पहाड़ो पर पेड़ लम्बे क्यों होते हैं

Because they need light to produce energy and thus grow towards the light and have adapted better at growing taller than other plants in search of light.

By the way: One study found that Douglas firs have the highest theoretical height, but most of the world’s tallest trees are redwoods.

one of the world’s tallest trees is about 138 meters