Biology · Science General

Diversity in Living Organisms

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The diversity in living organisms deals with the classification of life forms into various kingdoms and phyla. This topic covers specific traits of bacteria, animal body cavities, and structural adaptations for survival. These fundamentals are crucial for biology sections in medical entrance and state board exams.

Animal phyla characteristicsBacteria and flagellaBiological adaptationsKingdom Animalia classificationBody cavity typesExtinct organism subphylaJawless animals identification

Diversity in Living Organisms Questions

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

Hemichordates are the connecting link between

  1. Urochordates and cephalochordates

  2. Cephalochordates and vertebrates

  3. Urochordates and vertebrates

  4. Non-chordates and chordates
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hemichordates means half chordates. It is a connecting link between non-chordates and chordates as they share some characteristics of both. The chordates have creatine in their energy cycle for the muscle contaction while non-chordates have arginine but the hemichordates have both i.e., creatine as well as arginine.

So, the correct answer is option D.

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

Which one of the following is not true for protochordates?

  1. Presence of dorsal nerve cord

  2. Tail behind the anal opening

  3. Presence of gill slits

  4. Presence of segmented body
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Protochordates are characterized by the presence of dorsal nerve cord, tail behind the anal opening, presence of gill slits.
The segmented body is mainly seen in annelids and arthropods amongst the invertebrates.
So, the correct answer is option D.
Multiple choice zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

The feature that is not a characteristics of protochordata?

  1. Presence of notochord

  2. Bilateral symmetry and coelom

  3. Jointed legs

  4. Presence of closed circulatory system

  5. Both C and D
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Protochordates are the animals having a dorsal hollow nerve cord, pharyngeal gill slits, and a notochord. They are usually referred to as the oldest chordates. They mainly include tunicates and cephalochordates. They are bilaterally symmetrical and possess a coelom. They do not have a closed circulatory system or jointed legs.

So, the correct answer is 'Both C  and D'.

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

Hemichordata posses .......... for respiration.

  1. Lungs

  2. Gill slits

  3. Alveoli

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

Hemichordates consists of a small group of worm-like marine animals with an organ-system level of organization. They are nonchordates. The circulatory system is of open type. The blood flows to a cavity known as hemocoel which bathes the organs directly with oxygen and nutrients and there is no distinction between blood and interstitial fluid. They respire with help of gill slits.

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 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

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'.

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

Acorn Worm is

  1. Doliolum

  2. Salpa

  3. Balanoglossus

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

Acorn worm is an any of the soft-bodied invertebrate belonging to phylum Hemichordata.

A) Doliolum is a urochordate.
B) Salpa is a urochordate.
C) Balanoglossus is another name for acorn worm.
D) Rhabdopleura is hemichordates but are not acorn worms.
So, the answer is ' Balanoglossus'.