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Lecture 5: Chapter 25
Structure and Organization of Flowering Plants
Professor: Dr. Barjis
Room:
P313
Phone:
(718)2605285
Email:
[email protected]
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Alberts, Bray,
Sylvia S Mader
Hopkins,
Johnson
General Biology
Outline
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Plant Organs
– Roots
– Stems
– Leaves
Monocots vs.
Eudicots
Epidermal Tissue
Vascular Tissue
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Roots
– Organization
– Diversity
Stems
– Organization
– Diversity
Leaves
– Organization
– Diversity
Plant Organs
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Roots function
– Anchors plant in soil.
– Absorbs water and minerals.
– Produces hormones that stimulate growth
and coordinate the plant size with their
root size
The root system contains primary root,
lateral root and root hair.
Organization of Plant Body
Stems
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Shoot system of a plant is the aboveground
portion of the plant.
The shoot system of the plant is composed
of the stem, the branches and the leaves.
– Stem support leaves in such a way that
each leaf is exposed to as much sunlight
as possible.
– In addition to supporting the leaves, a
stem has vascular tissue (Xylem and
Phloem)
Organization of Plant Body
Leaves
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Leaves are the major part of the plant that
carries on photosynthesis.
The process of Photosynthesis require:
– Water
– Carbon dioxide
– Sunlight
Plant Tissues
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Epidermal Tissues
– Is the outer protective covering of the
plant
Ground Tissue
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Ground tissue makes up the majority of the
interior of the plant
Vascular Tissue
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xylem and phloem
Xylem Structure
Root Diversity
Stem Diversity
Leaf
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The epidermis is covered by a waxy layer of
cuticle that reduces water loss.
Gas exchange occurs through tiny openings
in the leaf surface called stomates.
Regulation of gas exchange through the leaf
is the responsibility of the guard cells.
Organization of Leaves