alleryAnimals that form tissues but no organs, such as those of phylum Cnidaria, show which grade of body organization?
ATissue-organ grade
BCellular grade
CCell-tissue grade
DOrgan-system grade
Answer & Solution
Correct answer: C. Cell-tissue grade
1. Cnidarians have cells that come together as tissues to carry out functions.
2. They do not build complete organs, so this is the cell-tissue grade.
3. Rule out cellular grade: there no tissues form at all (e.g. Porifera).
4. Tissue-organ and organ-system grades involve organs, which cnidarians lack.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 6 "Animal Classification", p.73_
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