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Zoology MCQs for NEET — Practice Questions with Answers

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Which of the following organelles is NOT considered part of the endomembrane system, primarily because its functions are not coordinated with the others in the system, even though it contains ribosomes?

A. Endoplasmic Reticulum B. Golgi complex C. Mitochondria D. Vacuoles

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Explanation

The NCERT states: 'Since the functions of the mitochondria, chloroplast and peroxisomes are not coordinated with the above components (ER, golgi, lysosomes, vacuoles), these are not considered as part of the endomembrane system.' Mitochondria are known to contain 70S ribosomes.

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The outer membrane of the nucleus is continuous with which organelle and also bears ribosomes on it?

A. Golgi apparatus B. Smooth endoplasmic reticulum C. Endoplasmic reticulum D. Mitochondria

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Explanation

NCERT text states: 'The outer membrane usually remains continuous with the endoplasmic reticulum and also bears ribosomes on it.'

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George Palade (1953) observed ribosomes as dense particles under the electron microscope. What characteristic of ribosomes made them stand out in his observations?

A. Their elaborate filamentous structure B. Their surrounding membrane C. Their granular and dense nature D. Their role in lipid synthesis

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Explanation

The NCERT text states: 'Ribosomes are the granular structures first observed under the electron microscope as dense particles by George Palade (1953).'

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Which of the following statements correctly describes the circulatory system in members of Phylum Hemichordata?

A. It is of the closed type, similar to Annelids. B. It is of the open type, allowing blood to flow through sinuses. C. It is absent, with nutrients and gases exchanged by diffusion. D. It is a rudimentary system, involving only a few specialized vessels.

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Explanation

According to the NCERT text, 'Circulatory system is of open type' in Hemichordata. This means that the blood flows through open spaces (sinuses) rather than being confined to blood vessels throughout its circuit.

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Respiration in Hemichordata primarily occurs through which of the following structures?

A. Book lungs B. Tracheal system C. Gills D. Malpighian tubules

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Explanation

The NCERT text states, 'Respiration takes place through gills' for Hemichordata. Options o1, o2, and o4 are characteristic respiratory/excretory structures of Arthropods.

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What is the primary excretory organ found in organisms belonging to Phylum Hemichordata?

A. Flame cells B. Metanephridia C. Proboscis gland D. Kidneys

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Explanation

The NCERT text explicitly mentions, 'Excretory organ is proboscis gland' for Hemichordata. Flame cells are found in Platyhelminthes, and metanephridia in Annelids.

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Sexes in Hemichordata are described as 'separate'. This condition is also known as:

A. Hermaphroditic B. Monoecious C. Asexual D. Dioecious

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Explanation

The term 'Sexes are separate' in biology is synonymous with dioecious, meaning male and female reproductive organs are in separate individuals. Hermaphroditic or monoecious implies both sexes are in the same individual.

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Which of the following developmental patterns is characteristic of Hemichordata?

A. Direct development without a larval stage. B. Direct development with parental care. C. Indirect development involving a free-swimming larval stage. D. Asexual reproduction through budding.

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Explanation

The NCERT text states, 'Development is indirect' for Hemichordata. Indirect development typically implies the presence of a larval stage before reaching the adult form.

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Before being recognized as a separate phylum, Hemichordata was classified as a sub-phylum under which larger phylum?

A. Echinodermata B. Annelida C. Chordata D. Mollusca

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Explanation

The NCERT text explicitly states, 'Hemichordata was earlier considered as a sub-phylum under phylum Chordata. But now it is placed as a separate phylum under non-chordata.'

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The body of a Hemichordate is distinctly divided into three regions. These regions are:

A. Head, Thorax, Abdomen B. Proboscis, Collar, Trunk C. Cephalothorax, Abdomen, Telson D. Foot, Visceral hump, Mantle

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Explanation

The NCERT text describes the Hemichordate body as 'composed of an anterior proboscis, a collar and a long trunk'.

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