Because they are in the desert where the effect of the sun is overkilling,hence they have evolved this form for their survival(adaptation)
Leaves have evolved into spines on the cactus.
the leaves of a cactus help get the suns nutrition foe the plant to grow None pretty much and formally proper cactus have no leaves only it's convergently evolved cousins do.
A cactus has no leaves.
A cactus has no leaves but does have a stem.
cactus
No. Some may be considered as leaves but not really. Christmas cactus for instance grows in thin segmented stalks reminiscent of leaves. Cactus flowers have petal that are leafy and green like leaves but not really leaves. barrel cactus and saquaros obviously have no leafy protrusions beyond their flowers.
A cactus leaves get sunlight and they make photosynthesis and they get water from that and they save the water
a cactus has spiny leaves for protection and so the water wont evaporate so easily.
Acanthus and cactus but cactus not really leafy :)
defence. the cacti leaves are the thorns...
The main difference between cactus and succulent is that cactus consists of areoles and no leaves whereas succulent contains fleshy leaves and no areoles.
cactus