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Guard cells regulate the opening and closing of stomata, thereby controlling transpiration in plants.
Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Anatomy of Dorsiventral and Isobilateral Leaf
Stomata are small openings on the leaf surface that regulate gaseous exchange and transpiration.
Ref: NCERT Class 11 Biology chapter - Morphology of flowering plants
When water flows into the guard cells, they swell, causing the stomatal pore to open. When they lose water, they shrink and the pore closes.
Ref: NCERT Text book class 10 Biology Chapter 5 life process
B fits best: Turgor pressure of guard cells. Keep the STOMATA MOVEMENT basics straight and Turgor pressure of guard cells stands out as the precise answer. Avoid: A) Osmotic pressure of epidermal cells; C) Capillary action; D) Diffusion pressure deficit. Light and flowering items often hinge on which photoreceptor or day-length rule is in play.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.
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