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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.
The mantle in molluscs is a soft and spongy layer of skin that forms over which part of the body?
The NCERT text states, 'A soft and spongy layer of skin forms a mantle over the visceral hump.'
Molluscs are primarily:
The NCERT text mentions, 'Molluscs are terrestrial or aquatic (marine or fresh water) having an organ-system level of organisation.'
Which of the following statements about Phylum Mollusca is incorrect?
While the Arthropods have a chitinous exoskeleton, the NCERT text states that molluscs have a body 'covered by a calcareous shell'. The general summary also mentions 'The molluscs have a soft body surrounded by an external calcareous shell. The body is covered with external skeleton made of chitin.' However, this last sentence in the summary is contradictory to the detailed description of mollusca later in the text and more characteristic of arthropods. Based on the detailed description of Mollusca, the covering is a calcareous shell, not a chitinous exoskeleton. The chitinous exoskeleton is explicitly mentioned for Arthropoda.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.