1. Which of the following statements about the distribution of sap throughout a plant is true?
A) The mechanism that explains the movement of sugars throughout a plant is called the pressure-flow hypothesis.
B) The driving force for sugar movement is transpiration.
C) The main component of phloem sap is glucose.
D) Companion cells form the conducting tissue for sap.
2. Which of the following statements about nutrient uptake by plants is true?
A)Root hairs increase the volume of roots for more efficient absorption of water and nutrients.
B) Plants require other elements besides carbon, hydrogen, and oxygen to grow, and they can obtain these in soil.
C) Positively charged ions remain dissolved in water and are easily absorbed by plant roots.
D)Plants can easily absorb mineral ions from soil with large amounts of organic matter.