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)
During heavy exercise, the breathing rate of a person slows down. (T/F)
During exhalation, the ribs
In cockroaches, air enters the body through
During heavy exercise, we get cramps in the legs due to the accumulation of
Normal range of breathing rate per minute in an average adult person at rest is
Plants carry out photosynthesis only during the day and respiration only at night. (T/F)
Match structures given in Column I with functions given in Column II.
Q1) Why does an athlete breathe faster and deeper than usual after finishing the race?
Why does an athlete breathe faster and deeper than usual after finishing the race?
Fill in the blanks.
(i) The blood from the heart is transported to all parts of the body by the .
(ii) Haemoglobin is present in cells.
(iii) Arteries and veins are joined by a network of .
(iv) The rhythmic expansion and contraction of the heart is called
(v) The main excretory product in human beings is .
(vi) Sweat contains water and .
(vii) Kidneys eliminate the waste materials in the liquid form called .
(viii) Water reaches great heights in the trees because of suction pull caused by .
Q2) List the similarities and differences between aerobic and anaerobic respiration.
List the similarities and differences between aerobic and anaerobic respiration.
Q3) Why do we often sneeze when we inhale a lot of dust-laden air?
Why do we often sneeze when we inhale a lot of dust-laden air?
Choose the correct option:
(a) In plants, water is transported through
(i) xylem
(ii) phloem
(iii) stomata
(iv) root hair
(b) Water absorption through roots can be increased by keeping the plants
(i) in the shade
(ii) in dim light
(iii) under the fan
(iv) covered with a polythene bag
Why is transport of materials necessary in a plant or in an animal? Explain.
Q4) Take three test-tubes. Fill ¾th 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 snail and plant both. Which test-tube would have the highest concentration of CO2?
Take three test-tubes. Fill ¾th 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 snail and plant both. Which test-tube would have the highest concentration of CO2 ?
Q5) Tick the correct answer:
(a) In cockroaches, air enters the body through
(i) lungs (ii) gills
(iii) spiracles (iv) skin
(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
(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
(d) During exhalation, the ribs
(i) move outwards (ii) move downwards
(iii) move upwards (iv) do not move at all
Tick the correct answer:
(i) lungs (ii) gills (iii) spiracles (iv) skin
(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
(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
(i) move outwards (ii) move downwards (iii) move upwards (iv) do not move at all v
What will happen if there are no platelets in the blood?
What are stomata? Give two functions of stomata.
Q6) Match the items in Column I with those in Column II:
Match the items in Column I with those in Column II:
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)
Does transpiration serve any useful function in the plants? Explain.
Q7) Mark ‘T’ if the statement is true and ‘F’ if it is false:
Q8) 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.
ART
(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
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.
What are the components of blood?
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.
Q9) The mountaineers carry oxygen with them because:
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