ANGIOSPERMS are divided into two major classes: MONOCOTY LEDONS DICOT YLEDONS Have only ONE COTYLEDON Have TWO COTYLEDON
DID YOU KNOW THAT COFFEE BEANS ARE SEEDS TOO!?
THERE ARE TWO TYPES OF ROOTS:
Mainly found in DICOTS. In this case, one has a single root growing vertically down into the soil from which lateral roots come out. TAP ROOTS
Found in MONOCOTS. In this case, several roots grow out at the same time, and laterals grow from them. FIBROUS ROOTS
ABSORPTION OF WATER
XYLEM PHLOEM CORTEX ROOT HAIR EPIDERMIS
The STEM of a plant is that structure that is usually erect and found above the ground . It usually has leaves at regular intervals and a terminal bud at the growing point .
NODE LATERAL BUD
MONOCOT DICOT THERE ARE TWO TYPES OF STEMS:
Z ea mays IN MONOCOTS LIKE MAIZE THE VASCULAR BUNDLES ARE SCATTERED THROUGHOUT THE STEM TRANSVERSE SECTION THROUGH A YOUNG MAIZE STEM
1 EPIDERMIS3 SCLERENCHYMA CAP4 PHLOEM5 XYLEM2 CORTEX6 PITH CROSS-SECTION THROUGH A dicot STEM sunflower
THE INTERNAL STRUCTURE OF THE STEM
THE INTERNAL STRUCTURE OF THE STEM EPIDERMIS VASCULAR BUNDLE CORTEX AND PITH CAMBIUM
PLANT EPIDERMIS EPIDERMIS WAXY CUTICLE
THE VASCULAR BUNDLES
THE VASCULAR BUNDLES
xylem Carries water and minerals up to the stem. Water is done by OSMOSIS whilst Minerals by ACTIVE TRANSPORT The XYLEM transports only in one direction ... which way? UP or DOWN? WHY which way? UP or DOWN? WHY which way? UP or DOWN? WHY which way? UP or DOWN? WHY which way? UP or DOWN? WHY which way? UP or DOWN? WHY which way? UP or DOWN? WHY which way? UP or DOWN? WHY which way? UP or DOWN? WHY
phloem Carries sugars produced by the process of ___________ Q: Do the roots need Sugar (food) ? For what? Q: Do flowers need Sugar? Q: So in what direction is sugar translocated (transported) inside the Phloem?
CORTEX CORTEX is layer is the food storage system of the root, called packing tissue . It is also found in the stem.
PITH PITCH is the CENTRAL tissue of the stem These tissues serve also as supporting tissue and contribute to the stem’s rigidity.
CAMBIUM CAMBIUM is a thin layer of cells, which separates the xylem from the phloem . These cells can divide, thus increasing its diameter of the stem, known as Secondary thickening. XYLEM PHLOEM