Question

why is cactus known as an unusual plant​

Answer 1

Ello user !!!!!!

Here is your answer,

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Unlike most plants, cactus need very minimal amounts of water, thriving in well-drained areas.

They store what water they do get, allowing them to survive droughts.

Thus, they are unusual

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Answer 2

Answer:

Cactus is known as an unusual plant because it has undergone several anatomical and physiological modifications to adapt itself to the hot and arid conditions of the desert, where they generally grow.

Explanation:

Cactus have lost their leaves to reduce surface area for water loss, replaced by spines and thorns that protect them against animals. The stems are enlarged to store water, perform photosynthesis and have waxy coating to reduce water loss.  

They have shallow, spread-out roots to collect water from the ground close to the surface. These features and adaptations in cactus make them different from other plants and unusual in nature.