Consider the following characteristics of Porifers. Which of these can be regarded as synapomorphies of Porifera?

1. Collared cells called as choanocytes

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

3. Mineral spicules

4. High cellular mobility and totipotency

Subtopic:  Phylum Porifera |
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Identify the incorrect statement:

1. Medusa 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.

Subtopic:  Phylum Ctenophora & Platyhelminthes | Phylum Aschelminthes |
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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

Subtopic:  Phylum Aschelminthes |
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What is the most important reason for the immense success of arthropods?

1. Chitinous exoskeleton

2. Uricotelic nature

3. Compound eye

4. Multipurpose appendages

Subtopic:  Phylum Arthropoda |
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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

Subtopic:  Phylum Mollusca |
From NCERT
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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

Subtopic:  Phylum Echinodermata |
 59%
From NCERT
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Which of the following is not seen in hemichordates?

1. A tripartite body organization

2. Stomochord

3. Rudimentary notochord

4. Proboscis gland

Subtopic:  Phylum Hemichordata |
From NCERT
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Consider the following features:

I. Ampulla of Lorenzini

II. Operculum or gill cover

III. Ureotelism

IV. Viviparity

V. Swim bladder

VI. Lateral line system

The features that can be attributed to cartilaginous fishes are:

1. I, III and IV only

2. II, V and VI only

3. I, II, III and IV

4. All

Subtopic:  Comparative study of Cartilagenous & Bony Fishes |
 56%
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Key features that appeared for the first time in amphibians do not include:

1. Legs

2. Nutritional deficiencies

3. Lungs

4. Pulmonary veins

Subtopic:  Study of Amphibians |
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Consider the following characters:

I. Wish bone furculum

II. Pneumatic bones

III. Feathers

IV. Endothermy

V. Left aortic arch

VI. Four chambered heart

Which of these are unique to birds?

1. I, II and III only

2. I, II, III and IV only

3. I, II, III, IV and V only

4. All

 

Subtopic:  Study of Aves & Mammals |
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