Yes, the part of the cactus that's eaten dies. But no, what's left of the cactus plant doesn't die necessarily. It depends upon the size of the piece that's eaten, the manner in which the piece is removed, and the condition of the remaining body parts.
Thorns, spines
no
No, not all types of cactus can be eaten. For example, the prickly pear cactus [Opuntia spp] is a fruit bearing plant. Its fruits may be green, purple or red in color. But it's the green colored fruit that tends to be eaten fresh or processed as jams and jellies. The darker colored fruits tend not to be flavorful.
Cactus, like other plants, uses photosynthesis to get energy.
Cactus
Many types of cactus are edible and commonly eaten by people. Prickly pear cactus is one example.
It would probably suffer from root rot and die. The cacti are not water plants.
It does get eaten. By humans and camels and such... But normal animals don't because they have little pointy things that jab your face. It hurts a lot!
Yes, some cactus plants can be toxic to cats if ingested. It is important to keep cactus plants out of reach of cats to prevent any potential harm.
Cactus
A barrel cactus can be used for various purposes. Its fruits, known as "cactus apples" or "tunas," are edible and can be eaten raw or made into jams and jellies. The cactus's flesh can also be cooked and consumed, while its spines can be utilized for crafting or as natural needles. Additionally, barrel cacti can be ornamental plants, adding beauty to gardens and landscapes.
Yes, Christmas cactus plants are non-toxic to cats.