Explanation by: Official MCQ Buddy

In cacti, the stem is modified to perform photosynthesis and store water, making it thick, green, and fleshy.

  • The leaves are reduced to spines to minimize water loss.
  • Roots help in absorbing water but are not the primary modified part.
  • Flowers are reproductive structures and are not modified for survival in deserts.

Thus, the cactus is a modified stem adapted for water storage and photosynthesis.

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