Less stomata because stomata is the pathway through which water transpires. A cactus' habitat is much drier than normal tropical plants, therefore it would require less transpiration to survive. In order to lessen transpiration, they have less stomata.
It is expected that a cactus plant will have less stomata than a tropical plant because it needs to conserve water.
STOMATA:
Stomata is a structure of a plant that controls gaseousexchange in plants. The opening and closing of the stomata brings about the taking in and out of gases like O2 and CO2 in plants.
However, when the stomata of a plant opens, water in form of vapor is lost to the atmosphere.
Cactus are xerophytic plants i.e. they live in arid regions or deserts where water availability is low. Hence, they need to conserve any moisture they get their hands on.
Since the stomata makes a plant lose water, cactus plant will have less stomata than a tropical plant.
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