Photo Feature
Autumn Leaves
<p><em>As days shorten and temperatures drop, autumn leaves begin to fall. These forests of oak, maple and walnut, with their associates, now undergo a marvellous transformation. Their green pigment (chlorophyll) breaks down, revealing underlying yellow (xanthophyll) and orange (carotene) pigments. In some species, such as the Himalayan maple </em>Acer oblongum<em>, locally known as chinar, and the mighty Himalayan oak </em>Quercus leucotrichophora<em>, leaves eventually turn red on account of the sugars and tannins trapped inside, which form anthocyanin</em>.</p>
<p><strong>Photo:Bilal Nasir Zargar</strong></p>