Biology
Class 10
Lakhmir Singh
1
Chapter 1: Life Processes
281 questions
Q1
Question 73:
Which blood vessel does not carry any carbon dioxide?
(a) pulmonary artery
(b) vena cava
(c) hepatic vein
(d) pulmonary vein
(a) pulmonary artery
(b) vena cava
(c) hepatic vein
(d) pulmonary vein
Q2
Question 74:
It has been found that people living in very high mountains have many more red corpuscles in their blood than people living in plains. Which one of the following best accounts for this phenomenon?
(a) the cold climate stimulates the production of red corpuscles to keep the body warm
(b) people of high mountains breathe more quickly
(c) the low air pressure requires more red corpuscles to supply the body cells with oxygen.
(d) the low air pressure in high mountains speeds up the blood circulation so that more red corpuscles are needed
(a) the cold climate stimulates the production of red corpuscles to keep the body warm
(b) people of high mountains breathe more quickly
(c) the low air pressure requires more red corpuscles to supply the body cells with oxygen.
(d) the low air pressure in high mountains speeds up the blood circulation so that more red corpuscles are needed
Q3
Question 75:
The phloem tissue in plants is responsible for the transport of:
(a) water
(b) water and minerals
(c) sugar
(d) all of the above
View all question(a) water
(b) water and minerals
(c) sugar
(d) all of the above
2
Chapter 2: Control and Coordination
182 questions
3
Chapter 3: How do Organism Reproduce?
183 questions
4
Chapter 4: Heredity and Evolution
150 questions
5
Chapter 5: Our Environment
141 questions
6
Chapter 6: Management of Natural Resources
70 questions
Question
Question 74:
It has been found that people living in very high mountains have many more red corpuscles in their blood than people living in plains. Which one of the following best accounts for this phenomenon?
(a) the cold climate stimulates the production of red corpuscles to keep the body warm
(b) people of high mountains breathe more quickly
(c) the low air pressure requires more red corpuscles to supply the body cells with oxygen.
(d) the low air pressure in high mountains speeds up the blood circulation so that more red corpuscles are needed
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Answer:
(c) the low air pressure requires more red corpuscles to supply the body cells with oxygen.
At high altitude, the atmospheric pressure of oxygen is low. As a result, the number of red blood cells in the body cannot meet the cell's demands for oxygen. Therefore, the body increases its red blood cell count in order to supply more oxygen to the body cells, even with less oxygen in the atmosphere. Hence, people living on very high mountains have more red corpuscles in their blood than those living in plains.
At high altitude, the atmospheric pressure of oxygen is low. As a result, the number of red blood cells in the body cannot meet the cell's demands for oxygen. Therefore, the body increases its red blood cell count in order to supply more oxygen to the body cells, even with less oxygen in the atmosphere. Hence, people living on very high mountains have more red corpuscles in their blood than those living in plains.
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Practice more questions from Biology (Lakhmir Singh)
Q1
Question 73:
Which blood vessel does not carry any carbon dioxide?
(a) pulmonary artery
(b) vena cava
(c) hepatic vein
(d) pulmonary vein
(a) pulmonary artery
(b) vena cava
(c) hepatic vein
(d) pulmonary vein
Q2
Question 74:
It has been found that people living in very high mountains have many more red corpuscles in their blood than people living in plains. Which one of the following best accounts for this phenomenon?
(a) the cold climate stimulates the production of red corpuscles to keep the body warm
(b) people of high mountains breathe more quickly
(c) the low air pressure requires more red corpuscles to supply the body cells with oxygen.
(d) the low air pressure in high mountains speeds up the blood circulation so that more red corpuscles are needed
(a) the cold climate stimulates the production of red corpuscles to keep the body warm
(b) people of high mountains breathe more quickly
(c) the low air pressure requires more red corpuscles to supply the body cells with oxygen.
(d) the low air pressure in high mountains speeds up the blood circulation so that more red corpuscles are needed
Q3
Question 75:
The phloem tissue in plants is responsible for the transport of:
(a) water
(b) water and minerals
(c) sugar
(d) all of the above
View all(a) water
(b) water and minerals
(c) sugar
(d) all of the above
Practice questions from Biology (Lakhmir Singh)
Question 1
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(a) What is (i) gland A (ii) substance B, and (iii) enzyme C?
(b) Name the tube D.
(c) What is the movement E known as?
(d) What are (i) F (ii) G, and (iii) H?
Question 2
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(i) pyruvate can be converted into ethanol and carbon dioxide by yeast
(ii) fermentation takes place in the case of aerobic bacteria
(iii) fermentation takes place in mitochondria
(iv) fermentation is a form of anaerobic respiration
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(b) (ii) and (iv)
(c) (i) and (iv)
(d) (ii) and (iii)
Question 3
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(a) Some organisms store wastes in body parts.
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| Question Text |
Question 74:
It has been found that people living in very high mountains have many more red corpuscles in their blood than people living in plains. Which one of the following best accounts for this phenomenon? (a) the cold climate stimulates the production of red corpuscles to keep the body warm (b) people of high mountains breathe more quickly (c) the low air pressure requires more red corpuscles to supply the body cells with oxygen. (d) the low air pressure in high mountains speeds up the blood circulation so that more red corpuscles are needed |
| Updated On | Sep 22, 2022 |
| Topic | Life Processes |
| Subject | Science |
| Class | Class 10 |
| Answer Type | Text solution:1 Video solution: 2 |
| Upvotes | 196 |
| Avg. Video Duration | 3 min |
