Botany Unit 2

Bryophytes

-nonvascular -no xylem & phloem -only plant with dominant gametophyte generation -sporophytes remain permanently attached and nutritionally dependent on the gametophytes

________ is a leaf that arose from a branch system

A megaphyll

Stomata

Allow gas exchange for photosynthesis

Plants probably descended from a group of green algae called

Charophytes

The waxy layer that covers the arias parts of plants is the

Cuticle

This statement is not true

Ferns are the most economically important group of borohyotes

These plants have hollow, jointed stems that are impregnanted with silica

Horsetails

These plants have vascularized stems but lack true roots and leaves

Horsetails

The borophytes

Include: whisk ferns, horsetails, club mosses, and small plants that lack a vascular system

The green, gametangia-bearing moss plant

Is a haploid gametophyte generation

A strengthening compound found in cell walls of vascular plants is

Lignin

In plant life cycles...

The first stage in the diploid sporophyte generation is the zygote

Not a characteristic of a plant

Unicellular gametangia