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18 Cards in this Set

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  • Back

SCLERENCHYMA

has both a primary wall and a thick secondary wall that is almost always lignified

PARENCHYMA

Thin primary walls. Typically alive at maturity. Has many functions

COLLENCHYMA

Unevenly thickened primary walls. Typically alive at maturity.


PROVIDES PLASTIC SUPPORT

Sclerenchyma

Plant tissue that is typically dead at maturity

Chlorenchyma


Glandular Cells


Transfer Cells

Types of parenchyma cells

Chlorenchyma

parenchyma cells involved in photosynthesis

Glandular cells

parenchyma cells that secrete nectar, fragrances, mucilage, resins, and oils ; they typically contain few chloroplasts but have elevated amounts of dictyosomes and endoplasmic reticulum.

Transfer Cells

parenchyma cells that mediate short distance transport of material by means of a large, extensive plasma membrane capable of holding numerous molecular pumps.

COLLENCHYMA

This plant tissue is present in elongating shoot tips that must be long and flexible, such as those of vining plants like grapes.

Collenchyma

Type of plant tissue that is usually produced only in shoot tips and young petioles, where the need for extra strength justifies the metabolic cost

Sclerenchyma cells

___________ develop from parenchyma cells in mature organs after they have stopped growing and have achieved their proper size and shape.

Mechanical sclerenchyma


Conducting sclerenchyma

Two types of sclerenchyma

Sclerids


Fibers

Types of mechanical sclerenchyma

Tracheids


Vessel Elements

Types of conducting sclerenchyma

Sclerids

Type of mechanical sclerenchyma that is more or less isodiametric. It is often dead at maturity.

Fibers

Type of mechanical sclerenchyma that are long, usually dead, but alive parts are usually involved in storage

Tracheids

Type of conducting sclerenchyma that is long and narrow with tapered ends, with no poriferations. Dead in maturity and found in vascular plants

Vessel Elements

Type of conducting sclerenchyma that are short and wide and with rather perpendicular and walls. Dead at maturity and is found among flowering plants exclusively (w/ the exception of ferns, horsetail, gymnosperms)