In a typical mollusc:

I: Head, muscular foot and visceral hump are body segments.
II: Mantle over the visceral hump is formed by a layer of skin.
III: Radula is a file-like rasping organ

1. Only III is correct
2. Only II and III are correct
3. Only I and III are correct
4. Only I and II are correct

Subtopic:  Phylum Mollusca |
From NCERT
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Triploblastic, bilaterally symmetrical animals with true coelom but no segmentation are:
1. Aschelminthes 2. Molluscs
3. Annelids 4. Chordates
Subtopic:  Phylum Mollusca |
 80%
From NCERT
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Consider the given two statements:
Statement I: Sponges exhibit a cellular level of organization.
Statement II: Cnidarians have a tissue level of organization.
In light of the above statements, choose the most appropriate answer from the options given below:
1. Statement I is correct but Statement II is incorrect.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is incorrect but Statement II is correct.
Subtopic:  Phylum Porifera |
 90%
From NCERT
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The type of circulatory system, in which blood is circulated through a series of vessels [arteries, veins and capillaries] and never leaves the network of blood vessels, is called as:
1. An open circulatory system 2. A closed circulatory system
3. A lymphatic system 4. A portal circulation
Subtopic:  Basis of Classification |
 92%
From NCERT
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Regarding bilateral symmetry:
I: Bilateral symmetry is the body plan where the body of the animal can be divided into two identical halves through any plane passing through the central axis of the body.
II: While Ctenophores and adult Echinoderms have bilateral symmetry, Annelida and Arthropods have radial symmetry.
In light of the above statements, choose the most appropriate answer from the options given below:
1. Statement I is correct but Statement II is incorrect.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is incorrect but Statement II is correct.
Subtopic:  Basis of Classification |
 64%
From NCERT
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The triploblastic animals differ from the diploblastic animals in having:
1. Ectoderm 2. Mesoderm
3. Endoderm 4. Gastroderm
Subtopic:  Basis of Classification |
 93%
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Consider the given features:

A: Body cavity lined by mesoderm 
B: The mesoderm present as scattered pouches in between the ectoderm and the endoderm

Select the correct option of animals having the features A and B:

A B
1. Aschelminthes Annelids
2. Platyhelminthes Ctenophores
3. Arthropods Molluscs
4. Arthropods Aschelminthes
Subtopic:  Basis of Classification |
 82%
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In metameric segmentation:
I: The body is divided into segments only externally.
II: There is a serial repetition of at least some organs.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic:  Basis of Classification |
 68%
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The notochord:
I: is derived from embryonic mesoderm.
II: is present on the ventral side during embryonic development in chordates.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic:  Basis of Classification |
 73%
From NCERT
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The given figure shows broad classification of Kingdom Animalia based on common fundamental features. Which of the following can be true based on the information given in the figure?

a: Sponges represent ‘A’
b: ‘B’ includes flatworms
c: Animals in ‘C’ are triploblastic
d: Radial symmetry is seen in adults of animals in ‘D’
e: Animals in ‘E’ have a complete digestive system

1. only a, c and e 2. only a, b and e
3. only b and d 4. only a, c and d
Subtopic:  Basis of Classification |
 76%
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