NEET Zoology Animal Kingdom Questions Solved


Which of the following developed for the first time in Annelids?

(1) Cephalization

(2) Development of a true coelom

(3) Metameric segmentation

(4) Both 2 and 3

(4) Metamerism is presence of linear series of body segments. These segments are fundamentally similar in structure. All structure may not be exactly alike. This appeared for the first time in Annelids. In Annelida, true coelom also appeared for the first time in the course of evolution.

Difficulty Level:

  • 11%
  • 32%
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Consider the following characters:

I. Air bladder

II. Operculum

III. Viviparity

The characters present in bony fishes include:

(1) I, II and III

(2) I and III only

(3) I and II only

(4) II and III only

(3) Viviparity is a feature of some cartilaginous fishes as in Sharks. Air bladder and gill covers [operculum] are seen in bony fishes.

Difficulty Level:

  • 20%
  • 17%
  • 55%
  • 9%

Homeothermy is exhibited by:

(1) All amniotes

(2) Birds and Mammals

(3) All dueterostomes

(4) Reptiles and Mammals

(2) The maintenance by an animal of its internal body temperature at a relatively constant value by using metabolic processes to counteract fluctuations in the temperature of the environment. Homoiothermy occurs in birds and mammals, which are described as endotherms.

Difficulty Level:

  • 8%
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Consider the following characteristics of Porifers:

I. Collared cells called as choanocytes

II. Canal system with pores (ostia) in body wall

III. Mineral spicules

IV. High cellular mobility and totipotency

Which of these can be regarded as synapomorphies of Porifera?

(4) Traditionally, sponges have been regarded as a monophyletic group defined by several synapomorphies, including the presence of:

1. choanocytes

2. an aquiferous sytem with external pores

3. ineral spicules

4. high cellular mobility and totipotency

The latter feature is often considered to be the most important. Indeed, the sponge body is unique among animals because it continuously remolds itself to fine-tuune its filter-feeding system. The constant rearrangement of the body is accomplished by the amoeboid movements of cells inside the sponge and their change from one differentiated form to another.

Synapomorphy is a characteristic present in an ancestral species and shared exclusively (in more or less modified form) by its evolutionary descendants.

Difficulty Level:

  • 24%
  • 38%
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Identify the incorrect statement:

(1) Medusae of Scyphozoans are called as jelly fishes.

(2) Ctenophores are the largest animals that move with the help of cilia.

(3) Flat worms that have a digestive cavity have an incomplete gut.

(4) Nematodes are covered with thick cuticle that does not moult.

(4) Actually, nematodes undergo molting multiple times such as in Ascaris.

Difficulty Level:

  • 17%
  • 33%
  • 20%
  • 32%

Match Nematode with their common names and choose answer from codes given below:

 

Nematode

 

Common names

I.

Ancylostoma duodenale

1.

Pin worm

II.

Enterobius vermicularis

2.

Filaria worm

III.  

Trichuris trichiura

3.

Loa loa

IV.

Dracunculus medinensis    

4.

Whip worm

V.

Onchocerca volvulus

5.   

Hook worm

VI.

Wuchereria bancrofti

6.

Guinea worm

Codes:

 

I.

II.

III.

IV.

V.

VI.

(1)   

5       

1      

4      

6      

3      

2

(2)

5

4

3

6

1

2

(3)

5

3

4

1

6

2

(4)

5

6

4

3

1

2

(1) Factual.

Difficulty Level:

  • 43%
  • 30%
  • 21%
  • 9%

What is the most important reason for the immense success of arthropods?

(1) Chitinous exoskeleton

(2) Uricotelic nature

(3) Compound eye

(4) Multipurpose appendages

(4) Appendages in arthropods are equated with multi-utility "Swiss Knife". There is huge variety in these appendages. Chitinous exoskeleton is actually important for terrestrial life.

Difficulty Level:

  • 58%
  • 7%
  • 10%
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What is not true for a generalized mollusc?

(1) Body segmented into head, visceral mass and foot.

(2) A rasping tongue like organ – radula present.

(3) Mantle cavity with gills

(4) Excretory structures – nephridia

(1) Though these parts are seen in a generalized mollusc but these are not SEGMENTS.

Difficulty Level:

  • 23%
  • 10%
  • 13%
  • 55%

How many of the characters given below are true for echinoderms?

I. An endoskeleton of calcareous ossicles

II. The adult echinoderms are radially symmetrical but larvae are bilaterally symmetrical.

III. They are triploblastic and coelomate animals.

IV. Digestive system is complete.

V. Water vascular system

VI. Sexual reproduction, internal fertilization and direct development.

(1) 3

(2) 4

(3) 5

(4) 6

(3) Fertilization is usually external and development indirect.

Difficulty Level:

  • 11%
  • 23%
  • 50%
  • 17%

Which of the following is not seen in hemicordates?

(1) A tripartite body organization

(2) Stomochord

(3) Rudimentary notochord

(4) Proboscis gland

(3) They do not have a notochord at any stage. This is why they have been removed from Chordata. Stomochord is different from notochord.

Difficulty Level:

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  • 10%