Why does the rate of respiration in plants increase when temperature increase

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Stormragexox
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Hey guys, I am struggling to understand this statement 'Daytime temperatures generally higher than night time rate of respiration increases with increased temperature as its enzymes are temperature-dependent'
I don't quite understand how temperature would have an effect on enzymes
Last edited by Stormragexox; 1 year ago
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macpatgh-Sheldon
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Hi,
This does not apply only to plants, but also to poikilothermic [cold-blooded] animals whose temp changes with that of the environment. In general, all physiological processes speed up with increasing temp [up to a point, of course, after which denaturation of proteins occurs].

This sppeding up oif the chemical processes of life [with higher temp] places a greater demand for energy, hence the rate of respiration increases.

Hope this helps!
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Momobubu
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idk sorry
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BobbJo
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'rate of respiration increases with increased temperature as its enzymes are temperature-dependent'

The enzyme and substrate have more kinetic energy at the higher temperature. More molecules have energy above the activation energy. The frequency of successful collisions increases. The rate of reaction thus increases with increasing temperature up to the optimum temperature. Beyond the optimum temperature, the rate of reaction falls as the shape of the active site changes and the substrate can no longer fit in.
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CTLeafez
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(Original post by macpatgh-Sheldon)
Hi,
This does not apply only to plants, but also to poikilothermic [cold-blooded] animals whose temp changes with that of the environment. In general, all physiological processes speed up with increasing temp [up to a point, of course, after which denaturation of proteins occurs].

This speeding up oif the chemical processes of life [with higher temp] places a greater demand for energy, hence the rate of respiration increases.

Hope this helps!
What they said + note that if the temperature becomes too high, respiration will rapidly decrease in speed due to essential enzymes denaturing, thus no longer to assist the metabolic reactions.
Last edited by CTLeafez; 1 year ago
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BobbJo
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(Original post by CTLeafez)
What they said + note that if the temperature becomes too high, photosynthesis will rapidly decrease in speed due to essential enzymes denaturing, thus no longer to assist the reactions.
OP asks about respiration

But what you said is true for respiration too
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CTLeafez
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(Original post by BobbJo)
OP asks about respiration

But what you said is true for respiration too
Of course! Sorry, I read 'plants' and my mind went to photosynthesis.
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