Sheela wants to make a computer model of a land ecosystem. part of her model simulates the chemical processes of photosynthesis that involve the creation of sugars. which chemical processes are these? a the light-dependent reactions. b the light-independent reactions. c the daylight reactions. d the reactions in the mitochondria.

The correct answer is option A, that is, the light-dependent reactions.  

The light-dependent reactions are accountable for the generation of glucose molecules, with the use of water and carbon dioxide along with sunlight. In the process, the glucose is dissociated down by the process of respiration, in order to generate ATP in mitochondria.  

The light-dependent reactions utilize light energy to produce two molecules required for the next level of photosynthesis, that is, the energy storing molecule ATP and the reduced electron carrier NADPH. In plants, the light reactions occur in the thylakoid membranes of organelles known as chloroplasts.  

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.