I: | This is seen in sponges, cnidarians, ctenophores and larval echinoderms. |
II: | This type of body symmetry is generally seen in animals which move actively in their environment. |
1. Only I | 2. Only II |
3. Both I and II | 4. Neither I nor II |
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I: | This type of life cycle is called as metagenesis and it is a sort of alternation of generation. |
II: | Polyps in the life cycle of cnidarians are haploid and medusae are diploid. |
I: Most sponges work rather like chimneys: they take in water at the bottom and eject it from the osculum ("little mouth") at the top. II: The inner surface is covered with choanocytes where the wave-like motion of the whip-like flagella drives water through the sponge's body. 1. I is correct and II is incorrect. 2. I is incorrect and II is correct. 3. I is correct and II is also correct. 4. I is incorrect and II is also incorrect. |
1. A sponge | 2. A Cnidarian |
3. A Ctenophore | 4. A flatworm |
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A | B | C | D | E | F | |
1. | Blood vessel | Nerve cord | Trachea | Spiracles | Crop | Hearts |
2. | Blood vessel | Nerve cord | Trachea | Spiracles | Oesophagus | Hearts |
3. | Nerve cord | Blood vessel | Trachea | Spiracles | Crop | Ostia |
4. | Nerve cord | Blood vessel | Stomo- chord |
Ostia | Oesophagus | Spiracles |
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