Many cacti do not have leaves but rather have oversized stems.. what role of leaves is therefore taken on by the stems of cacti

a. they produce food by photosynthesis

b. they absorb water and nutrients from the soil

c. they transport materials throughout the plant

d. they store excess water

d.

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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.