alleryWhich of the following phyla is characterised by radial symmetry, diploblastic organisation and the presence of cnidoblasts?
ACoelenterata
BPorifera
CCtenophora
DPlatyhelminthes
Answer & Solution
Correct answer: A. Coelenterata
1. Radial symmetry appears in Coelenterata, Ctenophora and Echinodermata.
2. Diploblastic organisation with ectoderm + endoderm is exclusive to Coelenterata and Ctenophora.
3. Cnidoblasts (cnidocytes containing nematocysts) are diagnostic of Coelenterata (Cnidaria) alone.
4. Ctenophores use ciliated comb plates and lack cnidoblasts.
_Source: syllabus Biology, Ch 4 "Animal Kingdom", §4.2.2_
Keep practising Animal Kingdom
Browse all Animal Kingdom questions for AP Intermediate 1st Year, or explore more Biology topics.
Related questions
The segmentation seen in the earthworm is called:A body divided into segments with repeated organs shows:Animals with no body cavity at all are called:A cavity not lined by mesoderm is called a:Animals possessing a true coelom are called:A body cavity lined by mesoderm is called the:The mesoderm lies in the embryo between the endoderm and the:Animals whose embryo also has mesoderm are called: