Practice free Classification of Animal Kingdom (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following describes the level of organization in Phylum Mollusca?
According to the NCERT text, 'Molluscs are terrestrial or aquatic (marine or fresh water) having an organ-system level of organisation.' This indicates that Phylum Mollusca exhibits an organ-system level of organization.
Identify the characteristic of Phylum Mollusca among the following options.
The NCERT text states, 'The molluscs have a soft body surrounded by an external calcareous shell.' and further, 'Body is covered by a calcareous shell and is unsegmented with a distinct head, muscular foot and visceral hump.' This clearly indicates the presence of a calcareous shell and unsegmented body as characteristics of Mollusca.
The second largest animal phylum is:
The NCERT text explicitly states, 'This is the second largest animal phylum (Figure 4.13).' in reference to Phylum Mollusca.
Which of the following structures is responsible for both respiratory and excretory functions in molluscs?
The NCERT text mentions, 'The space between the hump and the mantle is called the mantle cavity in which feather like gills are present. They have respiratory and excretory functions.' Thus, feather-like gills perform both functions.
What is the feeding organ characteristic of molluscs?
The NCERT text describes, 'The mouth contains a file-like rasping organ for feeding, called radula.'
Which of the following organisms is an example of Phylum Mollusca?
The NCERT text lists 'Sepia (Cuttlefish)' as an example of Mollusca. Limulus is Arthropoda, Asterias is Echinodermata, and Balanoglossus is Hemichordata.
Molluscs are characterized by:
The NCERT text states, 'They are bilaterally symmetrical, triploblastic and coelomate animals' referring to Mollusca.
The body of molluscs is divided into distinct regions. Which of the following is NOT one of them?
The NCERT text describes the mollusc body as 'unsegmented with a distinct head, muscular foot and visceral hump.' Thorax is typically found in arthropods.
Molluscs generally exhibit what type of development?
The NCERT text mentions for Mollusca, 'They are usually dioecious and oviparous with indirect development.' The presence of larval stages is implied by indirect development.
Which of the following molluscan examples is commonly known as 'Pearl oyster'?
The NCERT text lists 'Pinctada (Pearl oyster)' as an example of Mollusca.
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