Presentation featuring plants biology. Grades 6-12.

1. PLANT ORGANS AND TISSUES
Reginald Finley Sr

2. • There are now more than 400,000 known species
of plant. The flowering plants (angiosperms) are
by far the most diverse and widespread group of
land plants.
• Plants have structural and physiological
adaptations that help them survive in a wide
variety of environments.
Introduction

3. • Scientists tend to divide all plants into two large
groups: The Bryophytes and the Tracheophytes.
Two Main Plants
Bryophytes include: mosses, liverworts, and hornworts
Tracheophytes include: ferns, pines, and flowering plants
• Bryophytes are considered nonvascular which
means that they don’t have specialized tissues to
transport water and nutrients. Tracheophytes are
called vascular because they do!

4. • Roots:
– Roots anchor and support the plant. It also
provides water and dissolved nutrients from the
soil. They also provide food and store water.
– Most absorption of water and minerals is done
at the root tips where tiny root hairs increase
surface area. The root tips also grows new cells
quickly for growth and to replenish damaged
cells as it grows.
– There are two types of roots. Taproots and
Fibrous roots. Carrots (a dicot) are an example
of a tap root. Grasses and many weeds have
fibrous roots
From The Ground Up

5. • Transport System
Tracheophytes can grow to large
sizes because of their vascular tissue
(their transport system).
Tracheophytes have two main types
of vascular tissue:
Xylem and Phloem!
Xylem moves water and nutrients
from the ground upward in the plant.
Phloem carries food made in the
plant’s leaves down to other parts of
the plant.

6. • Stems
Stems transport materials between a plant’s roots and its leaves
and flowers. They also provide support. In some plants, stems
store food and water. Xylem and Phloem are within the stem.

7. Pause, Think, Digest
• What is the most widespread type of plant?
Angiosperms
• What is the difference between a Bryophyte
and a Tracheophyte?
Non-vascular vs Vascular
• What is Xylem and Phloem?
Vascular Tissues, Xylem moves water upward
into the plant while phloem carries food to
other plant parts

8. • The Leaf
– Leaves are the main organs that carry out photosynthesis in
a plant.
– Leaf size, shape, and structure are vital to plant survival.
– What organelles are responsible for photosynthesis?
– Chloroplasts
– Leaves have tiny openings called Stomata in which CO2 and
O2 are exchanged.
– Guard cells around the stomata
control the size of the opening.

9. • Monocots and
Dicots
Plant scientists can look at
a leaf and tell you what
kind of plant it is. Most
monocots have parallel
major veins that run the
length of the blade (like
grass), while dicot
leaves have a multi-
branched network of
major veins.
Now you can tell the
difference too! ???

10. • Gymnosperms and Angiosperms
An Angiosperm is a flowering plant that
reproduces by producing seeds from
Fruits. Like this beautiful Magnolia:
Gymnosperms are plants that produce
seeds but their seeds are within Cones or
cone-like structures like a Pine cone from
A Pine tree:

11. • Flower Structure and Reproduction

12. • Flower Structure and Reproduction II
Plants can reproduce sexually
or asexually.
If reproducing sexually,
pollen must come from the
anthers in the stamen (the
male portion carrying the
sperm) and captured by the
stigma (The female portion).
Pollen is transferred by wind
or pollinators such as birds,
insects, or even humans.

13. • Seeds, Cones, and Spores
Seeds are produced from fruits. Inside
the seed is the plant embryo; from which,
a new plant arises. Food is also stored in
the endosperm. This provides the embryo
with the energy it needs to grow.
Pines trees, a type of conifer, uses cones
to reproduce, but instead of being
enclosed in a fruit, the fertilized eggs are
open to the elements and either fall to the
ground or drift away in the wind.
Spores come from many non-vascular
plants such as mosses. One spore can
produce an entirely new organism.

14. Today’s Meet Discussion
• What are the organelles in leaves which assist with
gas exchange and water movement into and out of
the leaf?
Stomata and Guard Cells
• What is the difference between a monocot and a
dicot?
Monocot parallel veins, Dicots branch
• What parts of the Plant deal with reproduction?
Stamen (anther-contains the pollen), Pistil
(stigma-leads to ovary)

15. Video on Plant Reproduction
(if time allots)
https://www.youtube.com/watch?v=HLYPm2idSTE