Q. No.In Obelia:
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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| Statement 1: | Hemichordates were earlier considered as a sub-phylum under Phylum Chordata but are now placed separately in a phylum under non-Chordata. |
| Statement 2: | Hemichordates have a rudimentary structure in the collar region called stomochord, a structure homologous to the notochord. |
| 1. | Both Statement 1 and Statement 2 are correct but Statement 2 does not explain Statement 1. |
| 2. | Statement 1 is correct and Statement 2 is incorrect. |
| 3. | Both Statement 1 and Statement 2 are incorrect. |
| 4. | Both Statement 1 and Statement 2 are correct and Statement 2 explains Statement 1. |
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1. Circulatory system is a closed type
2. Proboscis gland is a digestive gland that secretes a large number of hydrolytic enzymes
3. Respiration takes place through the gills
4. Sexes are not separate, fertilization is internal and development is direct
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| a. | A notochord |
| b. | Ventral, solid, and double central nervous system |
| c. | Pharynx perforated by gill slits |
| d. | Ventral heart |
| e. | Terminal anus and a lack of post-anal tail |
| 1. | a, c, and d only | 2. | a, b. and e only |
| 3. | a and c only | 4. | b, c, and d only |
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