Which of the following animals exhibit all these characters – bilateral symmetry, triploblastic, segmented and eucoelomate?

1.  Echinoderms

2.  Roundworms

3.  Molluscs

4.  Annelids

Subtopic:  Phylum Annelida |
 83%
From NCERT
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What is incorrect regarding cyclostomes?

1.  They are ectoparasites on some fishes

2.  They have a circular mouth without jaws

3.  Circulation is of open type

4.  They are marine but migrate to fresh water for spawning

Subtopic:  General Introduction: Vertebrates & Agnatha |
 93%
From NCERT
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Which of the following is not true about Porifera

1.Cellular level of organisation

2.Radial symmetry

3.Tissue is absent

4.Canal system is present

Subtopic:  Phylum Porifera |
 81%
From NCERT
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The central cavity of the sponges is known as

1.spongocoel

2.Ostia

3.Osculum

4.Gastro-vascular cavity

Subtopic:  Phylum Porifera |
 91%
From NCERT
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The minute pores in the  body wall of the sponges is known as

1.spongocoel

2.Ostia

3.Osculum

4.Spicules

Subtopic:  Phylum Porifera |
 87%
From NCERT
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Water canal is lined by

1.Spongin fibres

2.Choanocytes

3.Collar cells

4.Both 2 and 3

Subtopic:  Phylum Porifera |
 86%
From NCERT
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Canal system in sponges helps in

1.Food gathering

2.Respiratory exchange

3.Removal of waste

4.All of the above

Subtopic:  Phylum Porifera |
 99%
From NCERT
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In sponges, digestion is

1.Intercellular

2.Intracellular

3.Both inter and inter cellular

4.Gastric cavity

Subtopic:  Phylum Porifera |
 74%
From NCERT
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The mode of reproduction in sponges is

1.Sexual

2.Asexual

3.Both 1 and 2

4.None of these

Subtopic:  Phylum Porifera |
 84%
From NCERT
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Which of the following is true about sponges except

1.Sponges are hermaphrodite

2.Fertilisation is internal

3.Development is direct

4.Primitive multicellular animals

Subtopic:  Phylum Porifera |
 78%
From NCERT
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