which one of the following is an example for sub aerial modification of stem?
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Underground stems of potato, ginger, turmeric, zaminkand, Colocasia are modified to store food in them. They also act as organs of perennation to tide over conditions unfavourable for growth.
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Auxins promote stem elongation, inhibit growth of lateral buds (maintains apical dominance). They are produced in the stem, buds, and root tips. Example: Indole Acetic Acid (IA). Auxin is a plant hormone produced in the stem tip that promotes cell elongation.
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Jute has to be retted to separate the long strands of fibre from the stem.
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The key difference between stem tendril and leaf tendril is that stem tendril is a modified stem while leaf tendril is a modified leaf, leaflet or a leaf part. Tendril is a modified stem, leaf or petiole that is thread-like in shape. Tendrils mainly provide support for climbing parts.
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Stem Anatomy The three major internal parts of a stem are the xylem, phloem, and cambium.
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Weak stems are the result of overly rich soil. Sedum plants are tolerant of poor growing conditions and even thrive in sandy or gritty medium. Rich and soggy soils will cause the stems to bend and you will see your sedums falling over.
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Terrestrial plants have root and shoot systems. The types of roots are taproot, fibrous and adventitious. Shoot system includes stem, leaves and flowers. Leaves and stems are classified as vegetative parts of a plant while flowers and fruits are reproductive parts.
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['They lose their end walls so the xylem forms a continuous, hollow tube.', 'They become strengthened by a substance called lignin . Lignin gives strength and support to the plant. We call lignified cells wood.']
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A stem and leaf is a table used to display data. The 'stem' is on the left displays the first digit or digits. The 'leaf' is on the right and displays the last digit.
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The thickening of the stem that occurs in secondary growth is due to the formation of secondary phloem and secondary xylem by the vascular cambium, plus the action of cork cambium, which forms the tough outermost layer of the stem. The cells of the secondary xylem contain lignin, which provides hardiness and strength.
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Rhizomes, tubers, bulbs and corms are actually underground stems, not roots. These underground stems are storage containers for the plant. Rhizomes are stems that grow horizontally, but rhizomes grow underground and generally have a thickened stem that is used for storage.
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Shoot refers to new plant growth, whether it is a stem, a leaf, or even a flower. Stems are usually above ground, but there are some plants that have stems underground, such as bulbs or tubers. Stems usually have branches and leaves. Stems are generally round like a stick and may be herbaceous or woody.
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Examples of plants propagated by simple layering include climbing roses, forsythia, rhododendron, honeysuckle, boxwood, azalea, and wax myrtle. Simple layering can be done in early spring using a dormant branch, or in late summer using a mature branch.
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Blueberries are going for the sky. The tree was not created via modification at the genetic level, either by adding or silencing parts of genes, but via a technique commonly used in hybridization programs for trees: root grafting.
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Growth in Stems The increase in length of the shoot and the root is referred to as primary growth. It is the result of cell division in the shoot apical meristem. Secondary growth is characterized by an increase in thickness or girth of the plant. It is caused by cell division in the lateral meristem.
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Propagating from cuttings Many cacti can be propagated successfully by stem cuttings. Stem cuttings are taken from an existing plant, then allowed to dry and callous. The cuttings will eventually start rooting from the cut end and start growing as a new plant.
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['substitution of forest areas with cultivations and breeding.', 'timber extraction.', 'firewood collection.', 'road and infrastrucutre construction.']