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BIOLOGY [2 Mark Question Answer]

The Circulatory System · ICSE STD 8 (ICSE - English Medium). 3 questions.

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[2 Mark Question Answer]

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Question 12 Marks
Differentiate between the following pair of terms : Vena cava and aorta.
Answer
Vena cava and Aorta
Vena Cava Aorta
$1.$ Vena Cava is a large vein. $1.$ Aorta is the large artery.
$2.$ It carries deoxygenated blood from the upper and lower parts of the body i.e. head and shoulders. $2.$ It carries oxygenated blood to all parts of the body through its branches.
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Question 22 Marks
Differentiate between the following pair of terms : Pulmonary artery and pulmonary vein.
Answer
Pulmonary artery and pulmonary vein.
Pulmonary artery Pulmonary vein
$1.$ This involves circulation of blood from the heart to the lungs. $1.$ This involves circulation of blood to the heart from the lungs.
$2.$ It carries deoxygenated blood. $2.$ It carries oxygenated blood.
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Question 32 Marks
You can see some blood vessels on the outside of the hands specially in older people. Are those veins or arteries ? How can you confirm your answer ?
Answer
In older persons the skin becomes loose as the fat below becomes less with age and the vessels passing through these areas especially on the outside of the hands become prominent. These are veins as they flow superficially. The veins are thin and less muscular. These carry the blood to the heart veins are placed superficially so they are easily visible to the eye and are prominent. The blood in the veins will be carrying $CO _2$ and will have many substances like sugar, amino acids, chemicals and bacteria.
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[2 Mark Question Answer] - BIOLOGY STD 8 Questions - Vidyadip