NCERT Class VII Science Solutions: Chapter 10-Respiration in Organisms Part 3 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 6:

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

Match Column 1 and Column 2
Column IColumn II
YeastEarthworm
DiaphragmGills
SkinAlcohol
LeavesChest cavity
FishStomata
FrogLungs and skin
Tracheae

Answer:

Column 1 and Column 2 Matched
Column IColumn II
YeastAlcohol
DiaphragmChest cavity
SkinEarthworm
LeavesStomata
FishGills
FrogLungs and skin

Question 7:

Mark ‘T’ if the statement is true and ‘F’ if it is false:

  1. During heavy exercise the breathing rate of a person slows down. (T/F)
  2. Plants carry out photosynthesis only during the day and respiration only at night. (T/F)
  3. Frogs breathe through their skins as well as their lungs. (T/F)
  4. The fishes have lungs for respiration. (T/F)
  5. The size of the chest cavity increases during inhalation. (T/F)

Answer:

  1. During heavy exercise the breathing rate of a person slows down. (False)
  2. Plants carry out photosynthesis only during the day and respiration only at night. (False)
  3. Frogs breathe through their skins as well as their lungs. (True)
  4. The fishes have lungs for respiration. (False)
  5. The size of the chest cavity increases during inhalation. (True)

Question 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.

As Showing in Images is a Crossword Puzzle
  1. The air tubes of insects
  2. Skeletal structures surrounding chest cavity
  3. Muscular floor of chest cavity
  4. Tiny pores on the surface of leaf
  5. Small openings on the sides of the body of an insect
  6. The respiratory organs of human beings
  7. The openings through which we inhale
  8. An anaerobic organism
  9. An organism with tracheal system
As Showing in Images is a Crossword Puzzle

Answer:

  1. The air tubes of insects – Trachea
  2. Skeletal structures surrounding chest cavity – Ribs
  3. Muscular floor of chest cavity – Diaphragm
  4. Tiny pores on the surface of leaf – Stomata
  5. Small openings on the sides of the body of an insect – Spiracles
  6. The respiratory organs of human beings – Lungs
  7. The openings through which we inhale – Nostrils
  8. An anaerobic organism – Yeast
  9. An organism with tracheal system – Ant

Question 9:

The mountaineers carry oxygen with them because:

  1. At an altitude of more than 5 km there is no air.
  2. The amount of air available to a person is less than that available on the ground.
  3. The temperature of air is higher than that on the ground.
  4. The pressure of air is higher than that on the ground.

Answer: B

Air is everywhere, in water, soil surroundings, moving air is wind.

Air occupy space has no color, is transparent. Thin layer of air surrounding earth: Atmosphere.

The amount of air available to a person is less than that available on the ground.

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