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The stem is green and fleshy in cactus. ...

The stem is green and fleshy in cactus. Give reason.

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**Step-by-Step Solution:** 1. **Understanding the Environment**: Cacti are adapted to live in harsh environments where water is scarce. This is a key factor in their structural adaptations. 2. **Modification of the Stem**: In cacti, the stem has evolved to become green and fleshy. This modification is crucial for their survival in arid conditions. 3. **Storage Function**: The fleshy and spongy nature of the cactus stem allows it to store water and nutrients. This is essential because cacti need to conserve water for long periods. ...
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