Question

Conifers are adapted to tolerate extreme environmental conditions because of
A. Thick cuticle
B. Presence of vessels
C. Broad hardy leaves
D. Superficial stomata

Answer 1

Hint: Plants in the Plantae kingdom have various phyla which have different unique features. Some have vascular systems, some are simple, some are complex, some generate seeds while some are seedless. The way from simple to complexity is all evolution which happens with the requirement and time.

Complete answer:
Gymnosperms have no outer covering of the seeds. They do not give flowers and fruits. They are the non-flowering plants. Their strong root system is good for soil erosion. They are good sources of fuels like conifers. They are heterosporous and have two types of spores.
Option A: Thick cuticle: their thick cuticle with wax and sclerenchyma cells will protect mesophyll cells. They will give protection to tightly packed tissues of vascular bundles. Thus the leaves will withstand the extreme conditions like a cold, harsh climate.
Option B: Presence of vessels: Vessels will conduct the water and food to the parts of the leaves. In extreme conditions, they can wither or wilt.
Option C: Broad hardy leaves: The broad hard leaves will increase the surface area for the photosynthesis, this will not protect them.
Option D: Superficial stomata: They are the food factories of the leaves. They exchange the gases to respire.

So, the answer is option A: Thick cuticle

Note:
Plants have been adapted to various conditions depending on their surroundings. They can adapt themselves according to the requirements. Some can grow in less water, while some need excess of water to grow. The presence of salt concentration is also another aspect.
Xerophytes are adapted to the harsh extreme conditions of dryness. They can live with very less amount of water as they use the stored water for their daily life. They are usually found in the desert arid regions. They will have adaptations to avoid transpiration.