Scribe Post 3-12-12

Today in Class We:

~Watered and Measured Fast Plants

~Notes (Ch. 28: Flowering Plants)

Know Monocots vs. Dicots for Lab!!

*Memorize these characteristics below*

Roots: Root hairs-increase

surface area of root for

absorption.

Large taproots - store food

such as starch for plant (Ex:

carrots, turnips, sugar beets,

sweet potatoes................................Monocot Root --->

<--- Dicot Root

.................................................................................................................................

Stems - Terminal bud is at apex of stem

when plant stem is growing in length.

Axillary buds, in angle formed by a leaf

(and stem) are dormant.

Terminal bud produces hormones

inhibiting growth of axillary buds = apical

dominance, so plant can grow up to sun.

Axillary buds begin growing and develop

into branches under certain conditions.

Types of Stems

Runner in a strawberry plant = horizontal

stem - new plants emerge from tip of

runner = asexual reproduction

Rhizome of an iris plant =horizontal

underground stems = store food, & can

bud new plants

Tubers are rhizomes ending in enlarged

structures (potatoes). Eyes of potato are

axillary buds, can grow when planted.

Leaves - flat blades (for light collection) and

petioles (joins leaf to stem.) Celery is a big

petiole.

Tendrils = modified leaves for climbing

and support .

Spines of a cactus = modified leaf parts

protecting plant. Cactus stem is

photosynthetic.

2 Plant Vascular Tissues:

1. Xylem - contains water conducting cells -

move water & minerals up stem

2. Phloem -contains food conducting cells -

transport sugars from leaves or storage tissue

to other parts of plant

3 Tissue Systems continuous throughout

plant:

1. Dermal-covers, protects, waxy coating

(epidermis)

2. Vascular- xylem and phloem; support,

transport

3. Ground - bulk of young plant, fills spaces

between epidermis and vascular.

Photosynthesis, storage, support.

Types of ground tissue:

Cortex - in root,cells store food, take up

water & minerals.

Endodermis - selective barrier in cortexdetermines which substances pass between

cortex and vascular tissue.

Pith - fills center of stem in dicots, food

storage.

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