Question

opuntia has spine but carissa has thorn. what is the difference​

Answer 1

Answer:

opuntia has a spine that is the reduced leaf adopted for xerophytic condition and carissa has thorn which is aerial modification of stem

Answer 2

Explanation:

Generally found in the deserts, Opuntia is a xerophytic plant, whose leaves are modified into spines. The modification of the leaves into spines is a characteristic of the xerophytic plants, which is an adaptation of the plants to prevent losing water by transpiration in the deserts, where there is a scarcity of water.  

Carissa is a type of small shrubs native to the tropical and subtropical Africa. The thorns in Carissa is the aerial modification of its stem.