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.
Hydrometallurgy tutorial all along with the key concepts of meaning of hydrometallurgy, Processes of Hydrometallurgy and Advantages of Hydrometallurgy
tutorsglobe.com causes for monopoly assignment help-homework help by online monopoly tutors
www.tutorsglobe.com offers free trade and protection, restrictions on international trade assignment help-homework help, free economics tutorial by qualified tutor's help.
tutorsglobe.com consumer equilibrium by indifference curve assignment help-homework help by online indifference curve approach tutors
In Market Based Pricing - the transfer price will be ascertained as per to the market price prevailing in the market.
Fm detector is termed as discriminator. Fm detector is a balanced double diode demodulator. Fm detector splits audio signal from frequency modulated IF signal.
The ways by which unscrupulous directors can compute the financial statements are many and varied. Though, they generally include adopting novel or unorthodox practices for reporting main elements of the financial statements like revenue, expenses, assets and liabilities.
global system for mobile communications (gsm) is the very much popular standard for mobile telephony systems in the world.
Proton NMR tutorial all along with the key concepts of 1H-NMR Spectra, Spin-Spin Coupling, Signal Intensity, Deuterium Exchange, Interpretation of Proton NMR Spectra, Examples of 1H-NMR Spectral Interpretation
www.tutorsglobe.com offering finance homework help - finance homework assistance, solved finance homework questions, finance online tutoring, assignment help by online finance tutors - get solved homework questions.
Modes of Action of Antimicrobials tutorial all along with the key concepts of Antibacterial Agents, Antifungal Agents, Antiviral Agents, Antiparasitic Agents, Antiprotozoal Agents and Enzymes found only in parasites
free biology lecture notes, tutorials offer you to promote the understanding of the many various aspects of biology, and is recommended to be used in conjunction with the dictionary to assist with biological terminology
tutorsglobe.com capital budgeting and its importance assignment help-homework help by online capital budgeting and project planning tutors
tutorsglobe.com antigen antibody reactions assignment help-homework help by online immunology tutors
tutorsglobe.com pentose phosphate pathway assignment help-homework help by online plant physiology tutors
1942396
Questions Asked
3689
Tutors
1474978
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!