This process is called autophagy.
Autophagy is an intracellular process of degradation, which includes the destruction of cytoplasmic components in the lysosomes. These components are considered unnecessary or dysfunctional and that is why they are recycled by the cell.
Autophagy has four sequential steps which are the sequestration, the transport of the components to the lysosome, the degradation, and the recycling and utilization of the degradation products.
Autophagy is considered as an adaptive response to stress by ensuring the survival of the cell and the tissue.
Thus, Cactus survive with the help of its "green stems" and "transpiration".
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Answer - What is the purpose of the activity ? Is there an article or picture you can snap a overview of what the details of the work is about ?
Reasoning - Little Details