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NCERT Solutions for Class 7 Science Chapter 10 Respiration in Organisms

Here you will find NCERT Solutions for Class 7 Science Chapter 10 Respiration in Organisms will become your comprehensive guide in easy learning and evaluating yourself. These Class 7 Science NCERT Solutions will be quite helpful in making learning process and effortless and more effective. It will allow students to cover the entire syllabus effectively without any frustration.

With the help of NCERT Solutions for Class 7 Science Chapter 10, you can figure out the latest marking scheme and prepare your answers as per the demand. It will be useful in expanding student's horizon as it cover variety of questions. NCERT Solutions is an effective method for learning since you can be le to learn a lot within a short time.

NCERT Solutions for Class 7 Science Chapter 10 Respiration in Organisms


NCERT Solutions for Class 7 Science Chapter 10 Respiration in Organisms


These Chapter 10 Class 7 Science NCERT Solutions will help every students in passing exams with flying colours. Students will develop the ability to identify what improvements and changes need to be made. It will help in developing a wider body of knowledge when you’re brainstorming a solution. Detailed explanation provided under each NCERT solutions will help in understanding the concepts better.

Study Material for Class 7 Science Chapter 10 Respiration in Organisms

Page No: 118

Exercises

1. Why does an athlete breathe faster and deeper than usual after finishing the race?

Answer

During the run, the demand of energy is high but the supply of oxygen to produce energy is limited. Therefore, anaerobic respiration takes places in the muscle cells to fulfill the demand of energy. After finishing the race, an athlete breathe faster and deeper than usual so that more oxygen is supplied to the cells.

2. List the similarities and differences between aerobic and anaerobic respiration.

Answer

Similarity:
(i) In both aerobic and anaerobic respiration, food is broken down to release energy.
(ii) Both takes place inside cells.
(iii) Both produces byproducts.

Differences:

Aerobic Respiration Anaerobic Respiration
(i) It takes place in the presence of oxygen. (i) It takes place in the absence of oxygen.
(ii) Energy is released in higher amount. (ii) Energy is released in lesser amount.
(iii) Carbon dioxide and water are produced as byproducts. (iii) Carbon dioxide and water are produced as byproducts.
(iv) It is a slow process. (iv) It is a fast process.
(v) Examples: Animals and plants cells. (iv) Examples: Human cells, yeast, Bacteria etc.

3. Why do we often sneeze when we inhale a lot of dust-laden air?

Answer

We often sneeze when we inhale a lot of dust-laden air to expel out these foreign particles. These particles get past the hair in the nasal cavity and  irritate the lining of the cavity which results in sneezing.


4. Take three test-tubes. Fill each of them with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of CO2 ?

Answer

Test-tube A will have the highest concentration of CO2 because snail will take in oxygen and gives out CO2.
In test-tubes B and C, the CO2 will be utilized by the water plant for synthesizing food and hence there will be less concentration of CO2 in these.

5. Tick the correct answer:
(a) In cockroaches, air enters the body through
(i) lungs 
(ii) gills
(iii) spiracles 
(iv) skin
(iii) spiracles

(b) During heavy exercise, we get cramps in the legs due to the accumulation of
(i) carbon dioxide 
(ii) lactic acid 
(iii) alcohol
(iv) water
(ii) lactic acid

(c) Normal range of breathing rate per minute in an average adult person at rest is:
(i) 9 - 12
(ii) 15 - 18 
(iii) 21 - 24 
(iv) 30 - 33
(ii) 15 - 18

(d) During exhalation, the ribs
 (i) move outwards 
(ii) move downwards
(iii) move upwards 
(iv) do not move at all
(ii) move downwards

6. Match the items in Column I with those in Column II:

Column I Column II
(a) Yeast (i) Earthworm
(b) Diaphragm (ii) Gills
(c) Skin (iii) Alcohol
(d) Leaves (iv) Chest cavity
(e) Fish (v) Stomata
(f) Frog (vi) Lungs and skin
- (vii) Tracheae

Answer

Column I Column II
(a) Yeast (iii) Alcohol
(b) Diaphragm (iv) Chest cavity
(c) Skin (i) Earthworm
(d) Leaves (v) Stomata
(e) Fish (ii) Gills
(f) Frog (vi) Lungs and skin

Page No: 119

7. Mark T if the statement is true and F if it is false:
(i) During heavy exercise the breathing rate of a person slows down. (T/ F)
(ii) Plants carry out photosynthesis only during the day and respiration only at night. (T/ F)
(iii) Frogs breathe through their skins as well as their lungs. (T/ F)
(iv) The fishes have lungs for respiration. (T/ F)
(v) The size of the chest cavity increases during inhalation. (T/ F)


Answer

(i) F
(ii) F
(iii) T
(iv) F
(v) T

8. Given below is a square of letters in which are hidden different words related to respiration in organisms. These words may be present in any direction - upwards, downwards, or along the diagonals. Find the words for your respiratory system. Clues about those words are given below the square.
(i) The air tubes of insects
(ii) Skeletal structures surrounding chest cavity
(iii) Muscular floor of chest cavity
(iv) Tiny pores on the surface of leaf
(v) Small openings on the sides of the body of an insect
(vi) The respiratory organs of human beings
(vii) The openings through which we inhale
(viii) An anaerobic organism
(ix) An organism with tracheal system


Answer


(i) The air tubes of insects → Trachea
(ii) Skeletal structures surrounding chest cavity → Ribs
(iii) Muscular floor of chest cavity → Diaphragm
(iv) Tiny pores on the surface of leaf → Stomata
(v) Small openings on the sides of the body of an insect → Spiracles
(vi) The respiratory organs of human beings → Lungs
(vii) The openings through which we inhale → Nostrils
(viii) An anaerobic organism → Yeast
(ix) An organism with tracheal system → Ant

9. The mountaineers carry oxygen with them because:
(a) At an altitude of more than 5 km there is no air.

(b) The amount of air available to a person is less than that available on the ground.
(c) The temperature of air is higher than that on the ground.
(d) The pressure of air is higher than that on the ground.


