Section 22-2 Flashcards
Mosses and their relatives are generally called
Bryophytes
Bryophyte life cycles are highly dependent on
Water
How does the lack of vascular tissue keep bruophytes small
They can draw up water by osmosis only a few centimeters above the ground
Why must bryophytes live in places where there is standing water for ag least part of the year
During at least one stage of their life cycle, bryophytes produce permits that must swim through water to reach the eggs of other individuals
What are the three groups of plants that bryophytes include
Mosses
Liverworts
Hornworts
Where would you expect to find mosses growing
Areas with water, swamps and bogs near streams and in rain forests
Why are mosses the most abundant plants in polar regions
Because bryophytes are well adapted to life in wet habitats and nutrient poor soils. They also tolerate low temperatures
Why is the thin upright shoot of a moss plant not considered to be a true stem
Because they do not contain vascular tissue
Study photo
What do gametophytes of liverworts look like
Tiny green umbrellas
What are gemmae
Small multicellular reproductive structures
How do liverworts reproduce asexually
By means of gemmae. When washed out of a gemmae cup that gemmae can divide by mitosis and produce a new individual
What does a hornwort sporophyte look like
Tint green horns
In what sort of soil would liver worts and hornworts be expected to be found
Hornworts are found in soul that is damp year round. Liver worts are found in moist soil
In bryophytes which stage of the life cycle is dominate and carries out the most of the plants photosynthesis
Gametophyte
What fact of reproduction limits the distribution of bryophytes to habitats near water
For fertilization, the supermarket of a bryophyte must swim to a egg. Because of this dependence for water reproduction bryophytes must live in habitats where water is available at least part of a year
When a moss spore germinates what does it grow into
Into a mass of tangled green filaments called a protonema
Antheridia
Male reproductive structure
Sperm
Archegonia
Female reproductive structure
eggs cells
What does the zygote depend on for water and nutrients
The zygote grows out of the body of a gametophyte and depends on it for water and nutrients
In certain envoirments the dead remains of sphagnum accumulate to form thick deposits of
Peat
Why do gardens add peat to soil
Because it improves the soils ability to retain water and can increase soil acidity
