Zoology - Structural Organisation in Animals Question with Solution | TestHub
Read the following statements carefully:
(1) Gap junction facilitates the cells to communicate with each other by connecting the cytoplasm of two adjoining cells.
(2) Adhering junctions help to stop substances from leaking across a tissue.
(3) Compound epithelium covers the dry surface of the skin only and provides protection against chemical and mechanical stresses.
(4) Most of the bones in vertebrates embryos are replaced by cartilages in adults.
How many of the above statements is/are correct?
Options:
Answer:
Solution:
Gap junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells for the rapid transfer of molecules and ions. Tight junctions help to stop substances from leaking across a tissue, whereas adhering junctions perform cementing to keep neighboring cells together. Compound epithelium covers the dry surface of the skin as well as the moist surface of the buccal cavity, pharynx, and inner lining of ducts of glands. In vertebrates, most of the cartilages present in the embryonic stage are replaced by bones in adults.
