4. Modified stem: sweet potato:
spines of cactus. C
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Modified root : Sugarbeet, sweet potato, turmeric, carrot, radish. Question 21 Why is stem of cactus thick and green? Cactus plant has modified stem which conserves water in the green fleshy stem which is photosynthetic. Its stem is thick and green due to the presence of chlorophyll in it.
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