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How many of the given animals are chorda...

How many of the given animals are chordates with vertebra and jaws ?
Sea hare, Doliolum , Stingray, Petromyzon , Salpa, Ichthyophis , Macropus, Clarias , Branchiostoma ,chelone, Balanoglossus

A

Five

B

Six

C

Seven

D

Eight

Text Solution

AI Generated Solution

The correct Answer is:
To determine how many of the given animals are chordates with vertebrae and jaws, we will analyze each animal one by one. 1. **Sea Hare (Aplysia)**: This animal belongs to the phylum Mollusca. Mollusks do not have a vertebral column or jaws. - **Hint**: Remember that Mollusca is a different phylum from Chordata. 2. **Doliolum**: This is a type of tunicate, which also does not possess a vertebral column or jaws. - **Hint**: Tunicates are part of the subphylum Urochordata and lack vertebrae. 3. **Stingray**: Stingrays are part of the class Chondrichthyes, which have a cartilaginous skeleton, vertebrae, and jaws. - **Hint**: Chondrichthyes includes sharks and rays, which have jaws. 4. **Petromyzon (Lamprey)**: Lampreys are jawless fish belonging to the class Cyclostomata. They do not have jaws. - **Hint**: Cyclostomata includes jawless vertebrates. 5. **Salpa**: Similar to Doliolum, salps are also tunicates and do not have a vertebral column or jaws. - **Hint**: Salps are also part of the Urochordata subphylum. 6. **Ichthyophis**: This is a genus of amphibians (caecilians) that have both vertebrae and jaws. - **Hint**: Amphibians are chordates with vertebrae and jaws. 7. **Macropus (Kangaroo)**: Kangaroos are mammals and possess both vertebrae and jaws. - **Hint**: Mammals are a class of chordates with both features. 8. **Clarias (Catfish)**: Catfish belong to the class Actinopterygii (ray-finned fishes) and have vertebrae and jaws. - **Hint**: Actinopterygii includes many fish species with jaws. 9. **Branchiostoma**: This is a lancelet, which is a cephalochordate. They do not have a vertebral column or jaws. - **Hint**: Cephalochordates are primitive chordates without jaws. 10. **Chelone (Turtle)**: Turtles are reptiles and have both vertebrae and jaws. - **Hint**: Reptiles are another class of chordates with these features. 11. **Balanoglossus**: This is a hemichordate and does not have a vertebral column or jaws. - **Hint**: Hemichordates are not true chordates. Now, let's summarize which animals have both vertebrae and jaws: - Stingray - Ichthyophis - Macropus - Clarias - Chelone Counting these, we find that there are **5 animals** that are chordates with vertebrae and jaws. **Final Answer**: 5
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