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Why are leaves modified to form spines in the cactus plant how then does the cactus plant make food?

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The cactus adapted to its harsh environment by developing thick skin to slow the evaporation of water. The leaves changed in order to reduce the surface area that water could evaporate from and over time became defensive spines to protect itself from animals trying to get inside its thick skin for the moisture.

The cactus makes its food, by having chlorophyll throughout the rest of plant. That is why the entire cactus is green.
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Why are the leaves of cactus reduced to spines?

They are present in hot deserts which are scarce in water so in order to reduce the loss of water by Transpiration from the surface of the leaves, its leaves are reduced to sp

Why do cactus plants not have leaves?

Leaves provide extra surface area for water to evaporate out of the plant. In the arid desert, plants need all the water they can get.

Which is a modification into the spine in a cactus plant?

The cactus adapted to its harsh environment by developing thick  skin to slow the evaporation of water. The leaves changed in order  to reduce the surface area that water co

Why do cactus leaves drop off the plant?

It might be too cold.   More likely you are over watering it.  To prepare for xerophytic conditions the cactus leaves drop off  the plent. 

What foods do the cactus plant need?

Obviously judging from the cacti's arid environment where water is a rarity, one must conclude that in fact they eat dirt, sand, or any other soil like material. Cacti also mo

What is the cactus plant?

A cactus (plural: cacti, cactuses, or cactus[1]) is a member of the plant family Cactaceae, within the order Caryophyllales. The word cactus is derived through Latin from the