
D. Large glutinant

Answer 1

Hint: Nematoblast is found in cnidaria which possess stinging features, which is used to capture the prey and eject poison into the prey. Cnidaria are aquatic in nature, they are found in both fresh and marine environments, they sting animals like jellyfish, sea anemones.

Complete answer:
Stenotele is the type of stinging nematocyst which is a spirally coiled thread with spiral row that is present at distal end with an operculum, this stenotele is the largest nematoblast which possesses poison.
B. Desmoneme :- it carries the blind thread that has a long coiled tube wrap around the projecting part of the prey, it is also a kind of nematocyst, when it becomes mature then it moves toward the tentacle which helps in capturing and holding the prey.
C. Small glutinant :- glutinant is called a ptychocyst and it acts as a sticky surface used to stick to prey. Small glutinant are the small spine which are present on the shaft of nematocyst which help in capture the prey by attaching to it
D. Large glutinanat :- it is also kind of spines which are present on the shaft of the nematocyst, they are usually larger in size as compare to small glutinant and function as same small glutinant, they stick to the prey and to hold the prey and capturing it.

So, the correct answer is option A.

Note: Nematoblast is the stinging organ of the cnidarians which possess poison, to catch the prey by ejecting the stenotele which is the largest portion of nematoblast, stenotele penetrate into the skin of prey where poison is ejected make the prey unable to move.