HORTICULTURE SCIENCE
ULTRA STRUCTURE OF PLANT CELLS AND ORGANS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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To protect the photosynthetic cells under the skin
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To avoid water loss
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To allow gas exchange with a large surface area
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To absorb sunlight for photosynthesis
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Detailed explanation-1: -Spongy mesophyll – have very few chloroplasts and a large surface area to increase the diffusion of carbon dioxide and oxygen. Intercellular air spaces within the spongy mesophyll layer – they allow the diffusion of carbon dioxide and oxygen.
Detailed explanation-2: -Gas exchange The spongy mesophyll cells are covered by a thin layer of water. Gases dissolve in this water as they move into and out of the cells. When the plant is photosynthesising during the day, these features allow carbon dioxide to diffuse into the spongy mesophyll cells, and oxygen to diffuse out of them.
Detailed explanation-3: -In plants, it is part of the mesophyll, where it forms a layer next to the palisade cells in the leaf. The spongy mesophyll’s function is to allow for the interchange of gases (CO 2) that are needed for photosynthesis.
Detailed explanation-4: -Leaf spongy mesophyll cells form an interconnected network of branched cells and intercellular spaces to maximize the surface area available for light capture and photosynthetic gas exchange.
Detailed explanation-5: -These are the cells of the spongy parenchyma (or spongy mesophyll). The air space found between the spongy parenchyma cells allows gaseous exchange between the leaf and the outside atmosphere through the stomata. In aquatic plants, the intercellular spaces in the spongy parenchyma help the leaf float.