I: | is released out as the blood passes through the capillaries in tissues leaving the larger proteins and most of the formed elements in the blood vessels. |
II: | has nearly the same mineral distribution as that in plasma. |
Assertion (A): | Open circulatory system is considered to be more advantageous than the closed circulatory system. |
Reason (R): | Open circulatory system is present in arthropods and molluscs, two of the most successful animal phyla. |
1. | Both (A) and (R) are True and (R) correctly explains (A). |
2. | (A) is True but (R) is False. |
3. | Both (A) and (R) are True but (R) does not correctly explain (A). |
4. | (A) is False but (R) is True. |
I: | Fishes have a 2-chambered heart with an atrium and a ventricle. |
II: | Amphibians and the reptiles (except crocodiles) have a 3-chambered heart with two atria and a single ventricle. |
III: | Crocodiles, birds and mammals possess a 4-chambered heart with two atria and two ventricles. |
IV: | The only vertebrates where the heart pumps out deoxygenated blood are fishes. |
1. | 1 | 2. | 2 |
3. | 3 | 4. | 4 |
I: | The opening between the right atrium and the right ventricle is guarded by the tricuspid valve. |
II: | A bicuspid or mitral valve guards the opening between the left atrium and the left ventricle. |
III: | The openings of the right and the left ventricles into the pulmonary artery and the aorta respectively are provided with the semilunar valves. |
I: | closure of semilunar valves occurs. |
II: | the tricuspid and bicuspid valves are pushed open. |