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Unformatted text preview: B fixation of soil atmospheric CO2 C storage of energy (food) D absorption of soil water E acquisition of mineral nutrients FILL IN THE BLANK: Vascular phloem is composed of companion cells and ____________ . 4 A guard cells B cortex elements C cambiates D tracheids E sieve tubes Which cell layer contains the Casparian strip? 5 A epidermis B endodermis C cortex D pericycle E vascular bundle 2/1/2010 8:21:42 AM...
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- Spring '11