SEBA Class 7 Science Chapter 2 Respiration in Organisms – Textbook Solutions & MCQ (Part II)
Find Class 7 Science Chapter 2 “Respiration in Organisms” Solutions for SEBA Assam (English Medium) students. This chapter, from Part II of the Science book, explains the process of respiration in different organisms, including humans, plants, and animals. It covers aerobic and anaerobic respiration, the role of oxygen, and the importance of breathing. Our solutions provide detailed textbook answers, multiple-choice questions (MCQs), and in-depth explanations, helping students understand how cells obtain energy and the differences between various respiratory processes. These solutions are designed to enhance learning and exam preparation.
Class 7 Science
Chapter – 2 (Part II) Ospin Academy
Respiration in Organisms
EXERCISE
Q. 1. Why does an athlete breathe faster and deeper than usual after finishing the race?
Ans: During the race, the athlete has to run very fast. The demand for energy at that time increases, which increase the demand for more supply of oxygen. So, athlete has to breathe faster and deep to inhale more oxygen.
Q. 2. List the similarities and differen- ces between aerobic and anaerobic respiration.
Ans: Differences between aerobic and anaerobic respiration:
|
Aerobic Respiration |
Anaerobic Respiration |
|---|---|
|
1. It occurs in the presence of oxygen. |
1. It occurs in the absence of oxygen. |
|
2. Food molecules are broken down into water and carbon dioxide. |
2. Food molecules are broken down into ethyl alcohol and carbon dioxide. |
|
3. Large amount of energy is released. |
3. Small amount of energy is released. |
Similarities: Both aerobic and anaerobic respiration produce energy and give out carbon dioxide.
Q. 3. Why do we often sneeze when we inhale a lot of dust-laden air?
Ans: We sneeze to get rid of the unwanted particles like dust etc., from our body. It allows only clean and dust free air to enter our body.
Q.4. Take three test-tubes. Fill 3/4th of each tube with water. Label them A, B and C. Keep a snail in a 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,?
Ans: There will be highest concentration of CO2 in tube A.
Q. 5. Tick the correct answer:
(a) In cockroaches, air enters the body through:
(i) Lungs
(ii) Gills
(iii) Spiracles
(iv) Skin
Ans: (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
Ans: (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
Ans: (ii) 15-18.
(d) During exhalation the ribs:
(i) move outwards
(ii) move downwards
(iii) move upwards
(iv) do not move at all
Ans: (d) (ii) Move downwards.
Q. 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) Trachea |
Ans:
|
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 |
Q. 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)
Ans: False.
(ii) Plants carry out photosynthesis only during the day and respiration only at night. (T/F)
Ans: False.
(iii) Frogs breathe through their skins as well as their lungs. (T/F)
Ans: True.
(iv) The fishes have lungs for respiration. (T/F)
Ans: False.
(v) The size of the chest cavity increases during inhalation. (T/F)
Ans: True.
Q. 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.
Ans: Trachea.
(ii) Skeletal structures surrounding chest cavity.
Ans: Ribs.
(iii) Muscular floor of chest cavity.
Ans: Diaphragm.
(iv) Tiny pores on the surface of leaf.
Ans: Stomata.
(v) Small openings on the sides of body of an insect.
Ans: Spiracles.
(vi) The respiratory organs of human beings.
Ans: Lungs.
(vii) The openings through which we inhale.
Ans: Nost- rils.
(viii) An anaerobic organism.
Ans: Yeast.
(ix) An organism with tracheal system.
Ans: Ant.
Q. 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.
Ans: (b) The amount of air available to a person is less than that available on the ground.
Q1: What is respiration in organisms?
Respiration is the biological process through which organisms break down food to release energy in the presence or absence of oxygen.
Q2: What is the difference between aerobic and anaerobic respiration?
Aerobic respiration occurs in the presence of oxygen and produces more energy, while anaerobic respiration happens without oxygen, releasing less energy.
Q3: How do plants respire?
Plants respire through stomata in leaves and lenticels in stems, taking in oxygen and releasing carbon dioxide.
Q4: Where can I find Class 7 Science Chapter 2 solutions for SEBA Assam?
You can find detailed textbook solutions, MCQs, and explanations for SEBA Assam Class 7 Science Chapter 2 (Part II) on this page.
Q5: Where can I find solutions for all Class 7 Science chapters?
To get solutions for all Class 7 Science chapters, Click Here
