Defense mechanism...?
The ocotillo plant is a common desert plant found in the southwestern United States and Mexico that has thorns but is without leaves. It is known for its long, vertical stems covered in sharp spines, which help reduce water loss and protect the plant from herbivores. The plant produces leaves only after a rainfall to maximize its photosynthetic potential.
Generically they are called "cactus" plants or "cacti"
Cacti live in the deserts of the Americas and many have sharp spines. In Africa there are other plants, euphorbias for example, that resemble cacti but have thorns rather than spines.
Brambles and roses have thorns. Cacti have sharp spines and holly has spikey leaves. This is to stop animals from eating them.
Yes, cacti are dicots. Dicots are a type of flowering plant that have two seed leaves, whereas monocots have one seed leaf. Cacti belong to the class Magnoliopsida, which includes dicots.
if you are talking about a plant that used to have leaves and lost them, than the now leafless plant loses (or has water travel faster through it) than with leaves, if you are talking about plants that are always leafless (cacti) it isn't faster than leaf plant because they store their water better so it moves very slowly in cacti.
The plant you're referring to is likely the cactus. Cacti are adapted to arid environments and have thick, fleshy stems that store water, allowing them to survive long periods of drought. Their sharp spines serve as a defense mechanism against herbivores and also reduce water loss by minimizing airflow around the plant.
Cacti differ from other plants by having modified leaves called spines or needles, which help reduce water loss and protect the plant from animals. This adaptation allows cacti to thrive in arid environments where water is scarce.
Cacti produce food through photosynthesis in their green stems, not their leaves. In cacti, the stems have chlorophyll and are adapted to conduct photosynthesis, allowing the plant to create its own food. This adaptation helps cacti survive in arid environments where water loss is a concern.
If you can find a plant with tuxedos on its leaves then I would vote for that one
Cacti have spines that evolved from leaves.
Cacti are typically classified as evergreen plants, meaning they retain their foliage year-round. However, some cacti species may shed their spines or leaves in response to environmental changes or seasonal variations.