Question

Explain about "respiration in plants"

Answer 1

Plant respiration is the opposite of photosynthesis, which is a biological process performed by green plants that creates oxygen and releases it into the air. During respiration, plants absorb free molecules of oxygen (O2) and use them to create water, carbon dioxide, and energy, which helps the plantgrow.
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Answer 2

All living things get the energy they need to live from a chemical reaction called respiration. This process needs glucose as a starting point. First we'll see how respiration works, and then look at how plants use respiration in combination with photosynthesis.

Respiration

Living cells respire. Aerobic respiration is the chemical reaction used to release energy from glucose. It is called aerobic because oxygen from the air is also needed.

Here is the word equation for aerobic respiration. Energy is put in brackets because it not a substance:

glucose + oxygen → carbon dioxide + water (+ energy)

Notice that the word equation for respiration is the reverse of the word equation for photosynthesis. Check back if you are not sure of this.

Plants

Plant cells respire, just as animal cells do. If they stop respiring, they will die. Remember that respiration is not the same as breathing, so take care - plants do not breathe.

As we can see from the word equations respiration and photosynthesis are opposites. Respiration uses oxygen and produces carbon dioxide. Photosynthesis uses carbon dioxide and produces oxygen.

So what happens to a plant overall? This depends on whether it is in the dark or the light, and how bright the light is.

Plants respire all the time, whether it is dark or light. They photosynthesise only when they are in the light.