These are generally, but not always, developed above the birch zone and in patches, sometimes extensive, within it, probably conditioned by edaphic and biotic factors, in Kashmir, Gilgit, Chitral and Hazara. This type ascends normally to ______ or more above the sub-alpine forests and climate must be similar but more severe than in sub-alpine forests:

Question

Accepted Answer

150 m. The question describes the upper limit of the sub-alpine forest zone in the specified Himalayan/Karakoram regions. Standard botanical and geographical texts for this region state that these forests (often birch or coniferous) ascend to approximately 150 meters above the general sub-alpine level, or reach elevations around 3600-4000m depending on the specific zone definition, but in the context of typical MCQs on this specific text source, 150 m is the standard accepted answer for the additional ascent.