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Plant Organs
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Plant Tissues
Recall that a plant is made up of 4 types of
tissues:
Plant Tissues
Recall that a plant is made up of 4 types of
tissues:
 epidermal
 ground
 vascular
 meristematic
Plant Tissues
Recall that a plant is made up of 4 types of
tissues:
 epidermal (the “skin”)
 ground (the support)
 vascular (the transport)
 meristematic (growth)
Plant Organs
These tissues group together to form organs that
perform special functions.
Plant Organs
These tissues group together to form organs that
perform special functions.
These organs are the:
 roots
 stems
 leaves
 flowers
Roots
Roots
 anchor the plant in the soil
Roots
Roots
 anchor the plant in the soil
 collect water and nutrients from the soil
Roots
Roots
 anchor the plant in the soil
 collect water and nutrients from the soil
 store food
Roots
The centre of the root is made up of ground and
vascular tissue. The root is covered with protective
epidermal tissue ending in the root cap, below which
is a layer of meristematic tissue, which allows the
root to grow.
Stems
Stems
 support the leaves and flowers
 transport water and nutrients
Stems
Again, ground tissue provides the strength and support
while vascular tissue transports substances around,
and epidermal tissue provides a protective covering,
usually secreting a waxy substance known as the
cuticle to reduce water loss.
Leaves
Leaves
 photosynthesize (convert carbon dioxide and
water to oxygen and glucose sugar)
Leaves
The water and sugar are carried by the vascular tissues.
CO2 and O2 (and excess water) enter and exit through
openings in the epidermal tissue called stomata.
Most of the leaf is made of a specialized ground tissue
called mesophyll, which is where photosynthesis
occurs.
Respiration
Note that in order to use the energy stored in
glucose for cellular functions, the cells must
perform respiration:
glucose + oxygen  water + CO2 + energy
Respiration
Note that in order to use the energy stored in
glucose for cellular functions, the cells must
perform respiration:
glucose + oxygen  water + CO2 + energy
Remember:
Respiration is NOT breathing.
Plants use oxygen too (usually at night)!
Flowers
Flowers
 produce seeds through sexual reproduction
Flowering plants are called angiosperms.
To Do


Perform the dissection of a flower as outlined
on the handout
Answer questions #1 – 5 on page 60