SSC MTS EXAM

SSC

BIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
When a snails shell is tapped it retreats into it. The more you tap the shell the longer it takes to retreat and eventually it stops altogether, why is this an advantage to the snail?
A
Gives them exercise.
B
Saves energy once they have learnt their is no danger
C
They don’t like being in their shell
D
its random
Explanation: 

Detailed explanation-1: -Warning. Never pick up a snail by its shell, as this can damage the muscle that attaches the body to the shell. If this muscle, called the mantle, is damaged, death can result.

Detailed explanation-2: -Snails are invertebrates, which means they do not have a backbone. These animals move around on a single muscly “foot” and carry their home (shell) on their backs. They retreat inside their shells at the first sign of danger.

There is 1 question to complete.