Question

9. Find the odd one from each group. Justify your answer.
a) Star fish, Devil fish, Dog fish, Jelly hish b)Flying fish, Angel fish, Saw fish, Fighting fish
c) sca lily, Sea cucumber, Sea hare, Sea urchin​

Answer 1

Answer:

jelly fish

Explanation:

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Answer 2

We will classify each organism in each group one-by-one:

(a)  

1. Star Fish : Echinodermata (Asterias)
2. Devil Fish : Pisces (Chordata)
3. Dog Fish : Pisces ( Scoliodon)
4. Jelly Fish : Cnidaria (Aurelia)

Therefore, Star Fish and Jelly Fish are odd one out.

(b)

1. Flying Fish: Osteichthyes (Exocoetus) (bony fish)
2. Angel fish : Osteichthyes ( Pterophyllum)
3. Saw Fish : Chondrichthyes ( Pristis)
4. Fighting Fish : Osteichthyes ( Betta)

Therefore, Saw Fish is the odd one out.

(c)

1. Sea Lilly : Echninodermata (Antedon)
2. Sea Cucumber : Echinodermata (Cucumaria)
3. Sea Hare : Mollusca (Aplysia)
4. Sea Urchin : Echinodermata (Echinus)

Therefore, Sea Hare is the odd one out.

Hence in (a) Star Fish and Jelly Fish are odd, in (b) Saw Fish is odd and in (c) Sea Hare is odd.