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 animal diversity - i (inverterbrate phyla) structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

Choose the correct answers from the alternatives given.
External ears are characteristics of.

  1. cartilaginous fishes

  2. sea horse

  3. mammals

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

The ear has external, middle, and inner portions. The outer ear is called the pinna and is made of ridged cartilage covered by skin. Sound funnels through the pinna into the external auditory canal, a short tube that ends at the eardrum. These are the characteristic of mammals.

So, the correct option is 'Mammals'.

Multiple choice zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

In Pheretima, the segments without setae are 

  1. First, last and clitellar segments

  2. Only clitellar segments

  3. Only fourth segment

  4. Only second segment
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Except for the first, clitellar and last segment, all the other segments have eight setae located around each segment. 
  • The setae look like small bristles sticking out of the earthworm’s skin. The setae can be retracted and are for moving through the soil. The bristle-like setae anchor the segments as they crawl.
So, the correct option is 'First, last and clitellar segments'.

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

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

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. 
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.