Plants Without Seeds: From Water To Land

Plants Without Seeds:
From Water To Land
By: Michael Sanabria,
Andrew Ashworth
How did seedless plants occur?
• This occurred after many generations of mutations that
produced things such as the cuticle, which helps hold in water
so the plant doesn’t dry out, and ways to reproduce without
having to rely on water.
How did organisms move from water
to land?
Plants slowly evolved over time to live on
land. The first land plants lived near the
edges of the water, because they lacked
systems of keeping water within the plants.
It is thought that hornworts are some of the
closest living relatives of the first land plants.
Non-Vascular Plants
Non vascular plants are plants that lack a
vascular system.
None of that stuff.
Vascular Plants
• Plants that have a
vascular system.
Rhizoids are small “roots”
that grow from a sideways
growing stem that is
underground. It is thought
that this was what normal
roots evolved from, along
with branches that grew
into the ground.
● Seedless Vascular plants
have been evolving for over
500,000,000 million years.
What are some characteristics of
seedless plants?
• All seedless plants reproduce through spores during the
sporophyte phase of the alternation of generations.
They have to live in moist places, like near ponds, because the
gametophyte phase relies on water for the sperm to travel to
the egg.
What is the life cycle of a seedless
Question 1
What is the cuticle?
I. Protects a young plant
II. A waxy covering that retards water loss
III. The skin around the plants nail
IV. Makes the plant look cute
Question 2
Which species are thought to be similar to the
earliest land plants?
I. Cheetah
II. Mouse
III. Hornworts
IV. Ferns
Question 3
About how long have vascular plants been
I. 500,000,000
II. 5,000,000
III. 65,500,000
IV. 4,700,000,000
Question 4
Roots are believed to evolve from what?
I. Branches
II. Leaves
III. Stylus
IV. Tabulae
Question 5
The earliest vascular plants lacked roots and
I. True
II. False
III. Impossible!