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BIOLOGY [2 Mark Question Answer]

The Circulatory System · ICSE STD 6 (ICSE - English Medium). 7 questions.

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[2 Mark Question Answer]

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7 questions · timed · auto-graded

Question 12 Marks
Name the disease in which the number of platelets reduces to 25,000 – 30,000 percubic mm of blood. State its major symptoms
Answer
Dengue fever is one such disease in which the number of platelets get reduced to as low as 25-30 thousands per cubic mm of blood. The major symptoms of dengue are high fever, rashes or red spots on body, nausea or vomiting, pain in abdomen, back, or back of the eyes and muscles.
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Question 22 Marks
Differentiate between the following pair of terms: Vena Cava and Aorta
Answer
Vena Cava Aorta
Vena Cava is a large vein Aorta is the large artery.
It carries deoxygenated blood from the upper and lower parts of the body i.e. head and shoulders. It carries oxygenated blood to all parts of the body through its branches
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Question 32 Marks
Differentiate between the following pair of terms: Pulmonary artery and pulmonary vein
Answer
Pulmonary artery Pulmonary vein
This involves circulation of blood from the heart to the lungs. This involves circulation of blood to the heart from the lungs.
It carries deoxygenated blood. It carries oxygenated blood.
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Question 42 Marks
Given alongside is a diagram of human heart showing its internal structures. Label the parts marked 1 to 6, and
answer the following questions.

a.Which types of blood is carried by the blood vessel marked 2?
b.Name the main artery which takes the blood from heart to different parts of the body?
c.Which chamber of the heart receives deoxygenated blood from the body?
d.Which chamber of the heart receives oxygenated blood from the lungs?
Answer
  1. Left pulmonary artery
  2. superior vena cava
  3. Left pulmonary vein
  4. Right auricle
  5. Left auricle
  6. Left ventricle
  1. Deoxygentated blood.
  2. Aortic arch (Aorta).
  3. Right Atrium.
  4. Left Atrium
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Question 52 Marks
Why is a person having blood group AB called universal recipient and a person with blood group O called a universal donor?
Answer
People with blood group O are called universal donors because they can donate blood to all the blood groups. Their red blood cells (RBCs) have no antigens and so cannot be stuck by blood of any other group. People with blood group AB are called universal recipients because they can receive blood from all 4 blood groups. The red cells in them have no antibodies and therefore it does not stick with blood from other groups.
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Question 62 Marks
What is stethoscope? Explain.
Answer
The pulse in humans can be measured by using an instrument called stethoscope. It is a device that amplifies the sound of a heartbeat and is used to hear heartbeats in the chest.
It consists of three parts:
  1. A chest piece, which is sensitive to heartbeats.
  2. Two earpieces.
  3. A tube joining the chest piece and the earpieces
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Question 72 Marks
Describe the functions of the: Heart
Answer
The heart is a muscular organ that pumps blood to all the cells in our body through a network of blood vessels. It pumps the blood and hence helps in circulating oxygen and nutrients to all body parts. The heart pumps deoxygenated blood to the lungs and oxygenated blood to the rest of the body
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[2 Mark Question Answer] - BIOLOGY STD 6 Questions - Vidyadip