Area of unspecialised cells within a plant that can divide and differentiate into other cell types
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What is an Organ?
Collection of tissues working together to carry out a function
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What is Phloem?
Tissue that carries products of photosynthesis, in solution within plants, from leaves to parts of the plant that don't photosynthesise e.g. roots, flowers and growing shoots
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What is Xylem?
Tissue that caries water and mineral ions from roots to all parts of the plant
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What is Epidermal Tissue?
Consists of flattened cells, forms a protective covering over leaves,stems and roots
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What is Vascular tissue associated with?
Transport
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What are the 2 types of Vascular tissue?
Xylem and Phloem
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What does meristematic tissue contain?
Stem cells
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Where is Meristematic Tissue found?
At root and shoot tips and in the cambium of vascular bundles
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Describe cells in meristems:
Have thin walls containing very little cellulose, don't have chloroplasts, don't have a large vacuole and can divide by mitosis and differentiate into other types of cells
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What is Lignin?
A woody substance deposited in cell walls to reinforce and water proof them- this also kills the cells
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Why do the ends of the cells break down?
So that Xylem forms continuous columns with wide lumens to carry water and dissolved minerals
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What Forms in Sieve Tubes?
Sieve Plates
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What is the Function of Companion cells?
Active loading of sugars into the sieve tubes
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What is the function of leaves?
To Photosynthesise
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What is the Functions of Roots?
Anchorage in Soil, Absorption of mineral ions and water
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What is the Function of Stems?
Support plant, transportation of water and minerals
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What is a stem cell?
Unspecialised cell able to express all of its genes and divide by mitosis
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What are Stem Cells described as?
Pluripotent
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What can Stem cells also do?
Divide By mitosis and provide more cells than can differentiate into specialised cells for growth an repair
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What are the 4 sources of Stem cells?
Embryonic stem cells, Umbilical cord blood, adult stem cells in developed tissues such as blood, brain , muscle bone tissue and skin and induced pluripotent stem cells developed in labs
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Examples of uses of Stem cells for growth and repair:
Treating type 1 diabetes. Bone-marrow stem cells to develop into liver cells (hepatocytes) which could be used to treat liver disease, stem cells into nerve cells to treat parkinsons or repair spinal chord injuries
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Other cards in this set
Card 2
Front
What is an Organ?
Back
Collection of tissues working together to carry out a function
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