Answer

The mountaineers carry oxygen with them because (b) The amount of air available to a person is less than that available on the ground.


Chapter 10 Respiration in Organisms Class 7 Science NCERT Solutions


NCERT Solutions for Class 7 Science given here will provide you a better guidance through which you can pass with flying colours. You can kick up your preparation with these Class 7 Science NCERT Solutions. These will help you in building basic skills through which you can prepare yourselves for exams.

Class 7 Science Chapter 10 Respiration in Organisms NCERT Questions and Answers - Topics


• Why Do We Respire?
• Breathing
• How Do We Breathe?
• What Do We Breathe Out?
• Breathing In Other Animals
• Breathing Under Water
• Do Plants Also Respire?

Class 7 Science Chapter 10 Respiration in Organisms NCERT Questions and Answers - Notes


• Respiration is necessary for survival for the living beings.

• The process of breakdown of food in the cell with the release of energy is called cellular respiration. Cellular respiration takes place in the cells of all organisms.

• When breakdown of glucose occurs with the use of oxygen it is called aerobic respiration. Food can also be broken down, without using oxygen. This is called anaerobic respiration.

• There are some organisms such as yeast that can survive in the absence of air. They are called anaerobes. They get energy through anaerobic respiration.

• Breathing means taking in air rich in oxygen and giving out air rich in carbon dioxide with the help of respiratory organs. The taking in of air rich in oxygen into the body is called inhalation and giving out of air rich in carbon dioxide is known as exhalation. It is a continuous process which goes on all the time and throughout the life of an organism.

→ The number of times a person breathes in a minute is termed as the breathing rate.

• The mechanism of breathing:
→ When we inhale air, it passes through our nostrils into the nasal cavity.
→ From the nasal cavity, the air reaches our lungs through the windpipe. Lungs are present in the chest cavity. This cavity is surrounded by ribs on the sides.
→ A large, muscular sheet called diaphragm forms the floor of the chest cavity. Breathing involves the movement of the diaphragm and the rib cage.

• A cockroach has small openings on the sides of its body. These openings are called spiracles. Insects have a network of air tubes called tracheae for gas exchange.

→ The skin of an earthworm feels moist and slimy on touching. Gases can easily pass through them.

• The gills in fish help them to use oxygen dissolved in water. Gills are well supplied with blood vessels for exchange of gases.

• Like all other living cells of the plants, the root cells also need oxygen to generate energy. Roots take up air from the air spaces present between the soil particles.

Chapter 10 Respiration in Organisms Class 7 Science Questions and Answers - MCQ Questions with answers


1. During exhalation, the ribs move
(a) Outwards
(b) Downwards
(c) Upwards
(d) To normal position
► (b) Downwards

2. Alcohol is obtained by anaerobic fermentation of
(a) Fat
(b) Minerals
(c) Protein
(d) Sugar
► (d) Sugar

3. Blood is red coloured due to presence of
(a) Leucoplast
(b) Haemoglobin
(c) Plastids
(d) Chloroplast
► (b) Haemoglobin

4. Oxidation of food inside cell takes place in
(a) Golgi bodies
(b) Mitochondria
(c) Chromosome
(d) Ribosome
► (b) Mitochondria

5. What is the function of the hair in the nose?
(a) To secrete mucus.
(b) To trap dust particles.
(c) To protect the mucus glands.
(d) To prevent germs from entering the lungs.
► (b) To trap dust particles.

6. In plants, exchange of gases takes place through
(a) Guard cells
(b) Epidermis
(c) Stomata
(d) Accessories cells
► (c) Stomata

7. What will happen when diaphragm relaxes and curves upwards?
(a) Air is forced out of the lungs.
(b) The rib cage goes up and outward.
(c) The volume of the thoracic cavity increases.
(d) Air pressure inside the thoracic cavity decreases.
► (a) Air is forced out of the lungs.

8. Why do we get, muscle cramps after heavy exercise?
(a) It is due to the partial breakdown of glucose to produce lactic acid.
(b) It is due to the complete breakdown of glucose to produce lactic acid.
(c) It is due to the muscle cells that respire in the presence of oxygen.
(d) It is due to the increased supply of oxygen to muscle cells.
► (a) It is due to the partial breakdown of glucose to produce lactic acid.

9. Small thin walled balloon like structure that help in exchange of gases are
(a) Arteries
(b) Veins
(c) Stomata
(d) Alveoli
► (d) Alveoli

10. Haemoglobin carries oxygen molecules as
(a) Carboxy-pigment.
(b) Carboxyhaemoglobin
(c) Oxyhaemoglobin
(d) Chloroplast
► (c) Oxyhaemoglobin

NCERT Solutions for Class 7 Science Chapter 10 that is useful in completing homework in time and passing exams with flying colours. Your marks play an important role in shaping future thus these NCERT Solutions for Science will become your comprehensive guide in easy learning and evaluating yourself. You will get step by step and to the points answers of every question given inside the textbook.


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