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By Savita S. More

Class 7 Respiration in Organisms

Last updated on August 30th, 2023 at 01:02 am

 

(d) During exhalation, the ribs

(i) move outwards

(ii) move downwards [Correct Answer]

(iii)move upwards

(iv) do not move at all

 

QUE.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  [a]
(d) Leaves (iv) Chest cavity
(e) Fish (v) Stomata
(f) Frog (vi) Lungs and skin

QUE.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)

 Ans:-

  1. False
  2. False
  3. True
  4. False
  5. True

 

QUE.8 :Given below is a sQue.uare 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. 

 

(i) The air tubes of insects –  Trachea

(ii) Skeletal structures surrounding chest cavity – Ribs

(iii) Muscular floor of chest cavity – 

(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 – Insects

 

QUE.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. [Correct Answer]

(c) The temperature of air is higher than that on the ground.

(d) The pressure of air is higher than that on the ground.

important points to remember

  1. Respiration is the process of releasing energy from food
  2. When we breathe, we take in oxygen (from the air), use it for releasing energy by burning food, and then eliminate the waste products (carbon dioxide and water) from our bodies.
  3. Respiration is the opposite of photosynthesis.
  4. A process by which food is broken down in cells of the body to release energy is called respiration.
  5. The breakdown of glucose occurs with oxygen use, which is called aerobic respiration.
  6. A method of breaking down glucose (food) in the absence of oxygen is called anaerobic respiration.
  7. The yeast is a single-celled organism.
  8. Yeast turns glucose into alcohol
  9. Muscle cramps are caused by an accumulation of lactic acid in the muscles.
  10. An organism breathes when it takes in oxygen-rich air from the environment and expels carbon dioxide-rich air from the body (using breathing organs).
  11. The breathing rate is the number of times a person breathes in one minute.
  12. Humans breathe on average 15 to 18 times per minute at rest.
  13. According to the body’s oxygen requirements, breathing rate changes
  14. Physical exercise can increase an adult human’s breathing rate by up to 25 times per minute (or more).
  15. A person breathes faster when he needs extra energy.
  16. During breathing, the diaphragm and rib cage move together.
  17. Human respiratory system consists of: Nose, Nasal passages , Trachea, Bronchi, Lungs, and Diaphragm.
  18. Gases are exchanged between the air and blood across the walls of the alveoli
  19. All parts of the body receive oxygen through the blood. A red pigment called haemoglobin is responsible for carrying oxygen in red blood cells.
  20. Insufficient oxygen in the body causes yawning.
  21. Earthworms breathe through their skin
  22. Dolphins and whales live in water, but do not have gills.
  23. Whales and dolphins breathe in through their nostrils (called blowholes), which are located on the tops of their heads.
  24. All insects breathe through tiny holes (called spiracles) and thin tubes (called tracheae).

 

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