Introduction to Anatomy of Dicot and Monocot Leaves
Leaves are extremely significant vegetative organs since they are largely concerned with transpiration and photosynthesis. Such as stem and roots, leaves also comprise the three tissue systems - ground, dermal, and vascular. The dermal tissue system contains a lower epidermis and an upper epidermis. Stomata take place in both the epidermis but more often in the lower epidermis. The ground tissue system which takes place among the epidermal layers of leaf is termed as mesophyll tissue. Frequently it is distinguished into spongy parenchyma on the abaxial that lower side and palisade parenchyma on the adaxial that is upper side.
A leaf displaying this separation in mesophyll is entitled as dorsiventral. It is general in dicot leaves. If mesophyll is not distinguished such as this in a leaf (that is made up of only spongy / palisade parenchyma) like in monocots, it is termed as isobilateral. The mesophyll tissue, particularly spongy parenchyma cells enclose lots of air spaces. The existence of air spaces is a unique characteristic of spongy cells. They make easy the gaseous exchange among the internal photosynthetic tissue (mesophyll) and the external atmosphere by the stomata.
The vascular tissue system is created of vascular bundles. Vascular bundles are collateral and closed. The vascular tissue creates the skeleton of the leaf and they are termed as veins. The veins supply minerals and water to the photosynthetic tissue. So the morphological and anatomical features of the leaf assist in the physiological functions of it.
Anatomy of a dicot leaf - Sunflower leaf
Inner structure of dicotyledonous leaves shows epidermis, mesophyll and vascular tissues.
Epidermis
A dicotyledonous leaf is usually dorsiventral. It has upper epidermis and lower epidermis. The epidermis is generally formed of a single layer of cells which are packed closely. The cuticle on the upper epidermis is thicker as compared to the lower epidermis. The minute openings that found on the epidermis are termed as stomata. Stomata are additional in number on the lower epidermis as compared to the on the upper epidermis. A stoma is surrounded through a pair of bean shaped cells termed as guard cells.
Diagram: T.S. of sunflower leaf
Every stoma opens into an air chamber. These guard cells consist of chloroplasts, while other epidermal cells do not consist of chloroplasts. The major task of the epidermis is to provide protection to the inner tissue termed as mesophyll. The cuticle assists to test transpiration. Stomata are employed for transpiration and gas exchange.
Mesophyll
The entire tissue among the upper and lower epidermis is termed as the mesophyll (Gk meso=in the middle; phyllome=leaf). In the mesophyll there are 2 regions. They are spongy parenchyma and palisade parenchyma. Palisade parenchyma cells are observed below the upper epidermis. It contains vertically elongated cylindrical cells in one or more than one layers. These cells are efficiently arranged with no intercellular spaces. Palisade parenchyma cells comprise more chloroplasts as compared to the spongy parenchyma cells. The task of palisade parenchyma is photosynthesis. Spongy parenchyma takes place below the palisade parenchyma. Spongy cells are unevenly shaped. These cells are arranged very loosely along with several airspaces. As compared to palisade cells, the spongy cells comprise lesser no. of chloroplasts. Spongy cells make easy the exchange of gases along with the help of air spaces. The air space which is found next to the stoma is termed as respiratory cavity / sub-stomatal cavity.
Vascular tissues
These are exists in the veins of leaf. Vascular bundles are collateral , conjoint, and closed. Xylem is exists in the direction of the upper epidermis, when the phloem in the direction of the lower epidermis. Vascular bundles are surrounded through a compact layer of parenchymatous cells termed as bundle sheath / border parenchyma. Xylem contains protoxylem vessels and metaxylem vessels. Protoxylem vessels are exists in the direction of the upper epidermis. Phloem contains sieve tubes, phloem parenchyma and companion cells. Phloem fibres are not present. Xylem contains vessels and xylem parenchyma. Tracheids and xylem fibres are not present.
Latest technology based Biology Online Tutoring Assistance
Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in Anatomy of Dicot and Monocot Leaves homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for Anatomy of Dicot and Monocot Leaves, project ideas and tutorials. We provide email based Anatomy of Dicot and Monocot Leaves homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in Anatomy of Dicot and Monocot Leaves. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Biology homework help and assignment help services. They use their experience, as they have solved thousands of the Biology assignments, which may help you to solve your complex issues of Anatomy of Dicot and Monocot Leaves. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.
tutorsglobe.com ureotelism assignment help-homework help by online excretion tutors
Stop the apprehension of looming deadlines and avail top-rated Modern Physics Assignment Help at low prices and score high!
Resistivity Method tutorial all along with the key concepts of Survey Fundamentals, Electrode arrays, Array descriptions, Wenner array, Schlumberger array, Dipole-dipole (Eltran) array, Lee array, Signal-contribution sections, Depth penetration
theory and lecture notes of business cycle indicators all along with the key concepts of business cycle indicators, consumption, globalization, monetary policy, inventories. tutorsglobe offers homework help, assignment help and tutor’s assistance on business cycle indicators.
tutorsglobe.com externalities-open access and public goods assignment help-homework help by online intermediate microeconomics tutors
Importance of Soil and Plant Tissue Analysis tutorial all along with the key concepts of Plant Tissue Analysis - Nutrient Concentration, Plant-Stalk Nitrate, Application of Plant Analysis, Application of Soil Analysis, Plant, Soil and Water Relationship, Soil Depth and Layering
Improving corporate governance has tended to focus on developing a framework of rules. Whilst rules are important, it is also important for shareholders to play their part by actively monitoring and controlling the behaviour of directors.
tutorsglobe.com complement system assignment help-homework help by online natural immunity tutors
Are assignments giving you nightmares? Get top-rated Astrophysics Assignment Help service from PhD experts and score well.
Classification of Multicellular Animals tutorial all along with the key concepts of Parazoa-Phylum Porifera, Classification of Phylum porifera, Phylum Cnidaria, Coral Reefs, Phylum Ctenophora, Kinds of Coral Reefs
Structure and Function of Membranes tutorial all along with the key concepts of Structure of Membranes, Functions of Membranes, Movement of Water through Membranes, Water Potential, Osmosis and Turgor
Pauli’s Exclusion Principle-the Hund’s Rule tutorial all along with the key concepts of Pauli's exclusion principle, Hund's rule, Atomic radius, Properties of Monatomic Lons
build up a 3 phase, single layer concentric type of winding for a 2 pole ac machine comprising 12 slots.
tutorsglobe.com perianth assignment help-homework help by online position of flower tutors
tutorsglobe.com mycorrhiza assignment help-homework help by online biofertilizer tutors
1952179
Questions Asked
3689
Tutors
1492683
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!