Tag: zoology

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Questions Related to zoology

Multiple choice zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

Balanoglossus is commonly known as 

  1. Peacock worm

  2. Acorn worm

  3. Sand worm

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Balanoglossus is an ocean-dwelling 'acorn worm', genus of Hemichordata. It is an 'evolutionary link' between invertebrates and vertebrates. It has a notochord in the upper part of the body and has no nerve chord. Hence, option B is correct.

Multiple choice zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

The larval form of Hemichordata is called as 

  1. Trochophore

  2. Tornaria

  3. Tadpole

  4. Ammocete
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A tornaria is the planktonic larva of some species of Hemichordata. Trochophore is the larva of marine annelids and most groups of molluscs.
A tadpole is a larval stage in the life cycle of an amphibian. Ammocoete is the larval stage of lamprey.

So, the correct answer is option B.

Multiple choice zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

Protochordates are 

  1. Mucous feeders

  2. Water current feeders

  3. Ciliary feeders

  4. Predators
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Protochordates are the invertebrate members of Chordata and include urochordates (sea squirts) and cephalochordates (amphioxus, lancelets). Cephalochordates are filter feeders that use cilia to generate a current of water and phytoplankton particles into the mouth. 

So, the correct answer is option C.

Multiple choice zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

In Amphioxus notochord is present only in

  1. In embryo

  2. In adult

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Amphioxus are fish-like marine chordates. The notochord is a flexible rod-shaped body found in embryos of all chordates. It is composed of cells derived from the mesoderm and defines the primitive axis of the embryo. In case of Amphioxus, it is retained in the adults.

So, the correct answer is option C.

Multiple choice zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

Kidneys of protochordates are

  1. Protonephric

  2. Mesonephric

  3. Metanephric

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Protochordates consists of the organisms that are categorized under subphyla Urochordata and Cephalochordata. Protochordates are also called as Acraniata, due to the lack of head and cranium. These organisms are extremely marine and have small sized bodies. In protochordates, kidneys contain protonephridia, whereas, in euchordates, kidneys contain meso- or metanephridia.

So, the correct answer is option A.

Multiple choice zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

Body wall of Hemichordates is composed of 

  1. Only epidermis

  2. Only dermis

  3. Epidermis and dermis both

  4. Mucous glands
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hemichordata is a phylum of marine deuterostome animals. They show characteristics of both Echinoderm and Chordates. They show bilateral symmetry and are triploblastic. Body is unicellular and is composed of epidermis. Body consists of three regions, proboscis, collar and trunk.

Thus, the correct answer is option A. 

Multiple choice zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

All protochordates are

  1. Aquatic

  2. Marine

  3. Fresh water

  4. All of the the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Protochordates are closely related to vertebrates. They differ from the chordate by not having a backbone. They are marine worms that share some, but not all of the characteristics of chordates. All living protochordate are strictly marine and are isosmotic with the sea.

So, the correct answer is option B.

Multiple choice zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

.................. are included under protochordata.

  1. Cephalochordata

  2. Urochordata

  3. Hemichordata

  4. All the the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Protochordates are closely related to vertebrates. These lack some of the peculiar characteristics of chordates like the true skull, brain, skeleton. These are invertebrates. This group is composed of the phylum Hemichordata and the subphylum Urochordata and Cephalochordata.
So, the correct answer is option D.

Multiple choice zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

__________ has a notochord but no vertebral column.

  1. Amphioxus

  2. Petromyzon

  3. Tadpole larva of urodeles

  4. Myxine
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Amphioxus or lancelets comprise approximately of 32 species of fish-like marine chordates. In the lancelet, there is a nerve cord above the notochord, but no cranium or vertebrae or eyes.
So, the correct answer is option A.

Multiple choice zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

The roof of oral hood in Amphioxus show the presence of Hatschek's pit which is responsible for the secretion of 

  1. Bile

  2. Saliva

  3. Mucus

  4. Amylase
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The roof of the oral hood in Amphioxus show the presence of Hatschek's pit which is responsible for the secretion of mucus. This mucus secretion helps to entrap food particles present in the water.

So, the correct answer is 'Mucus'.