Looking at a cactus may make impression that they evolved separately from other plants, which usually have stem, leaf and fruit.

But the fruit in cactuses has the same structure and surface as the leaf and stem, and grows from leaves. How this could come? Cacti are flowering plants, so should had evolved from normal plants. enter image description here

  • $\begingroup$ cactus have stem leaves and fruit, the needles are modified leaves, the big flat green parts are the stem. $\endgroup$
    – John
    Aug 11 at 13:13
  • $\begingroup$ It makes sense if you think of it in terms of water conservation. Cacti are adapted to environments where there's plentiful sunlight, so growth is limited by water. $\endgroup$
    – jamesqf
    Aug 11 at 16:29

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