103 The Origin and Evolution of Plants Exercise A: The Origin of Plants plant wh

Question

103 The Origin and Evolution of Plants Exercise A: The Origin of Plants plant when exposed to the air. While the cuticle kept water in, it also did not allow CO, in, which is necessary for photosynthesis to occur. Specialized cells known as guard cells created openings, stomata, in the leaves to allow for the diffusion of gases. Spores are single-celled gametes that are able to disperse overland and have very thick-walls to protect the embryo from drying out. It is currently hypothesized that land plants developed from stoneworts. While both classes within Streptophyta are considered multicellular, land plants vary from stoneworts by having complex, specialized, and very protective reproductive structures (ie. spores in sporangia or seeds in fruits), whereas stoneworts have gametes within a simple structure, the oogonium, prone to drying out when exposed to air 6. Label the cuticle, guard cells, and a stoma. H,o 6a-6h-Label the following evolutionary events: 6.6m. Label the corresponding common names: Origin of multicellularity (2x) Origin of chloroplast Origin of cuticle Origin of guard cells Origin of spores Loss of phycobiliprotein Origin of chlorophyll b Red algae e Stoneworts . Green algae Land plants - - Glaucophyte algae Glaucophyta Archaeplastida Rhodophyta b. k. StreptophytaCharophyceae d. Embryophyceae m. e. h. http://thebiologyprimer.com/the-origin-and-evolution-of-plants

Explanation / Answer

A. origin of multicellularty

b. origin of spore

c. origin of chlorophyll b

d. orgin of cuticle

e.

f. origin od chloroplast

g. origin of guard cell

h. loss of phycobilliprotein

i.Glaucophyte algae

j. red algae

k. green algae

l. stone worts

m. land plant

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