why plants in hilly areas have needle shape leaves

Dear student, 
Please find below the solution to the asked query 

Plants in hilly areas have needle-shaped leaves as an adaptation because:
1. Shape of the leaf helps in retaining water by reducing evaporation. They are covered with the waxy coating which reduces transpiration (type of water loss).
2. Needles are narrow. Hence, snow does not remain on it and no damage is caused by it to the leaves.
3. It helps in extending rate and period of photosynthesis.
Hope this information will clear your doubts about the topic. 
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The needle shaped leaves are a very important adaptation for plants in hilly areas as they do not accumulate much snow keeping the weight load mild.
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