Define or explain the following terms-
1)Xylem
2)Tracheids
3)Vessels
4)Xylem parenchyma
5)Xylem fibres
6)Phloem
7)Sieve tubes
8)Companion cells
9)Phloem parenchym
10)Phloem fibres
Answers
Answer:
1) A compound tissue in vascular plants that helps provide support and that conducts water and nutrients upward from the roots, consisting of tracheids, vessels, parenchyma cells, and woody fibers.
2)a type of water-conducting cell in the xylem which lacks perforations in the cell wall.
3)vessel element or vessel member is one of the cell types found in xylem, the water conducting tissue of plants. Vessel elements are typically found in flowering plants (angiosperms) but absent from most gymnosperms such as conifers.
4)Xylem parenchyma is an element of complex tissue called “Xylem”. Parenchyma cells of xylem are mainly involved in the storage of carbohydrate, fats and water conduction.
5)Xylem fibres are called as wood fibres. They provide mechanical support to the xylem as well as the whole plant. They are thick, lignified, dead cells.
6)Phloem is the living tissue in vascular plants that transports the soluble organic compounds made during photosynthesis and known as photosynthates, in particular the sugar sucrose, to parts of the plant where needed. This transport process is called translocation.
7)a series of sieve tube elements placed end to end to form a continuous tube.
8)companion cell A type of cell found within the phloem of flowering plants. Each companion cell is usually closely associated with a sieve element. Its function is uncertain, though it appears to regulate the activity of the adjacent sieve element and to take part in loading and unloading sugar into the sieve element.
9)Phloem parenchyma cells, called transfer cells and border parenchyma cells, are located near the finest branches and terminations of sieve tubes in leaf veinlets, where they also function in the transport of foods.
10)Bast fibre (also called phloem fibre or skin fibre) is plant fibre collected from the phloem (the "inner bark", sometimes called "skin") or bast surrounding the stem of certain dicotyledonous plants. They support the conductive cells of the phloem and provide strength to the stem.
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1. compound tissue in vascular plants that helps provide support and that conducts water and nutrients upward from the roots, consisting of tracheids, vessels, parenchyma cells, and woody fibers.
2. An elongated, water-conducting cell in xylem, one of the two kinds of tracheary elements. Tracheids have pits where the cell wall is modified into a thin membrane, across which water flows from tracheid to tracheid. ... Tracheids are found in all vascular plants.
3. vessel. ... Each one is a type of vessel. A vessel can be a ship, a container for holding liquids, or a tube that transports blood throughout your body. Vessel has a number of different meanings, yet all of them relate in some way to liquids and transportation.
4. xylem parenchyma. live plant cells that are short, lignified and generally thin walled. They surround conducting elements and assist directly or indirectly in the conduction of water upwards through vessels and tracheids, and also serve for food storage.
5. The xylem fibers are non-living sclerenchyma cells as they lose their protoplast at maturity. These cells are found in between the tracheids and xylem vessels of the xylem tissue. Sclerenchyma cells are narrow and elongated cells with tapering ends. They are former parenchyma cells that developed secondary cell walls.
6.Phloem is the vascular tissue responsible for the transport of sugars from source tissues (ex. photosynthetic leaf cells) to sink tissues (ex. non-photosynthetic root cells or developing flowers). Other molecules such as protein are also transported throughout the plant via phloem.
7.Sieve tubes are elements of phloem. They are slender, tube-like structures composed of elongated thin-walled cells, placed end to end. The main function of sieve tubes is to transport sugars and nutrients up and down the plant
8.companion cell A type of cell found within the phloem of flowering plants. Each companion cell is usually closely associated with a sieve element. Its function is uncertain, though it appears to regulate the activity of the adjacent sieve element and to take part in loading and unloading sugar into the sieve element
9.Phloem parenchyma cells, called transfer cells and border parenchyma cells, are located near the finest branches and terminations of sieve tubes in leaf veinlets, where they also function in the transport of foods.
10.Bast fibre (also called phloem fibre or skin fibre) is plant fibre collected from the phloem (the "inner bark", sometimes called "skin") or bast surrounding the stem of certain dicotyledonous plants. They support the conductive cells of the phloem and provide strength to the stem