cover leaves and essentially eliminates water loss and CO2 uptake * leaf anatomy (Figure 31.19) - location of xylem and phloem * stomata (stoma, singular) - microscopic openings/pores in epidermis of plant - gas exchange: CO2 uptake and O2 loss - most abundant on leaves but also found on young stems - in most species, stomata account for only about 1% of total leaf area - tremendous number of stomata/leaf: e.g. 12,000 stomata/cm of leaf surface in tobacco - over 90% of water lost by plant is through stomata;
(CO2; uptake; ) (over 90% of water; lost; by plant)
CO2 over 90% of water
uptake lost
by plant