Question

Tentacles of Hydra are
A. Hollow
B. Solid
C. Half hollow and half solid
D. none of the above

Answer 1

Hint: Hydra is a small aquatic organism that belongs to phylum cnidaria, they are found in the temperate and tropical region and they are known for regenerative ability, they do not show the aging process they reproduce asexually.

Complete answer: Tentacles of the Hydra are the extension of the body layer that encircles the opening of the mouth, the construction of Hydra is a simple body column and highly extensible tentacles, Hydra uses these tentacles for capturing or hunting the prey.
-Each tentacle of the Hydra consists of specialized stinging cells that are called cnidocytes and cnidocytes contain specialized structures known as nematocysts, that appear as the tiny bulb that coiled thread inside. The outer edge of the cnidocyte possesses cnidocil which is short trigger hair. When it comes in contact with prey the nematocyst discharged darts like a thread with the neurotoxin, which can paralyze the prey.
-The body of a Hydra is hollow, and it has two body layers that make it diploblastic, the outer layer is the epidermis and the inner layer is the gastrodermis. It shows radial symmetry and the nervous system of Hydra is like the net of nerves, which is a simple nerve structure compared to other complex organisms' nervous systems. Hydra is generally sessile or sedentary but sometimes shows movement mainly in case of hunting and movement is occurring in two ways like looping and somersaulting and also shows amoeboid movement.
Hence, the correct option is A.

Note: Hydra show asexual reproduction by the budding process, the new bud arise from the body wall, slowly grow into tiny adult hydra and after some time break form the main body when it matures. When prey or food is sufficient then in every two days new bud has arisen for its body