Questions
Which of the following structures are modified placoid scales in Trygon?
a
Electric organs
b
Teeth
c
Poison sting
d
Fins
detailed solution
Correct option is B
Teeth are modified placoid scales which are backwardly directed among Chondricthyes (e.g., Trygon). Electric organs are modified dorsal muscles. Spine is a modification of the dorsal fin.Talk to our academic expert!
Similar Questions
Match the following genera with their respective phyla.
| Column I | Column II | ||
| (a) | Adamsia | (i) | Mollusca |
| (b) | Aplysia | (ii) | Aschelminthes |
| (c) | Ascidia | (iii) | Chordata |
| (d) | Ancylostoma | (iv) | Cnidaria |
| a | b | c | d | |
| 1. | i | iv | iii | ii |
| 2. | iv | i | iii | ii |
| 3. | ii | iii | i | iv |
| 4. | iv | i | ii | iii |
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