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31 Cards in this Set
- Front
- Back
Anticlinal division |
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Periclinal division |
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middle lamella |
In plants, a thin layer of adhesive extracellular material, primarily pectins, found between the primary walls of adjacent young cells. |
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dermal tissue |
הרקמה החיצונית של הצמח |
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Ground tissue |
רקמת היסוד (רקמת המילוי)
•Tissues that are neither dermal nor vascular are the ground tissue system •Ground tissue internal to the vascular tissue is pith;ground tissue external to the vascular tissue is cortex • Ground tissue includes cells specialized for storage, photosynthesis, support, and transport |
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COLENCHYMA |
A flexible plant cell type that occurs in strands or cylinders that support young parts of the plant without restraining growth. |
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PARANCHYMA |
A relatively unspecialized plant cell type that carries out most of the metabolism, synthesizes and stores organic products, and develops into a more differentiated cell type. |
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Sclerenchyma cells |
part of the ground tissue. a rigid,supportive plant cell type usually lacking aprotoplast (which means he dead) and possessing thick secondary walls strengthened by lignin at maturity. |
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protoplast |
The living part of a plant cell, which also includes the plasma membrane. plant = protoplast + cell wall |
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sieve-tube element |
A living cell that conducts sugars and other organic nutrients in the phloem of angiosperms; also called a sievetubemember. Connected end to end, they form sieve tubes. no nuclei. |
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companion cell |
A type of plant cell that is connected to a sieve-tube element by many plasmodesmata and whose nucleus and ribosomes may serve one or more adjacent sieve-tube elements. |
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tonoplast |
A tonoplast is the membrane that surrounds the large vacuole in a mature plant cell. |
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pattern formation |
The development of specific structures in specific locations is called pattern formation. תכלס תהליך ההתמיינות בו כל תא מקבל תפקיד. |
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Protoderm |
a thin outer layer of the meristem in embryos and growing points of roots and stems, which gives rise to the epidermis. |
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Ground meristem |
The primary meristem in vascular plants that gives rise to the ground tissue. |
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Procambium |
The primary meristem in vascular plants that gives rise to primary vascular tissues (phloem and xylem). |
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Monocot |
חד פסיג |
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eudicot |
דו פסיג |
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endodermis |
In plant roots, the innermost layer of the cortex that surrounds the vascular cylinder. |
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pericycle |
The outermost layer in the vascular cylinder, from which lateral roots arise. meristem for root. |
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axillary bud |
ניצן חייקי A structure that has the potential to form a lateral shoot, or branch. The bud appears in the angle formed between a leaf and a stem. |
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apical dominance |
Tendency for growth to be concentrated at the tip of a plant shoot, because the apical bud partially inhibits axillary bud growth. |
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leaf primordia |
Leaves develop from leaf primordia along the sides of the apical meristem |
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pith |
Ground tissue that is internal to the vascular tissue in a stem; in many monocot roots,parenchyma cells that form the central core of the vascular cylinder. Cortex+ pith = ground tissue |
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Palisade mesophyll |
consists of one or more layers of elongated cells on the upper part of the leaf. do most of the Photosynthesis in the plant. |
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Spongy mesophyll |
a)The spongy mesophyll in the lowerpart of the leaf; the loose arrangement allows for gas exchange. |
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Guard cells |
The two cells that flank the stomatal pore and regulate the opening and closing ofthe pore. |
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cork cambium |
A cylinder of meristematic tissue in woody plants that replaces the epidermis with thicker, tougher cork cells. As the stem’s diameter increases, the outermost tissues exterior to the corkcambium rupture and are sloughed off. |
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cork |
שעם in secondary growth, replace the epidermis. |
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Bark |
consists of all tissues exterior to the vascular cambium. |
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Periderm |
consist of the cork cambium and the cork |