Question Video: Outlining How Plants Reuse the Waste Products from Respiration | Nagwa Question Video: Outlining How Plants Reuse the Waste Products from Respiration | Nagwa

Question Video: Outlining How Plants Reuse the Waste Products from Respiration

Plants, like most living organisms, respire. Water is a waste product of respiration. How can this water be reused by plants?

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Video Transcript

Plants, like most living organisms, respire. Water is a waste product of respiration. How can this water be reused by plants? (A) As an insulating gas to regulate temperature. (B) As a source of nitrogen for the synthesis of nitrogenous compounds. (C) As a reactant in photosynthesis. Or (D) as a source of energy for metabolic processes.

This question asks us about how plants can recycle the water that is generated as a waste product of respiration. To figure out the correct answer, let’s take a closer look at respiration and how the water it produces can be used in a plant.

In both plant and animal cells, simple sugars like glucose are broken down to release energy through a process called cellular respiration. When it occurs in the presence of oxygen, this process produces water and carbon dioxide. It also generates many molecules of ATP, a high-energy compound that can be quickly broken down to release energy whenever it is required in cells for various cellular processes. This process usually occurs in specialized organelles called mitochondria.

You might have learned that the majority of plants are autotrophic, which means that they are able to produce their own glucose. Most plants achieve this through a process called photosynthesis, which occurs in organelles called chloroplasts in the presence of light energy. Interestingly, plants can use the products of cellular respiration, carbon dioxide and water, as reactants for photosynthesis. Similarly, the products of photosynthesis, glucose and oxygen, are used as reactants in cellular respiration. So these two processes go hand in hand in plant cells. This allows plant cells to maximize their efficiency by reusing certain metabolic waste products.

Now we can answer this question. The way in which the water produced as a waste product of respiration can be reused in plants is (C), as a reactant in photosynthesis.

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