Question

4. Spines of cactus are modified
(A) Leaves
(B) Stems
(C) Roots
(D) Flowers
(E) Fruit​

Answer 1

Answer:

Most species of cacti have lost true leaves, retaining only spines, which are highly modified leaves. As well as defending against herbivores, spines help prevent water loss by reducing air flow close to the cactus and providing some shade.

Explanation:

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Answer 2

Spines. Botanically, "spines" are distinguished from "thorns": spines are modified leaves, and thorns are modified branches. Cacti produce spines, always from areoles as noted above.