1. | Ectoderm | 2. | Mesoderm |
3. | Endoderm | 4. | Gastroderm |
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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 |
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I: | The body is divided into segments only externally. |
II: | There is a serial repetition of at least some organs. |
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I: | is derived from embryonic mesoderm. |
II: | is present on the ventral side during embryonic development in chordates. |
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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 |
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1. | Choanocyte and helps sponges in movement of water through their canal system |
2. | Choanocyte and helps sponges in reproducing asexually under favourable conditions |
3. | Cnidocyte and helps sponges in catching their prey by paralyzing them |
4. | Colloblast and helps sponges in sticking to a surface |
1. | Water enters the sponge body through ostia into a spongocoel from where it goes out through the osculum. |
2. | Body is supported by a skeleton made up of spicules or spongin fibres. |
3. | Sexes are not separate. |
4. | Fertilization is external. |
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Regarding the cell shown in the given figure:
I: The name Cnidaria is derived from this cell | |
II: The stinging capsule present in the cell is called as nematode | |
III: These cells help cnidarians in anchorage, defence and in capturing the prey |
1. While I and II are correct, III is incorrect
2. I, II and III are correct
3. Only II is incorrect
4. Only I is correct
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1. | Gastrovascular cavity has a single opening, mouth on hypostome. |
2. | Corals are cnidarians and have a skeleton of calcium carbonate. |
3. | They exhibit tissue level of organization and are diploblastic. |
4. | Digestion is exclusively intracellular. |
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I: | Polyp is sessile and cylindrical form as seen in Hydra and Adamsia. |
II: | Medusa is umbrella-shaped and free swimming form as seen in Aurelia. |
1. | Only I is correct | 2. | Only II is correct |
3. | Both I and II are correct | 4. | Both I and II are incorrect |
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