I: | The eyes have eyelids. |
II: | A tympanum represents the ear. |
III: | Alimentary canal, urinary and reproductive tracts open into a common chamber called cloaca which opens to the exterior. |
IV: | The heart is three-chambered. |
V: | These are cold-blooded animals. |
1. | Urochordata | 2. | Cephalochordata |
3. | Cyclostomata | 4. | Hemichordata |
1. | Flatworm | 2. | Roundworm |
3. | Annelid | 4. | Mollusc |
Assertion (A): | Flatworms have a dorso-ventrally flattened body. |
Reason (R): | They are mostly endoparasites. |
1. | Both (A) and (R) are True and (R) correctly explains (A). |
2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
3. | (A) is True; (R) is False |
4. | Both (A) and (R) are False |
Assertion(A): | It is important that amphibian skin is without scales and is kept moist. |
Reason (R): | Amphibians respire through skin. |
1. | Both (A) and (R) are True and (R) correctly explains (A). |
2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
3. | (A) is True; (R) is False |
4. | Both (A) and (R) are False |
Assertion(A): | All chordates are not vertebrates. |
Reason (R): | All chordates do not have a notochord at any stage of their development. |
1. | Both (A) and (R) are True and (R) correctly explains (A) |
2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
3. | (A) is True; (R) is False |
4. | Both (A) and (R) are False |
1. | choanocytes | 2. | porocytes |
3. | pinacocytes | 4. | colloblasts |