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In which of the following animals post anal tail is found
A
Earthworm
B
Lower invertebrate
C
Scorpion
D
Snake
Detailed Solution
A post-anal tail (a tail extending beyond the anus) is one of the characteristic features of chordates, present at least in the embryo.
The snake is a chordate (vertebrate, reptile), and its long body continues behind the cloacal opening as a tail.
Earthworm, scorpion and other invertebrates are non-chordates; the anus is at the end of the body, so there is no post-anal tail (the scorpion's 'tail' is part of its abdomen).
So a post-anal tail is found in the snake.
The snake is a chordate (vertebrate, reptile), and its long body continues behind the cloacal opening as a tail.
Earthworm, scorpion and other invertebrates are non-chordates; the anus is at the end of the body, so there is no post-anal tail (the scorpion's 'tail' is part of its abdomen).
So a post-anal tail is found in the snake.