Tag: animal diversity - i (inverterbrate phyla)

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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.

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 shows several affinities with Cnidaria, some of them are:

1. The radial and tetramerous symmetry of the body, like the medusa of the hydrozoans.
2. Arrangement of parts along oral-aboral axis. 
3. Presence of branching gastrovascular canals and absence of coelom.
4. Presence of tentacles and statocyst.
5. Endodermal nature of gonads etc.
Hence, option A is correct.

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

Which of the following phylum includes comb jelly?

  1. Mollusca

  2. Echinodermata

  3. Coelenterata

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

Ctenophores, commonly known as sea walnuts or comb jellies are exclusively marine, radially symmetrical, diploblastic organisms with tissue level of organization. The germs layers include ectoderm and endoderm. 

So, the correct answer is option D.

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

Hydra recognizes its prey by

  1. Nematocyst

  2. Smell

  3. Sensitivity

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

Hydra traps its prey by  tentacles which are present at the opening of the gastrovascular cavity. Scattered over the outer layer tentacles are a great many of these stinging cells called cnidoblasts. Each cnidoblast contains a capsule (nematocyst) from which projects a small trigger called a cnidocil. Inside each capsule is a tiny hollow thread. It is inverted like a finger of a glove which is pushed into the hand part. These threads are the food-catching apparatus. 

So, the correct answer is option A.

Multiple choice zoology animal diversity - i (inverterbrate phyla) ctenophora phylum ctenophora cnidaria
 A. Symmetry of ctenophorans  1. Haeckelia
 B. Ctenophora with nematocyst  2. Radial
 C. Habitat of comb jellies   3. Colloblast
 D. Specialised cells of comb jellies  4. Marine


  1. A- 3, B- 4, C- 2, D- 1

  2. A- 4, B- 3, C- 2, D- 1

  3. A- 1, B- 2, C- 3, D- 4

  4. A- 2, B- 1, C- 4, D- 3
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The ctenophores have radial symmetry. They have elongated and tubular body. They are attached to the substratum by on end. The other end has an opening called as mouth which is surrounded by long tentacles. Thus, the symmetry of these organism are called as biradial symmetry. 
Species of Haeckelia are known to carry nematocysts on their medusae. They carry the nematocysts on their tentacles. There are nematocysts which are arranged on the medusae. 
Habitat of comb jellies is marine waters. They can survive in shallow waters as well as in depth. Some of the species are found near the water surface.
Specialised cells are present in comb jellies which are known as colloblasts. These are sticky type of cells and adhere to the prey. This helps in capturing the prey as these organisms lack the stinging cells. 
Thus, the correct answer is option D.