Tag: chordates and hemichordates

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Questions Related to chordates and hemichordates

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'.

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

Chorda dorsalis is

  1. Dorsal solid nerve cord

  2. Dorsal hollow nerve cord

  3. Notochord

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

Chorda dorsalis originates from Latin. Chorda literally means 'sting' and dorsum means 'back'. Hence the answer is 'notochord' because it is the spinal column which is present on the dorsal side of an embryo. The notochord is a common aspect of all Chordates.

So, the correct answer is 'Notochord'.

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'