The level of organisation in the phylum Platyhelminthes is
A. cellular level of organisation
B. tissue level of organisation
C. tissue-organ level of organisation
D. organ system level of organisation
B. tissue level of organisation
The level of organization in the phylum Platyhelminthes is B. tissue level of organization.
The phylum Platyhelminthes includes flatworms, such as tapeworms and planarians. To determine the level of organization in this phylum, we need to understand the different levels of organization in living organisms.
A. Cellular level of organization: This level of organization is characterized by single cells that carry out all essential life functions. However, in the case of Platyhelminthes, they are multicellular organisms, which excludes the cellular level of organization.
B. Tissue level of organization: At this level, cells with similar functions group together to form tissues. In Platyhelminthes, there is indeed a division of labor where different types of tissues perform specific functions. Therefore, this could be the correct answer.
C. Tissue-organ level of organization: This level combines the idea of tissues and organs. Organs are composed of different tissues working together to perform a specific function. While there are some specialized organs in Platyhelminthes, they are not as complex as in higher organisms. Therefore, this level may not accurately describe the organization in Platyhelminthes.
D. Organ system level of organization: This level involves multiple organs working together to form systems that perform specific functions. In Platyhelminthes, there is no clear differentiation of organ systems. Therefore, this level does not fit with the organization in Platyhelminthes.
Based on the options presented, B. tissue level of organization is the most appropriate choice for the level of organization in the phylum Platyhelminthes.