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Match List-I with List-II:
| List-I (Component) | List-II (Function) |
|---|---|
| A. Plasma | 1. Clotting of blood at the site of injury |
| B. Red blood corpuscles | 2. Carries digested fat from the intestine |
| C. Platelets | 3. Carries nitrogenous wastes in dissolved form |
| D. Lymph | 4. Carries oxygen with the help of haemoglobin |
Select the correct answer using the codes given below.
Consider the following events in the flow of blood through the human heart, starting with blood returning from the body:
1. The right ventricle pumps blood to the lungs.
2. De-oxygenated blood from the body enters the right atrium.
3. The left ventricle pumps blood to the whole body.
4. Oxygen-rich blood from the lungs enters the left atrium.
Select the correct sequence of these events.
Consider the following statements about blood vessels:
1. Arteries carry blood away from the heart and have thick, elastic walls.
2. Veins carry blood back to the heart and have thick walls without valves.
3. The walls of capillaries are only one cell thick.
Which of the statements given above is/are correct?
Match List-I with List-II:
| List-I (Part) | List-II (Feature) |
|---|---|
| A. Nostrils | 1. Flattened while breathing in |
| B. Throat | 2. Rings of cartilage keep the air passage open |
| C. Alveoli | 3. Fine hairs and mucus filter the air |
| D. Diaphragm | 4. Balloon-like structures where gases are exchanged |
Select the correct answer using the codes given below.
Consider the following statements:
1. In fish, blood passes through the heart only once in each cycle of circulation.
2. In the human heart, the walls of the ventricles are thicker than those of the atria.
Which of the statements given above is/are correct?
Which of the following correctly describes what happens when we breathe in?
Consider the following statements about respiration:
1. The aerobic breakdown of pyruvate takes place in the mitochondria.
2. Aerobic respiration releases much less energy than anaerobic respiration.
3. In yeast, anaerobic respiration gives carbon dioxide along with ethanol.
Which of the statements given above is/are correct?
Match List-I with List-II:
| List-I (Structure) | List-II (Role) |
|---|---|
| A. Haemoglobin | 1. Pumps de-oxygenated blood to the lungs |
| B. Valves of the heart | 2. Prevent blood from flowing backwards |
| C. Mitochondria | 3. Binds oxygen in red blood corpuscles |
| D. Right ventricle | 4. Site where pyruvate gives carbon dioxide and water |
Select the correct answer using the codes given below.
Arrange the following stages in the path of oxygen from the outside air into the blood:
1. Air passes through the throat, kept open by rings of cartilage
2. Oxygen enters the blood and is picked up by haemoglobin
3. Air is filtered by fine hairs and mucus in the nostrils
4. Air reaches the balloon-like alveoli in the lungs
Select the correct order using the codes given below.
Consider the following statements about the human heart:
1. It has two atria in the upper part and two ventricles in the lower part.
2. Oxygen-rich blood from the lungs first enters the right atrium.
3. The left ventricle pumps blood to the whole body.
Which of the statements given above is/are correct?
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