27. Which of the following statements about Consumptive Water Use is untrue? a. Less than 1% of CU is retained by plants b. CU represents the quantity of water retained by plants plus that lost through evapotranspiration c. CU is indicative of the transpiration rate of plants d. CU is usually less than evaporation from ponded water 28. A Transpiration Ratio of 200 can be interpreted to mean a. That al.0 hectare plot produces 10 tonnes of crop biomass using 2000 tonnes of water b. That a 0.1 ha plot of land produces 10 tonnes of economic crop yield using 2000 tonnes of water c. That a 0.1 ha plot of land produces 10 tonnes of crop biomass using 2000 tonnes of water d. That a1 0 hectare plot produces 10 tonnes of economic crop yield using 2000 tonnes of water 29. Which of the following statements regarding passive absorption of water by plants is true? a. Passive absorption accounts for less than 1% of water taken by plants b. Plant roots respire during the process of passive absorption c. Passive absorption is not possible in saline soil conditions d. Passive absorption accounts for as much as 50% of plant water uptake.