1. Non - chordates are characterised by all the following except
1) Ventral nerve cord
2) Absence of Pharyngeal gill slits
3) Ventral heart
4) Absence of post- anal tail Answer only if you know the answer
Answers
Answer:
They are cylindrical, triploblastic, coelomate, or pseudocoelomate animals. Respiration in these animals takes place through gills, trachea or body surface. Most of the times, sexes cannot be distinguished among the members.
Answer: Option 3) Ventral heart
Explanation:
Non - chordates are triploblastic, coelomate or pseudocoelomate animals and are cylindrical. They respire through body surface, trachea and gills. Male and female sex are difficult to distinguish in case of non chordates. In case of non chordates , notochord is absent. Notochord is present in Chordates.
Characteristic features of non chordates are:
- Ventral nerve cord
- Absence of Pharyngeal gill slits
- Dorsal heart
- Absence of post- anal tail
- Notochord absent
In non - chordates , heart is present on the dorsal side of the body. In case of chordates, it is present on the ventral side.
Therefore, Non - chordates are characterised by ventral nerve cord, absence of Pharyngeal gill slits and absence of post- anal tail except one character, i.e., Ventral heart.
Thus, option 3 is correct.
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