Question

Tissue grade type of organization originated from
A)Protozoa
B)Porifera
C)Cnidarians
D)Platyhelminthes

Answer 1

Hint: The tissue level of organization is known to comprise a group of cells that work together to carry out one or more specific functions. Tissues are made from cells and in turn they combine to form organs.

Complete answer:
Among the given options in the question each group comprises organisms that have defined characteristics which are different from one another and tissue grade of organization is known to have originated from Cnidarians. Protozoa consists of single celled eukaryotic organisms which may be either parasitic or free living. The free living one are commonly found in fresh and salt water as well as moist environments whereas the parasitic ones live on or within different hosts.

Porifera comprises organisms whose entire body comprises pores and channels through which water can circulate through them. Poriferans comprises unspecialized cells that help them transform into other types. Cnidarians are aquatic animals which are found in both marine and freshwater environments. They consist of cnidocytes which are specialised cells used for capturing prey. Their bodies contain jelly like mesoglea sandwiched between two layers of epithelial cells. Platyhelminthes consist of bilaterally symmetrical, unsegmented and soft bodied invertebrates. They consist of only one opening for ingestion as well as egestion.

Hence, the correct answer is option (C)

Note: Tissue grade of organization is important since they help in carrying out specific functions accurately. They also lead to formation of organs and organ systems that further make specialised functioning easier.