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generally xerophytic plants have sunken stomata
hydrophytes
The leaves of a cactus have been reduced to spines to deter herbivory. The stems are fleshy and photosynthetic. The stomata are sunken into the surface of the leaf to increase the boundary layer.
Adaptations that enable plants to reduce water loss from leaves are: thick waxy cuticle - reduce evaporation reduced leaf surface area (eg. needles - cacti) closing stomates at midday, when hottest or during the day - reduce traspiration fewer number of stomates store water for long periods of time and absorb it quickly, usually plants have and extensive shallow root system have long roots, and loose their leaves - reduce stranspiration and absob water from dry soil seasons, grow and die in one season Physiological adaptations being CAM plants vs C4 plants
The stomate are located in the same place as other plants, leaf and stems. Their stomate are much smaller and sometimes sunken deeper into the surfaces to help keep water loss at a minimum. Also, the stomate on catus only open at night when it is cool outside.
generally xerophytic plants have sunken stomata
hydrophytes
Most xerophytic plants have waxy coating on epidermal cells of leaves to minimize water loss by transpiration. For this reason these plants also have sunken stomato gaurded by trichomes etc.
Transpiration.
Sunken is not a verb so it doesn't have present or past tense. Sunken is an adjective
In the store, choose leaf lettuce whose leaves are crispy and bright in color. Avoid sunken leaves with spots or discoloration. Regardless of the type, all lettuces should feature crispy, fresh leaves that are free of dark or slimy spots.
The opposite of a sunken area would be a raised area or an elevated area.
The Sunken Billions was created in 2008.
The Sunken Cemetery was created in 2002.
The Sunken World was created in 1948.
Sunken Treasures was created in 1993.
Plants adapt according to prevailing environmental conditions. If there is scarcity of water, measures are taken to conserve water and minimize the loss of water by transpiration. For this a lesser number of stomata in sunken positions are found. Either the leaves become smaller or coated with wax and develop plenty of latex. The vascular system is well developed. The plants facing excessive grazing herbivores develop thorns & spines and a foul smell when plucked. Likewise plants growing in water adapt accordingly.