assertion : opening and closing of the pore is a function of the guard cell REASON : STOMATAL PORES ARE THE SITE ( PLACE ) FOR EXCHANGE OF GASES BY DIFFUSION both A AND R TRUE BUT R IS CORRECT EXPLANATION OF A (ii) both A AND R ARE TRUE BUT R IS NOT TRUE EXPLANATION OF A (iii) a is true r is false (iv)a is false r is true
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Guard cells are specialized plant cells in the epidermis of leaves, stems and other organs that are used to control gas exchange. ... The stomatal pores are largest when water is freely available and the guard cells turgid, and closed when water availability is critically low and the guard cells become flaccid.
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REASON: Diffusion is a fast process but only occurs at the surface of the body. 3. ASSERTION: The opening and closing of the pore is a function of the guard cells. REASON: Stomatal pores are the site for exchange of gases by diffusion.
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