what is meant by secondary thickening meristem? is it applicable to all plants?
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Some Monocots have a Lateral Meristem called the Secondary Thickening Meristem which produces Secondary vascular tissues. Examples of STM are Aloe Dracaena Cyperus Yucca.
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Hey its like asking the average volume of water while washing the dishes. By this I mean they vary and unless you have a static mass of a plant you might have your dedusion.\n\nThis depends on the height and age or stage of a plant during growth.\n\nLike come to think of the seed. While germinating the water from the cotyledon is used up rapidly which couses an imbalance but when the radical form, the variability changes so it all depends.
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Primary Growth: Apical meristem is responsible for primary root and stem growth in vascular plants.\n \nPrimary Root Growth: is concentrated near the tip and results in the root growing in length. The root tip contains 4 zones of development: The root cap, which protects the area behind it and softens the soil ahead of it by producing a polysaccharide. The apical meristem, is an area of rapidly dividing cells. It will replace the cells of the root cap as they wear away and push cells above them that will develop into the main tissues of the plant. The zone of elongation, is an area where the cells elongate 10 times their original length. This elongation helps push the root into the soil. The zone of maturation, is the area farthest from the root tip. Here the new cells will specialize and carry out the functions of the epidermal, ground, and vascular tissue. The primary tissues in a dicot root are arranges in a central x pattern for the xylem with the phloem located in each of the angles of the xylem. In a monocot the vascular tissues are alternated in a circle.\nPrimary Stem Growth: begins at the tip of the terminal bud in the area called the apical meristem. The cell divisions are responsible for the stem's growth in length. The primary vascular tissue in monocots takes on a scattered arrangement. In a dicot, it takes a circular pattern.\n \nSecondary Growth: Increases the girth of a stem it is caused by the vascular and cork cambium.\n \nVascular Cambium: meristematic parenchyma produces xylem on the inside and phloem on its outer side. The secondary xylem accumulates and forms the wood. The secondary phloem does not accumulate and is sloughed off with the bark.\nCork Cambium: forms in the outer cortex. Produces cork and epidermal tissues.\nWood has 2 zones: Heartwood- the older (inner) layers of xylem blocked with resins. It is non -functional in water transport. Sap wood- outer xylem, vascular cambium, phloem and cork cambium. Conducts water and food.
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As a plant grows up ward it bears leaves on the sides of the upright stem.In the axile of every leaf( the point where the leaf stalk is attached to  the stem.), there is an axillary bud.This bud IS THE STARTING POINT OF A NEW BRANCH.\nAs long as the main stem continues to grow actively these axillary bud are dormant.But when the main stem stops growing or becomes slow in its growth, the axillary buds are activated by certain growth hormones that are produced naturally in the pant and the meristem tissue(embryonic or formative tissue) inside the buds begin to multiply and gradually begins to develop in to a side branch. It may be an ordinary vegetative branch like the main stem itself or a flowering branch.It depends upon the season,the age of the plant and the type of the hormone.\nIn Nutshell: In plants the branches develop from the meristem tissue.They are present in the buds and activated by hormones.\nFor more than this get hold of a proper botany book ( anatomy book) and study yourself.
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Common Burdock: Burs are much smaller and stalks are shorter (burs are closer to the stem); the stalks of the lower leaves are hollow, not grooved and the plants themselves do not grow as tall\n\nGreat: The burs are large - up to almost 4cm and the stalks are long; stalks of lower leaves are solid and grooved on the upper surface; grows taller in general
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New buds push off old leaves and new buds begin forming in the fall.  Some species have big buds and others smaller buds.  All buds begin to swell in the spring just before the buds begin bursting, which pushes off any remaining leaves still attached.\n\nWith some species (maple and beech and surely others), the new bud developed in the fall simply doesn't push the leaves off until they begin swelling in the spring.\n\nThere is a term for this, but I don't remember it.
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No. In fact not every one of them. The cells which make up the roots of the plants do not because they are not designed for the process of photosynthesis.
