the lower layer of the ground tissue of a leaf, characteristically containing irregularly shaped cells with relatively few chloroplasts and large intercellular spaces.
A layer of cells in the interior of leaves, consisting of loosely arranged, irregularly shaped cells that have chloroplasts. The spongy parenchyma has many spaces between cells to facilitate the circulation of air and the exchange of gases. It lies just below the palisade layer. Also called spongy mesophyll. See more at photosynthesis.
- Spongy substance
spongy substance n. See spongy bone.
noun 1. an engagement or promise, especially one made on behalf of another. 2. International Law. an engagement made on behalf of a government by an agent acting beyond his or her authority or without the required authorization and not binding on the government unless ratified. 3. the act of becoming surety for another. noun […]
noun 1. a structure projecting from the side or main deck of a vessel to support a gun or the outer edge of a paddle box. 2. a buoyant appendage at the gunwale of a canoe to resist capsizing. 3. Aeronautics. a protuberance at the side of a flying-boat hull, designed to increase lateral stability […]
noun 1. a person who vouches or is responsible for a person or thing. 2. a person, firm, organization, etc., that finances and buys the time to broadcast a radio or television program so as to advertise a product, a political party, etc. 3. a person who makes a pledge or promise on behalf of […]