Conifers are adapted to tolerate extreme environmental conditions because of Thick cuticle, Broad hardy leaves, Superficial stomata, Presence of vessels

Conifers are gymnosperms and lack vessels. Needle-shaped leaves of gymnosperms are adapted not to accumulate much snow, the presence of waxy cuticle and sclerenchyma protect the underlying mesophyll cells, tightly packed tissues protect the central vein containing vascular tissues. Thus, these leaves are well adapted to withstand the harsh and cold climate. They have sunken stomata to preserve water loss during physiological drought conditions. So, the correct answer is 'Thick cuticle'