Kerala SCERT Class 7 Science Chapter 8 Breath and Blood of Life Question Answer Solution Here. Kerala Board Class 7 Students can find Here 8th Chapter Breath and Blood of Life Notes provide by our Teacher. Important Question Answer from Chapter 8 Breath and Blood of Life.
- Board- Kerala Board.
- Class – 7.
- Subject – Science Part 2
- Chapter – 8.
- Chapter Name – Breath and Blood of Life.
- Topic – Question Answer Solution.
Multiple choice questions.
(1) We breathe about —- times in a day
a)18000
b)19000
c)20000
d)21000
(2)The process of inhaling air is
a) Inspiration
b) expiration
c) both
d) none
(3) The process of exhaling air is
a)Inspiration
b)expiration
c)both
d) none
(4) While inhaling ,ribs gets
a) Expands
b) contracts
c) both
d) none
(5) While exhaling, ribs gets
a) Expands
b) contracts
c) both
d) none
6) Respiratory system in humans involves
(a) Nostrils
(b)Trachea
(c) Bronchi
(d) Lungs
(e) All the above.
(7) In inhaled air, the % of gases are
a) Oxygen 21%
b) Carbon dioxide 0.04%
c) Nitrogen 78%
d) Water vapour 0.96%
e) All the above.
(8) In Exhaled air, the % of gases are
a) Oxygen 15%
b) Carbon dioxide 4%
c) Nitrogen 78%
d) Water vapour 3%
e)All the above.
(9) When carbon dioxide is passed through clear lime water, its colour changes into
a)blue
b)red
c)milky
d)none.
(10) The respiratory organ of the earthworm is
a) lungs
b) moist skin
c) both
d) none
(11) respiratory organ of fish is
a) lungs
b)moist skin
c)gills
d)none.
(12) ) Respiratory organ of amphibian is
a) lungs
b) moist skin
c) both
d) none.
(13) The rate of respiration in plants is—- compared to animals.
a)more
b)less
c)both
d)none.
(14) Blood is composed of cells
a) red blood cells
b) white blood cells
c) platelets
d) plasma.
e) All the above.
(15) The blood circulatory system includes
a) the heart
b) blood vessels
c) blood
d) all the above.
(16) Three kinds of blood vessels are
a) arteries
b) veins
c) capillaries
d)All the above.
(17) The heart normally beats — times per minute
a)70
b)71
c)72
d)73
Questions and answers.
(1) Which main respiratory organ in human beings?
ANS: A pair of lungs is the main respiratory organ in human beings.
(2) What is the size of lungs?
ANS: The right lung is slightly larger than the left lung.
(3) What is diaphragm?
ANS: The expansion and contraction of the lungs is made possible by a layer of muscles at the base of the thorax called diaphragm.
(4) What is lime water?
ANS: Lime water is calcium hydroxide.
(5) What is respiration?
ANS: Respiration is the process by which organisms take in oxygen from the surroundings and release carbon dioxide.
(6) Why human blood red in colour?
ANS: presence of a pigment in blood called haemoglobin.
(7) Which organism has red sweat?
ANS:The hippopotamus
Short questions and answers.
(1) Write down heart chambers present in different organisms?
ANS:
i) earthworm- Five pairs of lateral heart
ii) fish- Two chambered heart
iii) reptiles- Three chambered heart
iv) cockroach- Thirteen chambered heart
vi) mammals- Four chambered heart
This is nice for students but give answers to multiple choice questions also
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This site really helpful for students