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1)Roots\n are usually below ground and lack nodes, shoots, and leaves.  \nThey absorb NUTRIENTS and water from the soil\nanchor the plant in the soil, providing support for the stem\noften store food\nThe greatest number of plant roots are in the top foot of soil, with major feeder roots occurring in the top six inches. This knowledge is important for IRRIGATION, FERTILIZATION, and CULTIVATION. The amount and location of roots may be influenced by soil characteristics.\n\n2)Stems are generally upright and above ground, easy to locate and identify. However, many stems grow below ground or are ground-hugging. A modified stem is recognizable because it includes buds and sometimes leaves.  \nBuds and shoots generally develop on stems.\nThey carry nutrients and water from the roots to the other parts of the plant.\nIn some cases, stems also store food. \n\n3)Nodes are places on the stem where leaves are attached and buds form.\nRoots often form at nodes of creeping plants and when cuttings are taken for propagation.\nInternodes are the segments of the stem between nodes.\n \nThe quality and amount of available light and temperature affect the length of the internode. The distance between nodes can be long or short. This distance reflects growing conditions. Plants grown under poor light conditions may be spindly, with very long, thin, and weak internodes. \n\n\n4)Leaves are lateral outgrowths from the stem, most commonly flat, broad, and green. This maximizes their function of absorbing sunlight and transforming it into food. Leaves have evolved into many shapes and sizes, reflecting adaptations to the environment. Leaves generally consist of a stalk or PETIOLE and a blade or LAMINA. In simple leaves the lamina is in one piece. In compound leaves several pieces of lamina are joined to one petiole. \n\n\n5)Buds are undeveloped shoots and flowers. Buds are classified terminal or lateral. Another term for terminal is apical. Terminal buds can be identified by their location at the tip of a stem. Lateral buds are located at the sides of the stem.\n\nFlower buds are normally larger than VEGETATIVE buds. Cabbage and head lettuce are examples of very large terminal buds. Brussels sprouts are edible lateral buds. Broccoli is an example of edible flower buds.  \n\n\n6)The function of flowers is sexual reproduction through the production of seeds. A flower that has both male and female parts is called a perfect flower. Flowers that have only male or only female parts are called imperfect. A complete flower has four kinds of structure. Sometimes petals or stamens may be converted to nectaries so that it appears that there are other structures present. If a flower lacks one kind of structure it is said to be incomplete. The structures are arranged from the outermost inwards: The calyx is often green (but may be colored) and made up of two or more sepals  \n    The corolla is often colored (but may be green) and made up of petals  \n    The stamens are the male portion of the flower. Each consists of an anther, containing pollen supported by a stalk or filament  \n    Pistils (there may only be one) are the female part. Each includes one or more ovaries where seeds will form, a stigma that captures and holds pollen, and a style that supports the stigma on the ovary. \n\n\n7)A fruit is a ripened ovary or group of ovaries containing the seeds. It may include adjacent tissue that fuses with the ovary. Once the ovary is fertilized, the seeds develop and the ovary enlarges forming the mature fruit.  simple fruit forms from the ripening of the ovary of a single pistil. Examples include peanuts, sunflower seeds, grain (corn, barley, rice), acorns, walnuts, tomatoes, grapes, eggplants, citrus fruits, and apples.  \n    Aggregate fruit form from flowers with several simple pistils, such as raspberries and strawberries.  \n    Multiple fruit forms from a cluster of several flowers. A fruit is produced by each flower and these fruits merge into a multiple
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root, stem, leaf and flower
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There isn't a "species", because Aloe vera is itself the species you are asking about. However, I have seen some varieties of it with hardly any spikes along the leaf edges. In part, I think this may happen when it is growing rapidly in length. I don't know specifically how to encourage this kind of leaves, but looking for an individual with this type of leaves might work for you? Also, look for a representative with FAT leaves, and they won't seem as spiky.
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Planter!!!\nCheck the second image down on this web page:
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No. \nGeophytes are those plants that have their growing buds below the ground. They usually have parts modified as storage organs (roots and stems forming bulbs, rhyzomes, etc) and are able to undergo unfavorable periods by staying within the soil, with their buds well protected. Thus, they're perennial.\nOn the contrary, terophytes are annual plants. These are usually grasses and forbs, plants that quickly grow, produce flowers and many seeds, and then die with the onset of unfavorable conditions. They don´t have storage organs, because they do not rely on resistance, but rather on producing many offspring that will grow in the next favorable season.
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http://www.ext.vt.edu/pubs/plantdiseasefs/450-604/450-604.html
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There are many examples of those modified structures. \nHere are some examples, I hope you can look for more. \nModified leaves: the thorns of roses or cactuses, modified for defence.\nModified stems: potatoes, modified for storage.\nModified roots: mangroves use some of their roots for breathing; the aereal roots of orchids absorb water from the air.\nSome structures such as tendrils or thorns  may be derived from leaves or stems.\nAnd lastly, flowers are thought to have evolved from modified leaves too.
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Because is a part of a plant and the apparatus of Golgi is an animal structures. They are not cloroplast because it is a root.
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Yes I do. It is when a potted plants/flowers roots are growing to big for the current planter it is in. You just need to replant it in a larger pot!!
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Thru the hyperdeminsional cell structure of the base fiber lead in that causes the hermitcis percillium to react in an osmosis retention and propolsion effect which dilutes the potended ethylene compond saturation, and therefore transforms the base ethephon into active ingredient ethylene. \n\nGood question, \n\nDarryl S.