Tag: cnidaria

Quizzes (3) Questions (48)

Questions Related to cnidaria

Multiple choice zoology animal diversity - i (inverterbrate phyla) ctenophora phylum ctenophora cnidaria

Ctenophora got their names from

  1. Presence of colloblast cells

  2. Presence of paddle like comb plates

  3. Presence of cnidoblasts

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

Ctenophora is a phylum of animals that live in marine waters worldwide. Their most distinctive feature is the combs, which is groups of cilia they use for swimming. They are the largest animals that swim by means of cilia. Generally, the outer surface bears usually eight comb rows, called as swimming plates, which are used for swimming. Comb plates paddle plates in them are arranged circumferentially like seams in a football. 

So, the correct answer is option B.

Multiple choice zoology animal diversity - i (inverterbrate phyla) ctenophora phylum ctenophora cnidaria

Ctenophora shows affinities with 

  1. Cnidaria

  2. Aschelminthes

  3. Cephalopoda

  4. Turbellaria
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Ctenophora is a phylum of marine animals which has a diploblastic body like cnidarians. They consist of a jelly-like substance known as mesoglea between endoderm and ectoderm. Ctenophores also resemble cnidarians in having a decentralised nerve net rather than a brain. Both these groups rely on water flow through the body cavity for both digestion and respiration.
Thus, the correct answer is option A.

Multiple choice zoology animal diversity - i (inverterbrate phyla) ctenophora phylum ctenophora cnidaria

Biradial symmetry and lack of cnidoblasts are characteristic of 

  1. Hydra and starfish

  2. Starfish and sea anemone

  3. Ctenophora and Beroe

  4. Aurelia and Paramecium
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Beroe is also known as the mellon jellyfish and is the most common type of species of phylum Ctenophora. Ctenophora is known to have biradial symmetry. Each of the four parts is identical to the opposite side but different from the adjacent side. Cnidoblasts and nematocysts are absent in Ctenophora and are found in cnidarians. 

Thus, the correct answer is option C.

Multiple choice zoology animal diversity - i (inverterbrate phyla) ctenophora phylum ctenophora cnidaria

Comb jellies are placed under the group 

  1. Rotifera

  2. Acanthocephala

  3. Cnidaria

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

Ctenophora is a phylum of animals that lives in marine water. Their most distinctive feature is the combs and groups of cilia they use for swimming. They are the largest animals that swim by means of cilia.

So, the correct answer is option D.

Multiple choice zoology animal diversity - i (inverterbrate phyla) ctenophora phylum ctenophora cnidaria

Colloblast (adhesive) cells are the characteristic of 

  1. Hydra

  2. Comb jelly

  3. Obelia

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

Tentacles are the organs which are used to catch the prey. These are present at the opening of the gastrovascular cavity. Colloblasts are a cell type found in ctenophores. They are widespread in the tentacles of these animals and are used to capture prey. These are found in all ctenophores except those of the order Beroida, as they lack tentacles. So, the correct answer is option B.

Multiple choice zoology animal diversity - i (inverterbrate phyla) ctenophora phylum ctenophora cnidaria

Which has no skeleton?

  1. Cockroach

  2. Mosquito

  3. Butterfly

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

Jellyfish are the major non-polyp form of the individuals of the phylum Cnidaria. They are free-swimming marine animals consisting of a gelatinous umbrella-shaped bell and trailing tentacles. They do not possess a proper skeleton.
Therefore, the correct answer is option D.

Multiple choice zoology animal diversity - i (inverterbrate phyla) ctenophora phylum ctenophora cnidaria

True jelly fishes belongs to the class

  1. Scyphozoa

  2. Anthozoa

  3. Hydrozoa

  4. Both A and B
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Jellyfish are the organisms which belong to the group of class Scyphozoa. These are the organisms which do not form the structure of the polyp. They are from the phylum Coelenterate. There are many tentacles which are attached to the bell shaped body. 
Therefore, the correct answer is option A.
Multiple choice zoology animal diversity - i (inverterbrate phyla) ctenophora phylum ctenophora cnidaria

The characteristic feature of Ctenophora is

  1. Presence of eight comb plates for locomotion

  2. Absence of nematocysts

  3. Presence of colloblasts of lasso cells on the tentacles for capturing food

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

Ctenophora is a phylum of animals that live in marine waters. The outer surface bears usually eight comb rows. This is called as comb plates or swimming-plates, which are used for swimming. Ctenophora lack stinging nematocysts. Lasso cells are kind of defensive and offensive stinging cells. These are found in great numbers in all coelentrates. 

Thus, the correct answer is option D. 

Multiple choice zoology animal diversity - i (inverterbrate phyla) ctenophora phylum ctenophora cnidaria

Which of the following is an example of Ctenophora?

  1. Beroe and Cestum

  2. Ctenoplana

  3. Pleurobrachia

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

Ctenophora is a phylum of animals that live in marine waters. The outer surface bears usually eight comb rows. This is called as comb plates or swimming-plates, which are used for swimming. Ctenophora lack stinging nematocysts. Lasso cells are kind of defensive and offensive stinging cells. These are found in great numbers in all coelentrates.  The Beroe or Melon jellyfish and flattened species like Cestum belongs to Ctenophora. Ctenoplana is a genus of comb jellies andPleurobrachia is a common genus of Ctenophora.Thus, the correct answer is option D.

Multiple choice zoology animal diversity - i (inverterbrate phyla) ctenophora phylum ctenophora cnidaria

Ctenophores exhibit

  1. Radial symmetry

  2. Asymmetry

  3. Biradial symmetry

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

  • Ctenophora are also known as comb jellies. This is a phylum of animals that lives in marine waters. 
  • Many species in this group have the body which is biradially symmetrical. The main axis is oral to aboral (from the mouth to the opposite end). This gives the bilateral form. 
  • The tentacles are present around the mouth. These tentacles radiate outwards. This gives the radial form of symmetry. Thus, the type of symmetry is known as biradial symmetry. 

Therefore, the correct answer is option C.