alleryWhich grade of organization is shown by animals of phylum Porifera?
AOrgan-system grade
BCell-tissue grade
CTissue-organ grade
DCellular grade
Answer & Solution
Correct answer: D. Cellular grade
1. In Porifera, cells do not group into tissues.
2. This level is the cellular grade of organization.
3. Rule out cell-tissue grade: that requires tissues to form, as in Cnidaria.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 6 "Animal Classification", p.73_
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