This preview shows page 1. Sign up to view the full content.
Unformatted text preview: Plant cells have vacuoles to accumulate water, and cell walls to help maintain turgor. (This works better at preventing excess water than it does at preventing dehydration.) Many cells and tissues need not be maintained because theyre dead (saves energy as well as water needed for metabolic functions) Xeromorphic plants frequently have anatomical adaptations to minimize transpiration loss as well as physiological adaptations such as the CAM metabolism discussed with photosynthesis Most transpiration loss is through stomata. Guard cells open and close so that water loss by transpiration is minimized when plants cant use CO 2 for photosynthesis. (The mechanism for stomatal operation will be discussed in a bit.) Even so, taking in sufficient water for metabolic needs and to counter transpiration loss is a challenge that plants must meet and physicists can explain....
View Full Document
This note was uploaded on 01/08/2012 for the course BIO 213 taught by Professor Makina during the Fall '09 term at SUNY Stony Brook.
- Fall '09