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Why does a cactus have a thick stem?


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Answered 2010-05-16 09:38:52

Enlarged stems carry out photosynthesis and store water. Unlike many other succulents, the stem is the only part of a true cactus where this takes place. Much like many other plants that have waxy coatings on their leaves, Cacti often have a waxy coating on their stems to prevent water loss. This works by preventing water from spreading on the surface and allowing water to trickle down the stem to be absorbed by the roots and used for photosynthesis. Cacti have a thick, hard-walled, succulent stem - when it rains, water is stored in the stem. The stems are photosynthetic, green, and fleshy. The inside of the stem is either spongy or hollow (depending on the cactus). A thick, waxy coating keeps the water inside the cactus from evaporating.

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The thick stem of a cactus holds water.


Cacti have a thick and succulent stem because the rainwater is stored in the stem. A thick coating also holds the water inside the cactus and prevents it from evaporating.


A cactus that stores water in its stem is called a stem succulent. The stem has tissues that are capable storing large quantities of water. The stem also has a thick waterproof epidermis covered by a waxy cuticle that prevents loss of water due by evaporation. Examples of stem succulents - Cardon Cactus, Organ Pipe Cactus, Saguaro Cactus


Thick-stemmed cacti store moisture in their cells, which swell when water is available.


The stem which is the thick part of the cactus plant stores food.:)


The stem is thick to make the plant better able to store water. Cacti live where it is very dry, so they need to conserve water any way they can.


the cactus includes small and spiky leaves that reduce evaporation of water. It also prevents loss of water. The cactus has also a thick and juicy stem that stores water.


cactus stems carry out photosynthesis and store water. Unlike many other succulents, the stem is the only part of a true cactus where this takes place. Much like many other plants that have waxy coatings on their leaves, Cacti often have a waxy coating on their stems to prevent water loss. This works by preventing water from spreading on the surface and allowing water to trickle down the stem to be absorbed by the roots and used for photosynthesis. Cacti have a thick, hard-walled, succulent stem - when it rains, water is stored in the stem. The stems are photosynthetic, green, and fleshy. The inside of the stem is either spongy or hollow (depending on the cactus). A thick, waxy coating keeps the water inside the cactus from evaporating.


A cactus has a soft stem with sharp spikes.


Cactus have no leaves. They have turned into thrones. Its stem is photosynthetic


A cactus stores water in its stem.


thick and waxy skin, spiky leaves, flexible stem and shallow roots.


cactus have a hollow stem. it is where they store water and food for survival


An interesting fact about a cactus is that a cactus has a thick, juicy and swollen stem inside his body which helps it to store water and when it gets thirsty because of the extremely hot weather, he can drink the water anytime he wants.


yes ! Cactus has long stem because it dosent have leafs to make chlorophyll so the stem makes food.


The skin of a cactus stem generally has a smooth papery feel. It is firm to the touch if healthy.


A cactus has no leaves but does have a stem.


To help the cactus conserve water.


Cactus stems are very thick because they store water.


Cactus plants stop water loss mainly by modified leaves and thick stems. They have leaves in the form of thorns, spines, quills, prongs, needles or bristles. Such modified leaves have smaller surfaces from which water can evaporate. Additionally, the stomata or breathing pores are found on the cactus stem instead of the typical herbaceous location of the leaf surface. The outer skin of the cactus stem is thick and thereby prevents the escape of the water supplies inside the interior tissue.



The 'spines' of a cactus attach directly to the stem of the plant.


Water is stored in tissue in the stem of the cactus.


It reflect light away from the cactus stem theoretically lowery the stem temperature


a cactus may have leaves and can store water as well in the stem



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