Q. No.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
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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 |
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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| a: | both polyp and medusa forms exist during its life cycle |
| b: | metagenesis, a sort of alternation of generation, is seen |
| c: | polyps produce medusae sexually and medusae form the polyps sexually |
| 1. | only a is correct | 2. | only a and b are correct |
| 3. | only c is correct | 4. | a, b and c are correct |
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| a: | body bears eight external rows of ciliated comb plates, which help in locomotion. |
| b: | reproduction takes place only by asexual means. |
| c: | digestion is both extracellular and intracellular. |
| d: | sexes are separate. |
| 1. | a and c only | 2. | b and d only |
| 3. | a, b and c only | 4. | a, b and d only |
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1. having two germ layers instead of three
2. lacking a coelom
3. showing bioluminescence
4. having a complete digestive system
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| 1. Annelida | 2. Platyhelminthes |
| 3. Aschelminthes | 4. Chordata |
1. have a true coelom lined by embryonic mesoderm
2. have a closed circulatory system
3. do not reproduce by sexual methods
4. have a complete digestive system
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1. It is the second largest animal Phylum after Phylum Arthropoda.
2. It includes animals that are bilaterally symmetrical, triploblastic, and coelomate.
3. Body is covered with a calcareous shell and is metamerically segmented with a distinct head, muscular foot, and visceral hump.
4. Gills are present in the mantle cavity, a space between the mantle and the hump.
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1. They have bilateral symmetry as adults and radial symmetry as larvae.
2. They are triploblastic and coelomates.
3. They possess a well-developed excretory system.
4. They have an incomplete digestive system.
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