Which of the following cell type is capable of giving rise to other cell types in sponges ?
Thesocytes
Pinacocytes
Cnidocytes
Archaeocytes
D.
Archaeocytes
Archaeocytes are the totipotent cells, which provide great regenerating power to sponges. Sex cells such as sperm and ova cells arise from undifferentiated archaeocytes.
Thesocytes store food granules.
Pinacocytes are the polygonal flat cells present as outer layer of cells, called pinacoderm lining the spongocoel or body cavity in Leucosolenia.
Cnidocytes occur in entire epidermis except that of basal disc and are found only in cnidarians. Cnidocytes are spherical or oval cells.
Malpighian tubµles are
excretory organs of insects
excretory organs of frog
respiratory organs of insects
endocrine glands of insects
Which of the following is not a character of Chordata?
Dorsal tubular nerve cord
Pharyngeal gill slits
Presence of notochord
Presence of spinal cord
The group of anamniota includes:
reptiles and birds
birds and mammals
fishes and amphibians
reptiles, and mammals
