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Mollusca and Echinodermata MCQs for Competitive Exams

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Mollusca and Echinodermata MCQs for Competitive Exams

Practice with answers, explanations, and exam-focused revision notes.

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Topic Notes: Mollusca and Echinodermata

These notes summarize the key preparation context before you attempt the MCQs. Review the topic focus, then practice the questions below with answers and explanations.

Quick Overview

Mollusca and Echinodermata MCQs in Biology are useful for candidates who need targeted practice for CSS, PMS, FPSC, PPSC, NTS, entry tests, and other competitive exams in Pakistan. This topic page is designed for quick revision, repeated practice, and exam-focused preparation.

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11
Which of the following groups contains the largest known invertebrate species?
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12
Which invertebrate phylum is recognized as having the second-highest level of species diversity?
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13
Which of the following animal groups typically possesses an open circulatory system, excluding the class Cephalopoda?
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14
What organism is identified by the scientific name 'Asterias rubens'?
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15
What is the name of the rasping, tongue-like organ equipped with horny teeth found in the mouth cavity of many molluscs?
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16
Which group of organisms is taxonomically classified as 'Prechordates'?
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17
What are the defining characteristics of cleavage in animals that exhibit spiral cleavage?
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18
Which animal phylum is characterized by bilateral symmetry in the larval stage and radial symmetry in the adult stage?
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19
What is the primary chemical composition of the exoskeleton found in marine snails?
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20
What is the total number of bones that constitute the human pelvic girdle?
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