Tag: zoology

Questions Related to zoology

Proboscis gland in Balanoglossus is associated with

zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

  1. Digestion

  2. Respiration

  3. Excretion

  4. Reproduction

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Correct Option: C

Hemichordates have close affinites with which of the following phylum?

zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

  1. Annelida

  2. Arthropoda

  3. Echinodermata

  4. Mollusca

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Correct Option: C

Nutrition of Balanoglossus is

zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

  1. Phagotrophic

  2. Parasitic

  3. Saprozoic

  4. All of the above

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Correct Option: A

Velum is found in

zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

  1. Herdmania

  2. Amphioxus

  3. Branchiostoma

  4. Both B and C

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Correct Option: D

Hemichordates constitute a connecting link between

zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

  1. Protochordates and Chordates

  2. Echinoderms and Chordates

  3. Molluscs and Echinoderms

  4. Molluscs and Chordates

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Correct Option: A

Notochord occurs between

zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

  1. Body wall and dorsal nerve cord

  2. Dorsal nerve cord and alimentary canal

  3. Ventral nerve cord and alimentary canal

  4. Ventral nerve cord and body wall

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Correct Option: A

In Balanoglossus, excretion occurs with the help of

zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

  1. Protonephridium

  2. Kidney

  3. Probascis gland

  4. Both A and C

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Correct Option: C

Starvation leads to decrease in size of 

zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

  1. Balanoglossus

  2. Saccoglossus

  3. Herdmania

  4. Branchiostoma

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Correct Option: A

The feature that is not a characteristic of Protochordata?

zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

  1. Presence of notochord

  2. Bilateral symmetry and coelom

  3. Jointed legs

  4. Presence of circulatory system

Show answer
Correct Option: C
Explanation:

A Protochordate belongs to any two invertebrate subphyla of the phylum Chordata- the Tunicates (sea squirts, salps, etc.) and the Cephalochordates (amphioxus). Like the remaining subphylum of the chordates, the Vertebrata, the protochordate has a hollow dorsal nerve cord, gill slits and a stiff supporting rod, the notochord, the forerunner of the backbone. The protochordate differs chiefly from the vertebrates in not having a backbone. Hence, they have bilateral symmetry, coelom, and a circulatory system. However, they lack jointed appendages

So, the correct answer is 'Jointed legs'

Which of the following is not a character of phylum Hemichordata?

zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

  1. Presence of stomochord which is mesodermal in origin

  2. Excretory organ is proboscis gland

  3. Circulatory system is open

  4. Respiration takes place through gills

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Correct Option: A
Explanation:

Phylum Hemichordata consists of a small group of worm-like marine animals with an organ-system level of organisation. The body is cylindrical and is composed of an anterior proboscis, a collar, and a long trunk. The circulatory system is of open type. Respiration takes place through gills. The excretory organ is proboscis gland.

So the correct option is "Presence of stomochord which is mesodermal in origin".