Question

Identify an animal from phylum Mollusca which can perform three types of locomotion like swimming, creeping and walking.
A. bivalve
B. snail
C. pearl
D. octopus

Answer 1

Hint: Generally if we read carefully then the question also give a hint that is the organism also belongs to phylum Mollusca .so that we directly think about all example that is of this phylum, as all are water living so they can swim or creep but for walking arm is needed i.e camouflage of this phylum.

Complete answer:
We saw all examples are given from this phylum,
We come to all example given in the question,
Bivale- it is marine and freshwater molluscs, which having pelecypods
Which helps in creeping and swimming.
Snail (Pila)- it is covered by a hard shell and also having pseudopodia which help in swimming and creeping
Pearl (Pinctada)- i.e oyster having a strong inner shell layer composed of nacre, also known as the mother of pearl. They can swim and creep.
Octopus (devilfish) -in this organism shell is absent but to move it has a special feature i.e having 8 arms which help in swimming, creeping and also walking.
Hence from the above example and its respective characters, we conclude that the all following activity is present in octopus which is also called devil fish as per the common name.
So, the correct answer is “Option D”.

Additional Information:
All animals belonging to this phylum are marine/freshwater living to have a hardcover sheath called shell. They are coelomate and triploblastic.
It is the second-largest phylum of the animal kingdom.

Note:
We can solve this question only from a key point i.e ARM, in which organism or animal having arms they can walk, creep because it balances the body weight and helps to stand, further to walk, so it is easy because above all given option only octopus having arms only.