Question

In which of the following type of nematoblast thread tube is unarmed and open at the tip?

• A. Penetrant
• B. Volvent
• C. Small glutinant
• D. Large glutinant

Answer 1

The correct option is C Small glutinant

Penetrants $-$ These is of 2 $-$ types $-$ stenotele found in Hydra and

evryteles found in jellyfish. These are the largest type of

nematocysts and is about 16 micron in diameter and is also

the most complex nematcyst. It is Per-shaped and its

thread tube is long and hollow,coiled transversely believing

3 layer stylets and 3. rows of small spines at its stoat

base. The thread tube opens at coper and discharges, it

dest out such an explosive force that it pierces the body of

prey and injects the hypnotoxin that paralyzes the prey.

Volvents $-$ These are small about 9 microns and ped-shaped

nematocysts. when discharged, the thread tube tightly coils

around small hair type projections of prey and hold it in

place

Small Glutinants $-$ These are also know as stereo line glutinant.

They are small oval or elongated glutinants that do not

posses spine and butt. They discharge straight and

unarmed thread tube open at the tip.

large Glutinants $-$ These are also known as streptoline Glotinants. They

we oval or cylindrical in shape but the thread tube

is long with norrow bolt. The thread tube is pointed

and opens at the tip and bales a spird row of

small spines

Hence small Glutinant is the type of nematoblast which thread tube

that is unarmed and opens at the tip.