Biology · Science General

Diversity in Living Organisms

3,323 Questions

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

Why does the Ctenophora is a minor phylum?

  1. It includes small sized animals.

  2. It includes only few genera.

  3. It does not includes animals of economic importance.

  4. It was included earlier in Cnidaria.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ctenophora is considered as a small phylum. The phylum contains very few genera and only about 80 species. This group includes a set of marine animals. These organisms are commonly called as comb jellies. Earlier, this phylum was placed under Coelenterata. Hatschek placed it under a separate phylum. 

Thus, the correct answer is option B. 

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

Biradial symmetry and lack of cnidoblasts are the characteristic of 

  1. Hydra and starfish

  2. Starfish and sea anemone

  3. Ctenoplana and Beroe

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

Biradial symmetry and lack of cnidoblasts are characteristics of phylum Ctenophora. They have adhesive structure, known as coloblasts instead of cnidoblasts. Both Ctenoplana and Beroe are ctenophores. Hence, option C is correct.

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

Comb jellies belong to the phylum

  1. Ciliophora

  2. Coelenterata

  3. Porifera

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

Comb jellies are oval-shaped animals with eight rows of tiny comb-like plates that they beat to move through the water.  They are gelatinous animals belonging to the phylum of animals that live in marine waters worldwide, ctenophora.
Thus, the correct answer is option D.

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

Select the taxon whose members live exclusively in marine water.

  1. Annelida

  2. Ctenophore

  3. Arthropoda

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

Ctenophora, commonly known as comb jellies, is a phylum whose members are exclusively marine and live only in salt water, unlike groups such as Annelida, Arthropoda, and Mollusca which have many terrestrial and freshwater species.

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

Intermediate between diploblastic and triploblastic body structure is found in

  1. Porifers

  2. Coelenterates

  3. Ctenophores

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

Some animals are three layered with ectoderm, endoderm and mesoderm called triploblastic.  Ctenophores have two main layers of cells that sandwich a middle layer of jelly-like material, which is called the mesoglea. So, even though the layers of tisse are diploblastic the presence of the third jelly-like layer gives them an intermediate stage.

So, the correct answer is 'Ctenophores'.

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

Biradial symmetry and lack of cnidoblasts are characteristics of

  1. Hydra and Starfish

  2. Starfish and Sea Anemone

  3. Ctenoplana/Ctenophora and Beroe

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

Biradial symmetry is a combination of radial and bilateral symmetry, as in the ctenophores. Here, the body components are arranged with similar parts on either side of a central axis, and each of the four sides of the body is identical to the opposite side but different from the adjacent side. Also, Cnidblasts being exclusive Cnidarian character does not exist in Ctenophora.

So, the correct answer is 'Ctenoplana and Boroe'.

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

Ctenophores possess statocysts in

  1. Oral region

  2. Aboral region

  3. Base of comb plates

  4. Base of tentacles
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Statocysts are a balance organ present in ctenophores. This provides equilibriuim for the organism while swimming. These statocysts are situated away from the oral or mouth region also called the aboral region. 

So, the correct answer is 'Aboral region'.