Question : Stem is usually
Option 1: positively phototropic
Option 2: negatively phototropic
Option 3: negatively geotropic
Option 4: positively barotropic
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Correct Answer: positively phototropic
Solution : The correct answer is positively phototropic .
Most plant stems display positive phototropism when they grow towards light. This reaction enables stems to appropriately orient leaves and other photosynthetic structures to capture the light energy necessary for photosynthesis. Positive phototropism is an adaptation that allows plants to maximise their ability to generate energy from sunshine, which is necessary for growth and survival.
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