2 Gaseous exchange; oxygen; carbon dioxide
3 lungs
4 carbon dioxide; oxygen; photosynthesis;
more; release
more; net uptake of carbon dioxide
5 respiration; uptake; release
6 constant
7 Greenhouse
8 greenhouse; global warming
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7.5 Gaseous exchange
between living
things and the environment
i Words to know:
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English term
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Write the words again
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Chinese term
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1
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Gaseous exchange
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2
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Lungs
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3
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Respiration
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4
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Photosynthesis
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5
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Greenhouse
effect
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6
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Global
warming
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i Fill in the blanks:
1 Breathed air contains more carbon dioxide and less oxygen than unbreathed air.
2 Gaseous exchange
occurs continuously between our body and the environment, through which animals
(and plants) take in oxygen from air and release carbon dioxide to the environment.
3 In humans, gaseous exchange occurs
inside the lungs.
4 During daytime, green
plants consume carbon
dioxide and produce oxygen in photosynthesis. In other words, green plants carry
out photosynthesis at a faster rate than
respiration.
Amount
of oxygen produced in photosynthesis more than Amount6 of oxygen absorbed in respiration
Therefore, it has a net release of carbon dioxide.
Amount of carbon dioxide absorbed for
photosynthesis more than amount of carbon dioxide produced in respiration
Therefore, it has a net uptake of
carbon dioxide
5 At night, photosynthesis stops but respiration goes
on in green plants. Therefore, they have net uptake of oxygen and release of
carbon dioxide.
6 The
contents of oxygen and carbon dioxide in nature are kept more or less constant. This is known as the balance of oxygen and carbon
dioxide in nature.
7 Greenhouse effect is the phenomenon that
carbon dioxide (and some other gases) in
the atmosphere traps some of the heat
from the Sun and keeps the Earth warm.
8 The increasing amounts of carbon dioxide in the atmosphere
lead to an excessive greenhouse effect
and hence global
warming.
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