A thick cuticle reduces water loss through transpiration, helping desert plants conserve water. Underwater plants do not face water shortage, so a thick cuticle would hinder gaseous exchange and absorption, making survival and normal functioning difficult.
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Dead xylem vessels form continuous tubes for water transport. Living leaf cells lose water through transpiration, creating transpiration pull. This pull draws water upward through xylem against gravity, maintaining continuous movement from roots to leaves in plants.
Without stomata, plants could not exchange gases or perform proper transpiration. Photosynthesis, respiration and cooling would be affected. Water transport through transpiration pull would reduce, disturbing growth, food preparation and overall survival of the plant.
Nervous tissue enables us to sense heat or cold. Specialised nerve cells called neurons receive sensory information from receptors in the skin and transmit messages to the brain, which interprets the sensations and produces appropriate responses.
Simple squamous epithelial tissue in the lungs allows oxygen to enter the blood. Its thin, flat cells provide a short diffusion pathway, enabling rapid exchange of oxygen and carbon dioxide between air sacs and blood vessels efficiently.