Answer :
It is not necessary to water cacti very often in the winter since they can retain water for about four months. The stem stores water for the plant. Cactus stems and roots are loaded with parenchymal cells, which are responsible for water storage.
Definition of parenchyma.
The ground meristem gives rise to a three-tissue system—the parenchyma, collenchyma, and sclerenchyma—that make up the ground tissue system.
Ground cactus tissue is rich in water-storing parenchyma cells.
It follows that cacti's ability to retain water for extended periods of time is due in large part to the ground tissues.
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