It would not be possible for plants with large leaves to tilt towards the sun in order to survive in a desert. 
Answer: Option A
Step-by-step explanation:
Heliotrophism is the seasonal movement of plant parts with respect to the direction of sun. These desert plant does not exhibit heliotropic leaf movement. But still the plant angle play mojor role in light and energy balance.
Desert plants make use of the resources available to them. They use the light and heat energy released by the sun to convert 
 and water (
 and water (
 ) into sugar, a method referred to as chemical action. Throughout this method, stomata on a plant's leaves and stems receptive absorb
) into sugar, a method referred to as chemical action. Throughout this method, stomata on a plant's leaves and stems receptive absorb 
 from the air and reciprocally unleash element. Whenever a plant is about to open its pores, some amount of water escapes due to sun's heat. This is often referred to as transpiration, loss of water.
 from the air and reciprocally unleash element. Whenever a plant is about to open its pores, some amount of water escapes due to sun's heat. This is often referred to as transpiration, loss of water.