PLANT PHYSIOLOGY
TRANSPORT IN PLANT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a thin waxy cuticle
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small numerous stomata
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plants with stomata that open during the night
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ability to lose leaves during the wettest part of the year
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Detailed explanation-1: -Their stomata only open at night, when humidity tends to be higher and temperatures are cooler, both factors that reduce water loss from leaves. CAM plants are typically dominant in very hot, dry areas, like deserts.
Detailed explanation-2: -Leaves and stems of many desert plants have a thick, waxy covering, keeping the plants cooler and reducing evaporative loss. Some plants, such as Ephedra (Mormon tea) and cacti, carry out most or all of their photosynthesis in their green stems.
Detailed explanation-3: -The opening of stomata through night time is a physiological alteration to prevent loss of water through transpiration.-Sedum, Kalanchoe, Pineapple, Opuntia are some examples of CAM plants. These plants also carry out double carbon dioxide fixation.
Detailed explanation-4: -Stomata are mouth-like cellular complexes at the epidermis that regulate gas transfer between plants and atmosphere. In leaves, they typically open during the day to favor CO2 diffusion when light is available for photosynthesis, and close at night to limit transpiration and save water.
Detailed explanation-5: -Plants close stomata in response to their environment; for example, most plants close their stomata at night. Under drought, plants may also close their stomata to limit the amount of water that evaporates from their leaves.