Tag: zoology

Quizzes (289) Questions (5869)

Questions Related to zoology

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

Which of the following is not a characteristic of hemichordates?

  1. They are widely distributed in shallow, marine and tropical waters

  2. They have epidermal nervous system

  3. Most of them have pharyngeal slits

  4. They have cylindrical body
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hemichordates may not always have a cylindrical body, cylindrical body is the main characteristics of nematodes. Rest all are the characteristics of hemichordates.

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

Multicellular organisms with pores are called

  1. Protozoans

  2. Poriferans

  3. Arthropodans

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

Poriferans are commonly known as sponges. They are multicellular organisms with cellular level of organization. They are sessile and sedentary in nature. These have an exoskeleton made up of either spongin fibers or calcareous or siliceous spicules. The spicules form the skeleton of the body which provides protection. These spicules are  formed by sclerocyte cells present in the mesenchyme.

So, the correct answer is option B.

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

Which of the following is not a class of Hemichordata ?

  1. Pterobranchia

  2. Enteropneusta

  3. Planctosphaeroidea

  4. Ascidiacea
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ascidiacea is a class of subphylum urochordata. Rest all  pterobranchiaEg. Rhabdopleura; Enteropneusta Eg. Acorn worms (Balanoglossus, Saccoglossus);planctosphaeroidea Eg. Planctosphaertara pelagica are class of Hemichordata.

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

Which group of protochordates contains Balanoglossus?

  1. Urochordata

  2. Cephalochordata

  3. Tunicata

  4. Hemichordata
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A) Urochordata is a subphylum of the phylum Chordata and is included in protochordata. It does not include Balanoglossus.

B) Cephalochordata is a subphylum of the phylum Chordata and is included in protochordata It does not include Balanoglossus.
C) Tunicata is another word for Urochordata.
D) Hemichordata is a phylum included in protochordata and includes Balanoglossus.
Hence, the correct answer is 'Hemichordata'.

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

In hemichordates, the dorsal nerve cord is

  1. Absent

  2. Present throughout

  3. Restricted to tongue region

  4. Restricted to collar region
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In hemichordates and chordates nerve cord is dorsally placed.

A) Hemichordates have a nerve cord. It is not absent in them.

B) Nerve cord although dorsal, is not present in hemichordates throughout the body.
C) Nerve cord is not present in the tongue region.
D) The nerve cord is present only in the collar region of the body.
So the correct answer is 'Restricted to collar region'.

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

The body of Tongue Worm Balanoglossus is differentiated into

  1. Head, trunk and tail

  2. Trunk and tail

  3. Proboscis, collar and trunk

  4. Proboscis and collar
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tongue worm Balanoglossus is a Hemichordate. The basic character of Hemichordates is a division of the body into proboscis, collar, and trunk.

A) Head and tail are not present in Balanoglossus.
B) The tail is absent in Balanoglossus.
C) The body of Balanoglossus is divided into proboscis, collar, and trunk.
D) Besides proboscis and collar, a trunk is also present.
So, the correct answer is 'Proboscis, collar, and trunk'.

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

In protochordates, the epidermis is

  1. Absent

  2. Multilayered

  3. A few layered

  4. Single layered
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Protochordata is included in the phylum Chordata. They possess a single layer of epidermis consisting of long columnar cells. In some cases such as Balanoglossus, these cells are ciliated. The lower layer dermis is absent in Protochordates. Thus, the correct answer is 'Single layered'.