Transcript ROOTS AND STEMS

ROOTS AND STEMS
What is their role in
photosynthesis?
Functions of Roots
The primary functions of roots are:
1) to anchor the plant
(tap root vs. fibrous root)
2) to absorb water and minerals
(root hairs can penetrate spaces
between soil particles)
3) to store nutrients
(ex. carrots and sweet potatoes store
carbohydrates)
ROOTS
What is the
difference
between
primary
roots and
secondary
roots?
Primary roots
are the initial
roots that grow
from a seed.
Secondary roots
branch out from
the primary root
Tap root vs. Fibrous root
the primary root grows longer and
thicker than the secondary roots
the secondary roots continue to
grow, and eventually all the roots
are of equal or nearly equal size
How do these root
parts help with
photosynthesis?
Functions of Stems
The primary function of stems is to:
1) transport water and dissolved minerals
from the roots to the leaves and, at the
same time, to transport food from the
leaves to the rest of the plant.
2) Stems may also function as food storage
areas, supporting structures, and places
for the growth of new plants.
Vascular Tissue in Stems
Monocot
Dicot
(named for how many seed leaves
are present in an embryo plant-ONE)
(named because the embryo within
Vascular bundles are scattered
throughout
a dicot seed contains TWO leaves)
Vascular bundles are found in a
circular pattern
Vascular tissue contains the xylem and the phloem
The xylem and the phloem have the same function in the stem as they do in
the leaf – what is their function?
VASCULAR TISSUE
Xylem= transports water
in a plant
Phloem= transports
food (sugar)
throughout the plant
Woody Stems vs.
Herbaceous Stems
Woody stems are
hard and often
turn brown yet
they grow bigger
year after year.
Herbaceous
stems are soft
and remain
green for the life
of the plant.
How do these stem
parts help with
photosynthesis?
Tree Rings
What do they tell us?