Bio Exam III Extra
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Explain gametophyte of Marchantia
- chloroplast-bearing cells in the upper layers
- several layers of colorless cells below
- rhizoids that anchor the plant body to the substrate
What do the pores of Marchantia permit?
they permit exchange of gases int he air-filled chambers that honeycomb the upper photosynthetic layer
Explain the arrangement of the specialized cells in Marchantia
arranged in four or five superimposed circular tiers of four cells each and hte whole structure is barrel shaped
Under dry conditions, what do the cells of Marchantia do? Under moist conditions?
under dry conditions, the cells of the bottommost tier, which usually protrude into the chamber, become juxtaposed and retard water loss, whereas under moist conditions they separate
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