C. Long Answer Type Questions:
1.a. Draw a sectional view of the human heart and label
on it:
Pulmonary artery , Left Atrium (Auricle),Vena cava,
left ventricle, Aorta , Pulmonary vein.
b. Justify the statement that blood circulation in fish is
different from the blood circulation in human beings?
2.a. Draw a labelled diagram of Human excretory
system and label the following parts on it:
Kidney , Ureter , Urinary bladder , Urethra
b. Write one function each of the labelled parts.
3. There is a difference in the rate of breathing between
aquatic organisms and terrestrial organisms.Why?
Explain.
Answers
Answer:
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Explanation:
1(a). Refer to image attached...
(b)In mammals (like us) there is a double circulation. The right side of the heart receives blood returning back from the body; this blood is low in oxygen (blue in the figure to the right). In fish, the heart only has one atrium and one ventricle. Refer to image attached for reference.
2(a) Refer to image attached...
(b)Kidneys are a natural filter of the blood, designed to remove impurities. The ureters carry urine from the kidneys to the urinary bladder. The urinary bladder stores urine, while the Sphincter muscle holds it closed until the person decides to go to the toilet. The urethra carries urine to the outside of the body.
3. Aquatic animals breathe at a faster rate than the terrestrial animals because the amount of dissolved oxygen in water is fairly low compared to the amount of oxygen in the air. To meet the oxygen need aquatic animals breathe faster to intake more oxygen.
