0
The sieve tube elements are specialized elongated cells in the phloem that connect end to end forming a tube. The main function of this tube is to transport nutrition in the form of carbohydrates. Sieve cells have no nucleus, ribosomes and cytoplasm, meanin they cannot carry out primary metabolic activities. The companion cells, which are closely associated with the sieve tube elements, carry out the their metabolic functions.
Wiki User
∙ 10y ago
Wiki User
∙ 15y agoin a sieve tube there are 13 conpanion cells border the sieve tube
Add your answer:
Earn +20 pts
The cells that function with the sieve tubes are the?
Cells containing sieve plates are called sieve tube members, a component of the phloem, which carries sugars produced in the leaves to various parts of the plant. They are characteristic of angiosperms (flowering plants) while gymnosperms (cone-bearing plants) have only sieve cells. Sieve cells and sieve tube members are collectively referred to as sieve elements.
What are the four basic types of tissues in plants?
ProtectiveProtective tissue covers the surface of leaves and the living cells of roots and stems. Its cells are flattened with their top and bottom surfaces parallel. The upper and lower epidermis of the leaf are examples of protective tissue XylemXylem conducts water and dissolved minerals from the roots to all the other parts of the plant. PhloemThe main components of phloem are sieve elements andcompanion cells.Sieve elements are so-named because their end walls are perforated. This allows cytoplasmic connections between vertically-stacked cells. The result is a sieve tube that conducts the products of photosynthesis --- sugars and amino acids --- from the place where they are manufactured (a "source"), e.g leaves, to the places ("sinks") where they are consumed or stored; such asrootsgrowing tips of stems and leavesflowersfruits, tubers, corms, etc.Sieve elements have no nucleus and only a sparse collection of other organelles. They depend on the adjacent companion cells for many functions.Companion cells move sugars and amino acids into and out of the sieve elements. In "source" tissue, such as a leaf, the companion cells use transmembrane proteins to take up --- by active transport --- sugars and amino acids from the cells manufacturing them. Water follows by osmosis. These materials then move into adjacent sieve elements by diffusion through plasmodesmata. The pressure created by osmosis drives the flow of materials through the sieve tubes.In "sink" tissue, the sugars and amino acids leave the sieve tubes by diffusion through plasmodesmata connecting the sieve elements to the cells of their destination. Again, water follows by osmosis where it mayleave the plant by transpiration orincrease the volume of the cells ormove into the xylem for recycling through the plant.
What are the main uses for tube heaters?
Tube heaters can be used in many different environments and places that need to be heated. Tube heaters can be places in walls or flooring in order to keep a room warm.
What substance would be expect if a test tube containing yeast glucose and water after 24 hours?
You just might get some CO2. (That's a gas.) The yeast cells will ferment the glucose in to ethyl alcohol and Carbon dioxide. The CO2 being in the gaseous form will diffuse in the atmosphere and in the test tube, ethyl alcohol in diluted form with water will be found.
What is another name for a test tube?
another name for test tube is culture tube or sample tube
Which of the plant cells have no nucleus?
Parenchyma, companion, sieve tube, & xylem cells have no nucleus. But, those are only the cells with out a nucleus that are fuctional.
What are 2 specialised plants cells?
Companion cell and Sieve tube cell. See the related links for more information.
What is the definition of companion cells in stems?
In the phloem of angiosperms, a nurse cell that is connected to, and is a sister cell to, an enucleate sieve tube member.
What is the conducting cell type in phloem?
The vast majority, 96-99 %, of the cells consist of bovina cellulose. Occasionally, particularly in southeast arabia, they may consist of silica as well. Sieve tubes, companion cell and phloem parenchyma.
What are phloem vessels made of?
Phloem consists for a sieve tube and a companion cell
The cells that function with the sieve tubes are the?
Cells containing sieve plates are called sieve tube members, a component of the phloem, which carries sugars produced in the leaves to various parts of the plant. They are characteristic of angiosperms (flowering plants) while gymnosperms (cone-bearing plants) have only sieve cells. Sieve cells and sieve tube members are collectively referred to as sieve elements.
What is the function of phloem cells?
A specialized parenchyma cell, located in the phloem of flowering plants and closely associated with the development and function of a sieve-tube element. Companion cells probably provide ATP, proteins, and other substances to the sieve-tube elements, whose cytoplasm lacks many structures necessary for cell maintenance.
What are sieve cells?
In plant anatomy, sieve tube elements, are a specialized type of elongated cell in the phloem tissue of flowering plants. The ends of these cells connect with other sieve tube members, making up the sieve tube, whose main function is transport of carbohydrates in the plant.
What are sieve-tube cells?
In plant anatomy, sieve tube elements, are a specialized type of elongated cell in the phloem tissue of flowering plants. The ends of these cells connect with other sieve tube members, making up the sieve tube, whose main function is transport of carbohydrates in the plant.
Do sieve cells have nucleus?
Seive cells have a nucleus.Seive tube elements do not have a nucleus.
What is the conducting cell in phloem tissue?
Sieve tube cells
What are the sugar-transporting cells in angiosperms?
sieve-tube elements
