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

Notochord like structure is present in hemichordates in the region

  1. Proboscis

  2. Collar

  3. Trunk

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

In Hemichordates, there is a false notochord known as a stomochord.

A) Proboscis region has the stomochord. Since the stomochord passes through the mouth it is known as 'stomo'chord. Stomo means mouth.
B) Collar region does not have the stomochord.
C) trunk region does not have the stomochord.
D) There is no tail region in the body of hemichordates.
So, the answer is 'proboscis'.

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

Who raised the status of hemichordates from subphylum to phylum?

  1. Linnaeus

  2. Lamarck

  3. Horst

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

Hemichordates were earlier a subphylum in the phylum Chordata. Later they were made into a separate phylum.

A) Linnaeus was a Swedish scientist who formulated the binomial nomenclature and made many other contributions to science. He did not separate Hemichordata from Chordata.
B) Lamarck did not separate Hemichordata from Chordata. But he is known for contributions like his idea of biological evolution.
C) Horst did not separate Hemichordata from Chordata. He was a German physicist.
D) Belfour separated Hemichordata from Chordata. He was a fellow of the Royal Society and was awarded their Royal Medal.
So, the answer is 'Belfour'.

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

Heart of hemichordates is

  1. Ventral

  2. Dorsal

  3. Lateral

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

A) Ventral heart if present, is in non-chordates except Hemichordates.

B) Dorsal heart is present in Hemichordates and chordates.
C) Lateral heart is not present in any animal.
D) Hemichordates have a well developed circulatory system with a heart.
So, the correct answer is 'dorsal'

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

Notochord like structure of hemichordates is

  1. Protochord

  2. Stomochord

  3. Pallium

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

Hemichordates do not have a notochord but a false notochord.

A) Prochordata is an informal group of organisms which consists of hemichordates, cephalochordates and urochordates. It is not related to the notochord.
B) Stomochord is the notochord like structure in hemichordates.
C) Pallium is present in the cerebrum of the brain. It is not notochord like structure.
D) Glomerulus is located in kidneys. It is not notochord like structure.
So, the correct answer is 'Stomochord'

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

Which of the following statements is/are not true?
a. In urochordata, notochord is present only in larval tail.
b. In cephalochordata, notochord extends from head to tail.
c. Branchiostoma belongs to hemichordata.
d. Only one class of living members, class cyclostomata, represents the super class agnatha.

  1. a, b and d only

  2. c, d, and a only

  3. c only

  4. a and d only

  5. c and d only
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Statement 'c' is incorrect because Branchiostoma (Amphioxus) belongs to Cephalochordata, not Hemichordata. Statements a, b, and d are biologically accurate.

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

Hemichordates constitute a connecting link between

  1. Protochordates and Chordates

  2. Echinoderms and Chordates

  3. Molluscs and Echinoderms

  4. Molluscs and Chordates
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hemichordates were historically considered a sub-phylum of Chordata, but are now a separate phylum that serves as a link between non-chordate invertebrates and true chordates.

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

The feature that is not a characteristic of Protochordata?

  1. Presence of notochord

  2. Bilateral symmetry and coelom

  3. Jointed legs

  4. Presence of circulatory system
Reveal answer Fill a bubble to check yourself
C Correct answer
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'

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

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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".