Leaf
Morphology:
The leaf, in the extensive logic of the period, is extremely veriable in both structure and function. The foliage leaf usually shows it specialization as a photosynthetic organ by the consumed level method of its blade, the lamina. The blade may b attached to the shoot by the petiole, or leaf may b without a petiole if the base of both a sessile or a petiolate leaf encloses the stem, it is reffered to as a sheathing base.
Sometime the sheathing part of the leaf is developed into a conspicuous leaf sheath. Outgrowth at the base of the leaf, the stipules, are often present in leaves associated with trilacuner nodes. A simple leaf has one blade a compound leaf has two or more leaflet blades attached to a common axis, the rachis. The leaflets may b compound.
Epidermis:
The highest landscapes of the leaf epidermis are compressed organization of cells and the occurrence of cuticle and stomata. The stomata may take place on equally sides of the leaf or only on one side, either on the upper or most coomonly , on the lower side. In the wide leaves of dicotyledons the stomata are spread. In the contracted lengthened leaves distinguishing of monocotyledons and conifers, the stomata occur in rows comparable with long axis of the leaf.
The stomata may b on the similar level as the other epidermal cells, or they may be placed exceeding the outward of the epidermis or beneath it. Numerous stomata may give the impression in a downheartedness called stomatal crypt. The crypts usually threatened by trichomes, possibly comprise a moist atmosphere.
Mesophyll:
The central part of the ground tissue of a leaf blade is the mesophyll...
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... side of the metaxylem. Accessory transfusion tissue composed of elongated parenchyma cells and tracheids with bordered pits is present. Both kinds of cells appear to be in contact with intercellular spaces.
The ginkgo leaf is wide at the apex and narrow at rhe base. It has numerous dichotomously branching veins. The epidermis has relatively thin walls and hypodermal sclernchyma is absent. The guard cells are slightly depressed and occur only on the abaxial side.
There is a single palisade layer of rather short lobed cells and below it is the spongy parenchyma. Each of the numerous vascular bundles has a uni-seriate lignified endodermis. Tannis are often abundant in the endodermal sheath especially in the small bundles.
A few transfusion tracheids flank the xylem of each bundle. The vascular bundles alternate with mucilage ducts
It is much thicker than the epidermis and contains collagen, reticular and elastic fibers, and is vascular. The area where the dermis meets the epidermis is unique in that the epidermis contains ridges at the stratum basale layer which interlocks with the dermal papillae, which are upward projections, like waves, on the uppermost surface of the dermis. The dermis had two sublayers. The papillary layer is in the dermal papillae and near it and is made up of areolar tissue. The reticular layer is dense irregular connective tissue that is found at the basal end of the dermis and contains collagen and adipose
They are used to produce glucose which is used as plant food and growing materials (e.g. cellulose).A leaf which is exposed to plenty of light will have sufficient amounts of food and will not need an excessive amount of chlorophyll. This enables the leaf to have a small surface area. It is also necessary for leaves in areas of high light intensity, and thus high temperature, to have small leaves to reduce the amount of transpiration. The heat will cause water to evaporate a lot faster. Leaves in shaded areas will need a large surface area full of chlorophyll to collect as much sun light as possible; essential for survival.
to this rigid structure of the plants and so, it is very useful as a
A plethora of names have been handed down to the common dandelion. The leaves of the dandelion appear shiny and are without hairs. The margin of each leaf is cut into great jagged teeth, either upright or pointing somewhat backwards. The attachments are somewhat fanciful to the resemblance of the canine teeth of a lion, giving the plant its most familiar name of "Dandelion," (AAE, 1995)
As a result of these factors, the flora has adapted to these conditions in a variety of ways including their shape, leaf type, root system, and color. One of the most prominent adapt...
In this laboratory experiment, the rate of photosynthesis was measured through the use of the “floating leaf disk technique.” The leaf disks were placed into a syringe and the O2 and CO2 in the mesophyll layers of the leaves were removed and then replaced with sodium bicarbonate or water, causing the leaves to sink to the bottom of the container. If one determines the number of leaf disks rising to the top as a result of an increase in oxygen gas in the mesophyll cells, then the rate of photosynthesis is able to be measured because O2 is a product of photosynthesis. The first step of this experiment was a feasibility study of the variance in the photosynthetic activity of the leaf disks in both water and bicarbonate solutions. After five minutes of light exposure, all of the leaf disks in the bicarbonate solution (10 disks) had ...
Here is where serous fluid is secreted by the pleural membranes lubricating the inside of the pleural cavity therefore stopping possible irritation to the lungs during respiration. The lung is shaped like a cone-shaped, the superior end of the lung that forms the point and the inferior end at the base. The apex is found at the superior end of the lungs. And the inferior end known as the base rests on the diaphragm. The base of the lungs is concave which follows the contour of the diaphragm.
which make up the sweat glands in the skin and the mucus also lines the passageway inside the lungs,
two pleural lobes on the sides. The three main parts of it's body are called the
Two members of the group were instructed to visit the laboratory each day of the experiment to water and measure the plants (Handout 1). The measurements that were preformed were to be precise and accurate by the group by organizing a standardized way to measure the plants. The plants were measured from the level of the soil, which was flat throughout all the cups, to the tip of the apical meristems. The leaves were not considered. The watering of the plants took place nearly everyday, except for the times the lab was closed. Respective of cup label, the appropriate drop of solution was added to the plant, at the very tip of the apical meristems.
The epidermis, which is the outer layer of the skin, is made up of four to five layers in some parts (Shier, Butler, & Lewis, 2009). In the majority of the areas, just four layers can be differentiated: the stratum basale, stratum spinosum, stratum granulosum, and stratum corneum (p.119). Another layer is the stratum lucidum which can be found in the thicker part of the skin of the palms and ...
List the embryonic germ layers that the epidermis and dermis are derived from (be specific for the dermis). (2 points)
Cotton is an annual, biennial or perennial plant, but in cultivation it is generally treated as an annual; herbaceous to short shrub or small tree - two to six feet tall. It consist of a primary axis, erect and branched with a vegetative lower zone having monopodial branches, and a fruiting upper zone with sympodial branches. The leaves of the cotton plant alternate, cordate petiolate, three to nine lobed and palmately veined, with varying size, texture, shape and hairiness. The large, showy, cream yellow, red or purple flowers are extra axillary, terminal, solitary, and borne on sympodial branches. The calyx (= collectively the sepals) consists of a very short cup-shaped structure at the base of the corolla. The five petals of the corolla are either free or slightly united at the base of the convoluted bud (Sundararaj, 1974).
Formation of germ layers is the first step towards multicellular organisms. It establishes division of tissue types. Diploblastic organisms, such as coelenterates, have two germ layers (ectoderm and endoderm), whereas triploblastic organisms, which include all higher animals, have three germ layers (ectoderm, mesoderm and endoderm). These germ layers are often termed as leaves with ectoderm being the outer leaf, mesoderm being the middle leaf...
The reproductive system was mainly located towards the anal area and inferior to the stomach. The penis was located in the middle. It was white in color and looked like a mealworm. The seminal vesicles were located on both sides of the penis. They were grayish pink in color and looked like walnuts.