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Animal Kingdom — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYAnimal Kingdom5 Marks
Question
Write five differences between chordata and nonchordate.
✓

Answer

 
Chordates
Non-chordates
1.
They have a notochord.
They never have a notochord.
2.
Central nervous system includes a single, dorsal, hollow, nerve cord.
Central nervous system includes a double, ventral and solid nerve cord.
3.
Heart is ventral; haemoglobin is present in erythrocytes (cells).
Heart is dorsal; haemoglobin is dissolved in the plasma and not in cells.
4.
Pharynx is perforated by gill slits.
Gill slits are absent.
5.
A post-anal tail is present at some stage of the life.
A post-anal tail is absent.

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