Spiny bodied animals (a) Are exclusively marine (b) Have ventral anus (c) Have radially symmetrical larva (d) Lack excretory system Which of the statements are correct?
A
All correct
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B
a & b
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C
a, c, d
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D
only a
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Solution
The correct option is B a & b Echinoderms are also called as spiny bodied animals. (Echinos: spiny, derma: skin). These animals show following characteristics:
These are exclusively marine
Grade of organization: organ system grade
Germ layer: triploblastic
Symmetry: Adults are radially symmetrical while the larvae are bilaterally symmetrical
The shape of the body is flat, star-like, spherical or elongated.
Presence of water vascular system
Mouth is present on the ventral side while anus is present on the dorsal side.
Presence of water vascular system
Few examples of echinoderms are starfish, sea urchin, sea lily, cucumaria (sea cucumber), Antedon etc.