Question

design and describe the anatomy of a leaf from a plant that would be ideally suited to seasonally very hot and very dry climatic conditions. Include in your description the arrangement of important tissues and cells?

Answer 1

Solution The epidermis of dry, hot dessication tollarant plant leaf consists of a single layer of small compact and heavily cutinized cells. So Most epidermal cells contain dark staining deposits of waterproofing resins with Long epidermal hairs and stomata are present over the entire leaf surface. Stomata are roofed and deep by epidermal cells with ledge like extension of cutin and overlay large substomatal chambers over there. There are two or three rows of tightly packed palisade mesophyll are present below the adaxial and abaxial epidermis. Here Spongy mesophyll is reduced to a narrow central band that supports the vascular bundles and In some preparations resins may be seen lining the stomatal cavities and coating the outsides of palisade cells. Here The Idioblasts containing crystals of calcium oxalate are abundantly distributed through both mesophylls cells. The Small, centrally located vascular bundles span the breadth of the leaf with bundles are collateral and closed with xylem of vessels and tracheids towards the adaxial(upper) surface and phloem of sieve tubes and companion cells towards the abaxial (bottom) surface of leaf.Cambium is not present inside leaf vasulature. Here Each vascular bundle is wrapped by a bundle sheath and supported towards adaxial and abaxial surfaces by small caps of supportive sclerenchyma. Abaxial caps are especially well developed.