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bot exam 3
Terms in this set (10)
What features suggest that plants most likely evolved from a green alga?
They are considered to be an ancestral to plants because both they both reproduce chlorophyll a/b, both have cell walls made of cellulose.
How three groups of the Bryophytes, the Liverworts, Mosses, and Hornworts differ from each other?
Bryophytes are distinct from other land plants because they do not contain xylem. Except in the hornworts, the sporophyte is typically differentiated into a foot, a seta, and a capsule, or sporangium. Hornwort sporophytes lack a seta. Maturing moss and hornwort sporophytes are green and become less nutritionally dependent on their gametophytes than those of liverworts, which usually remain completely dependent on their gametophytes. Liverworts lack stomata, whereas stomata are present in mosses and hornworts.
How Bryophytes Are Ecologically Important?
Bryophytes are very important in initiating soil formation on barren terrain, in maintaining soil moisture, and in recycling nutrients in forest vegetation. The presence of bryophytes is useful in assessing the productivity and nutrient status of forest types.
What are general characteristics of vascular plants?
Vascular plants have a root system, a shoot system and a vascular system. They are characterized by the possession of the vascular tissues xylem and phloem.
Explain 3 basic ways the primary vascular tissues are arranged in steles
protostele, siphonostele, eustele
How the roots and leaves evolved in plants?
Roots evolved from the underground portions of the ancient plant body. Microphylls evolved either as superficial lateral outgrowths of the stem or from sterile sporangia. Megaphylls evolved from branch systems.
Explain how seedless vascular plants exhibit an Alternation of Heteromorphic Generations.
the diploid sporophyte alternates with the haploid gametophyte phase
Explain "The Oldest Fossils of Vascular Plants Belong to the Phylum Rhyniophyta"
The first vascular plant appeared approximately 430 million years ago. They have conducting cells similar to bryophyte hydroids.
Can an incomplete flower be a perfect flower?
Yes. If the stamen and carpel are present, the flower is perfect even if it is missing other parts such as the petals and sepals.
Describe the two fertilization events of "double fertilization."
One fertilizes the egg cell to form the zygote, while the other fuses with the two polar nuclei that form the endosperm.
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