Respiration in Organisms - Class 7 - Science
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Back Questions - Respiration in Organisms | NCERT | Science | Class 7
Why does an athlete breathe faster and deeper than usual after finishing the race?
An athlete breathes faster and deeper after a race due to increased oxygen demand by muscles for recovery. During intense exercise, muscles perform anaerobic respiration, producing lactic acid and leading to an oxygen deficit. Breathing faster and deeper, known as excess post-exercise oxygen consumption (EPOC), helps clear lactic acid and replenishes oxygen stores, aiding in energy production and muscle recovery. This adjustment speeds up the removal of carbon dioxide and other metabolic wastes.
List the similarities and differences between aerobic and anaerobic respiration.
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Sign up nowWhy do we often sneeze when we inhale a lot of dust-laden air?
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Sign up nowTake three test tubes. Fill $3 / 4$ th of each 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 the snail and plant both. Which test tube would have the highest concentration of $\mathrm{CO}_{2}$ ?
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Sign up nowIn cockroaches, air enters the body through
(i) lungs
(ii) gills
(iii) spiracles
(iv) skin
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Sign up nowDuring heavy exercise, we get cramps in the legs due to the accumulation of
(i) carbon dioxide
(ii) lactic acid
(iii) alcohol
(iv) water
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Sign up nowNormal range of breathing rate per minute in an average adult person at rest is:
(i) 9-12
(ii) $15-18$
(iii) 21-24
(iv) $30-33$
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Sign up nowDuring exhalation, the ribs
(i) move outwards
(ii) move downwards
(iii) move upwards
(iv) do not move at all
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Sign up nowMatch 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 |
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Sign up nowMark ' $T$ ' if the statement is true and ' $F$ ' if it is false:
During heavy exercise the breathing rate of a person slows down. (T/F)
Plants carry out photosynthesis only during the day and respiration only at night. (T/F)
Frogs breathe through their skins as well as their lungs. (T/F)
The fishes have lungs for respiration. (T/F)
The size of the chest cavity increases during inhalation. (T/F)
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Sign up nowGiven 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.
S | V | M | P | L | U | N | G | S |
---|---|---|---|---|---|---|---|---|
C | Z | G | Q | W | X | N | T | L |
R | M | A | T | I | D | O | T | C |
I | Y | R | X | Y | M | S | R | A |
B | R | H | I | A | N | T | A | Y |
S | T | P | T | B | Z | R | C | E |
M | I | A | M | T | S | I | H | A |
S | P | I | R | A | C | L | E | S |
N | E | D | K | J | N | S | A | T |
(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
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Sign up nowThe mountaineers carry oxygen with them because:
(a) At an altitude of more than $5 \mathrm{~km}$ 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.
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Sign up nowObserve fish in an aquarium. You will find flap like structures on both sides of their heads. These are flaps which cover the gills. These flaps open and close alternately. On the basis of these observations, explain the process of respiration in the fish.
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Sign up nowVisit a local doctor. Learn about the harmful effects of smoking. You can also collect material on this topic from other sources. You can seek help of your teacher or parents. Find out the percentage of people of your area who smoke. If you have a smoker in your family, confront him with the material that you have collected.
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Sign up nowVisit a doctor. Find out about artificial respiration. Ask the doctor:
(a) When does a person need artificial respiration?
(b) Does the person need to be kept on artificial respiration temporarily or permanently?
(c) From where can the person get supply of oxygen for artificial respiration?
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Sign up nowMeasure the breathing rate of the members of your family and some of your friends. Investigate:
(a) If the breathing rate of children is different from that of adults.
(b) If the breathing rate of males is different from that of females.
If there is a difference in any of these cases, try to find the reason.
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Sign up nowExtra Questions - Respiration in Organisms | NCERT | Science | Class 7
Plants take in carbon dioxide and give out oxygen during respiration.
A) I & III only
B) II & IV only
The correct option is B
II & IV only
Plants actually take in carbon dioxide and give out oxygen only during photosynthesis. Contrary to the common misconception mentioned in the question, during respiration, plants take in oxygen and release carbon dioxide, similar to animals.
Which of the following is the end product in the case of anaerobic respiration in yeast?
A) Water
B) Lactic acid
C) Pyruvate
D) Ethanol
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Sign up nowIn organisms like yeast, food is broken down in the absence of oxygen to produce:
A) alcohol and lactic acid
B) ethyl alcohol and $\mathrm{CO}_{2}$
C) lactic acid and $\mathrm{CO}_{2}$
D) lactic acid only
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