Transcript The Characteristics of Seed Plants

The Characteristics of
Seed Plants
Chapter 10 Section 3
Why do scientists believe in these
supposed relationships?

 We
do see varietal variation, but no
transition from one major kind of
plant into another.
Seed Plants
 Seed
plants share two important
characteristics.
 They have vascular tissue, & they
use pollen & seeds to reproduce.
 They all have body plans that include
leaves, stems, and roots.
Water, food and minerals are transported
throughout plants in vascular tissue.
Two types of Vascular Tissues
Xylem & Phloem
Phloem is the vascular tissue through
which food moves.
 When food is made in the plant’s leaves, it
enters the phloem & travels to other
parts of the plant.
 Water & minerals travel in the vascular
tissue called xylem.
 The plant’s roots absorb water & minerals
from the soil.
 These materials enter the root’s xylem &
move upward into the stems & leaves.




Seed plants can live in
a variety of
environments.
They produce pollen,
tiny structures that
contain the cells that
later become sperm
cells.
Pollen delivers sperm
cells directly near the
eggs, therefore seed
plants do not need
water for fertilization
to occur.
Pollen
Bee covered in pollen.
Seeds are structures
that contain a young
plant inside a
protective covering.
 Inside a seed is a
partially developed
plant.
 If a seed lands in an
area where
conditions are
favorable, it sprouts
out of the seed &
begins to grow.
 A seed has three main
parts- an embryo,
stored food, & a seed

Seeds
Seed Plants
The young plant that develops from the
zygote, or fertilized egg, is called the
embryo & has the beginnings of roots,
stems, & leaves.
 The embryo also has one or two seed
leaves, or cotyledons.
 In some seeds, the cotyledons store food.
 The outer covering of a seed is called a
seed coat.
 A seed may remain inactive for awhile.

Germination


Germination occurs
when the embryo
begins to grow again
& pushes out of the
seed.
Environmental
conditions, such as
temperature &
moisture, must be just
right in order for a
seed to germinate.