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15 Cards in this Set

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When did the origin of land plants from aquatic ancestors occur?
The Paleozoic era about 430 million years ago.
Most botanists agree that what, similar to certain multicellular green algae were probably forerunners for today's plant life?
Photosynthetic protists.
What were the first adaptations for plants?
A cuticle and a protective covering for the gametes and embryos of the plant.
How many distinct groups of early plants emerged during the Paleozoic Era?
Two.
What type of plants have vascular tissue?
Vascular plants.
In vascular plants, what transported water and nutrients throughout the plant?
Cells joined into tubes.
Vascular plants were the ancestors of all plants but what?
Mosses and their relatives.
Vascular tissue did not evolve in what?
The second group of plants from the Paleozoic Era.
The nonvascular plants from the Paleozoic Era were the ancestors of what?
Mosses and their relatives.
The soil provides water and minerals but what is missing?
There is no light underground for photosynthesis.
What is the body of a vascular plant differentiated into?
A root system and an aerial system of stems and leaves.
Roots that absorb water accross their surface generally lacks what?
A waxy cuticle that limits water evaporation in stems and leaves.
What increases the surface area of the roots in contact with water?
Root hairs.
All vascular plants have lignin, what is it.
A hard material embedded in the cellulose matrix of the cell walls.
What does lignin provide?
The needed support for trees and other large vascular plants.