Contents Summary 706 I. The number of leaves on a node in the stem depends on the species, but dicots usually have two or more leaves arising from a single node. The leaves are small in size ranging between 4-5 inches in length. 711 V. Flat laminar growth: patterning and coordination of adaxial-abaxial and mediolateral axes 713 VI. A grass leaf is a monocot leaf with an elongated structure that arises from the node consisting of a basal cylindrical sheath encircling the stem and other younger leaves. Dicot leaves are not as linear in shape as monocot leaves, and their vascular structures form net-like veins, instead of parallel ones. The spaces present next to the stomata is called respiratory cavities or sub-stomatal cavities. Dicot: The embryonic root (radicle) grows into a strong central tap root. Monocot leaves have stomata on both upper and lower surfaces and thus are termed amphistomatous. Shape. Monocot leaves have comparatively tighter intracellular space due to the compact arrangement of mesophyll cells: Differentiation of Mesophyll: Differentiated into two parts – upper palisade and lower spongy mesophyll: No such differentiation in a monocot leaf: Venation Pattern: Reticulate venation (web-like pattern) Venation definition, the arrangement of veins, as in a leaf or in the wing of an insect. Dicot leaves are broad and relatively smaller than monocot leaves. It is of two types. The mesophyll is the ground tissue of leaves present between the upper and lower epidermis of the leaves. The stomata take in carbon dioxide from the air and give out oxygen during photosynthesis. Epub 2016 Jun 23. asked Feb 13, 2018 in Class XI Biology by nikita74 (-1,017 points) Reticulate venation is found in dicot leaves while in monocot leaves venation is of parallel type. These air spaces facilitate the exchange of gases between the cells. In monocots with striate venation (and in eudicots such as pitcher plants; Franck, 1976), a similar process unfolds. 0 votes . Reticulate venation is seen in dicot plants like mango, hibiscus, ficus, etc. The epidermis is present both on the upper and lower part of the leaf. Reticulate venation is whereby vein are interconnected and form a web-like network. The large vascular bundles have two patches of sclerenchyma cells above and below. The number of stomata on the upper and lower surfaces of the leaves is equal, and thus monocot leaves are also termed amphistomatous. Reticulate venation is found in dicot leaves while in monocot leaves venation is of parallel type. Monocotyledonous leaves are narrow and elongated with parallel venation, which is often used to distinguish monocotyledonous plants from dicots. https://horticultureandsoilscience.fandom.com/wiki/Monocotyledon These cells assist in the rolling of the leaves in response to weather change. But there are some exceptions as some dicot plants show parallel venation, e.g., Calophyllum, Corymbium, etc., and reticulate venation is also shown by some monocot plant e.g., Alocasia, Smilax, etc. The following are some of the functions of monocot and dicot plants; Save my name, email, and website in this browser for the next time I comment. The venation pattern in a dicot leaf is reticulate. Small green appendages called stipules might be present at the base of the petiole in some dicot leaves. Image Source: BrainKart. Reticulate venation is found in dicot leaves, while in monocot. Monocots and dicots differ in their patterns of venation. The guard cells are dumb-bell shaped in dicots. Epidermal cells of dicot leaf do not have silica deposition. Besides, it also plays an important role in gas exchange as it contains tiny pores called stomata. A maize leaf is divided into three regions; an upper blade, lower sheath, and auricle. The innermost layer of tissues in plant leaves is the vascular bundle which is present underneath the mesophyll and along the veins of the leaves. Furthermore, monocot leaves are bicollateral leaves while dicot leaves are dorsoventral leaves. Lee Yuen Lew (2000) Storage Organs and Plant Growth, Science Activities, 37:2, 39-46, DOI: Nelissen H, Gonzalez N, Inzé D. Leaf growth in dicots and monocots: so different yet so alike. The mesophyll of dicot leaves is not differentiated. Not every species produces leaves with all of these structural components. Monocot leaves have comparatively tighter intracellular space due to the compact arrangement of mesophyll cells: Differentiation of Mesophyll: Differentiated into two parts – upper palisade and lower spongy mesophyll: No such differentiation in a monocot leaf: Venation Pattern: Reticulate venation (web-like pattern) The leaf blade of maize leaf contains adaxial and abaxial epidermal tissue that encloses the mesophyll and vascular tissue. The xylem in monocot leaves is differentiated into metaxylem and protoxylem. Monocot leaves show parallel venation while dicot leaves show reticulate venation. The embryonic root dies. Learn how your comment data is processed. The epidermis is essential as it prevents the loss of excess water as it is a waxy waterproof layer. The epidermis of monocot leaves has bulliform or motor cells. The vascular bundles in leaves display highly divergent patterns in terms of size and position. The bulliform (motor) cells are absent in the epidermis of a dicot plant leaf. Dicot leaf shows reticulate venation, i.e.
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