Which of the following statements about transport in plants is(are) correct?

Question

A. Roots are capped with a structure that prevents water from leaking out.

B. As minerals enter the roots, they increase the mineral concentration inside the plant. This allows water to enter using osmosis, a process that requires no energy.

C. Water transport along the length of a plant occurs because water molecules stick to each other and to the walls of xylem, causing the water level to rise.

D. Minerals enter the roots using active transport, a process that requires energy.

Answer 1

B and D are correct. Here is why........Water and mineral enter through root epidermis, cross the cortex, pass into the stele, and are carried upward in the xylem.
Active accumulation of Mineral Ions. The cells cannot get enough mineral ions from the soil by diffusion alone. The soils solution is too dilute.
ACTIVE TRANSPORT of these ions must occur. Specific carrier proteins in the plasma membrane attract and carry their specific mineral into the cell. A Proton Pump: H+ is pumped out of the cell causing a change in pH and a voltage across the membrane. This helps drive the anions and cations into the cell. Water and minerals cross the cortex in one of 2 ways: Via SYMPLAST which is the living continuum of cytoplasm connected by PLASMODESMATA. