17.8–17.11: 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.

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Question 17.30

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.

Question 17.31

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

Question 17.32

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.