NCERT Solutions Class 7th Science Chapter – 6 Respiration in Animals and Plants Question & Answer

NCERT Solutions Class 7th Science Chapter – 6 Respiration in Animals and Plants

TextbookNCERT
Class 7th
Subject Science
Chapter6th
Chapter NameRespiration in Animals and Plants
CategoryClass 7th Science
Medium English
SourceLast Doubt
NCERT Solutions Class 7th Science Chapter – 6 Respiration in Animals and Plants Question & Answer What are characteristics of respiration?, What type of reaction is respiration?, What is respiration PDF?, Why is respiration important?, What is respiration in biology?, Why is respiration important in plants?, What are the 5 types of respiration?, What is the introduction of respiration?, Where does respiration occur?

NCERT Solutions Class 7th Science Chapter – 6 Respiration in Animals and Plants

Chapter – 6

Respiration in Animals and Plants

Question & Answer

Q. 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.
Q. 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 by produce.(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. (v) Examples: Human cells, yeast, Bacteria etc.
Q. 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.
Q. 4. Take three test-tubes. Fill ¾th 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 test-tube A will have Snail which expels out CO2 into the tube. Since a plant is present in both test tubes B and C, the plant will inhale CO2 to decrease CO2 concentration. Thus, there will be less concentration of CO2 in these tubes.
Q. 5. Tick the correct answer:
(a) In cockroaches, air enters the body through
(i) lungs
(ii) gills
(iii) spiracles
(iv) skin
Answer – (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
Answer – (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
Answer – (ii) 15 – 18


(d) During exhalation, the ribs
(i) move outwards
(ii) move downwards
(iii) move upwards
(iv) do not move at all
Answer – (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) 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
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)
(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
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.
SVMPLUNGS
CZGQWXNTL
RMATIDOYC
IYRXYMSRA
BRHIANTAY
STPTBZRCE
MIAMTSIHA
SPIRACLES
NEDKJNSAT

(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

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.
Answer – (b) The amount of air available to a person is less than that available on the ground.
NCERT Solution Class 7th Science All Chapters Question Answer
Chapter – 1 Nutrition in Plants
Chapter – 2 Nutrition in Animals
Chapter – 3 Heat
Chapter – 4 Acids, Bases and Salts
Chapter – 5 Physical and Chemical Changes
Chapter – 6 Respiration in Organisms
Chapter – 7 Transportation in Animals and Plants
Chapter – 8 Reproduction in Plants
Chapter – 9 Motion and Time
Chapter – 10 Electric Current and Its Effects
Chapter – 11 Light
Chapter – 12 Forests: Our Lifelin
Chapter – 13 Wastewater Story
NCERT Solution Class 7th Science All Chapters Notes
Chapter – 1 Nutrition in Plants
Chapter – 2 Nutrition in Animals
Chapter – 3 Heat
Chapter – 4 Acids, Bases and Salts
Chapter – 5 Physical and Chemical Changes
Chapter – 6 Respiration in Organisms
Chapter – 7 Transportation in Animals and Plants
Chapter – 8 Reproduction in Plants
Chapter – 9 Motion and Time
Chapter – 10 Electric Current and Its Effects
Chapter – 11 Light
Chapter – 12 Forests: Our Lifeline
Chapter – 13 Wastewater Story

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