17.8–17.11
17.8–Plant nutrition: plants obtain sunlight and usable chemical elements from the environment.
Just as humans will not grow and remain healthy without a nutritious diet, plants will get sick, wither, and even die if they don’t have adequate nutrition.
723
Q
When the concentration of a mineral is higher inside root cells than in the soil:
- a) ATP is used to import more of the mineral into the root cells.
- b) the mineral moves by diffusion from the soil into the root cells.
- c) energy is used to export the mineral into the soil.
- d) the absorption of water is blocked.
- e) the plant loses the mineral passively to the environment.
Evaporation from the leaves of a tree pulls water up from the roots as an unbroken column through the entire height of the tree. This feat is possible because of which characteristic(s) of water?
- a) high heat capacity
- b) cohesion and kinetic energy
- c) cohesion
- d) low heat capacity
- e) absorption
Sugar produced in the leaves is transported elsewhere in the plant through:
- a) the movement of symbiotic bacteria that carry the sugar.
- b) the stoma apparatus.
- c) sap vesicles.
- d) sieve tubes that make up the xylem.
- e) sieve tubes that make up the phloem.
