Arrange the following organisms on the basis of different levels of
onganization.
EARTHWORM
(Organ Level)
COCKROACH
(Organ System level)
HYDRA
(Tissue Level)
SPONGE
(Cellular Level)
Answers
Answer:
Animals show four different grades of organization:
(i) Protoplasmic grade found in protozoans.
(ii) Cellular grade is the characteristic of sponges and mesozoans because in a sponge, cells exhibit division of labour for performing specialized functions.
(iii) Tissue grade is of two types : Cell-tissue grade is seen in coelenterates as there are cells not only specialised for different functions but also certain similar cells gather together to form tissue as well. Tissue - organ grade appears in flatworms (Platyhelminthes) with arrangement of tissues to form organs.
(iv) In organ system level of organisation, organs are joined in a system to perform basic functions. It is found in higher invertebrates and all vertebrates.
Hence the correct option is D.
Answer:
SPONGE
(Cellular Level)
HYDRA
(Tissue Level)
EARTHWORM
(Organ Level)
COCKROACH
(Organ System Level)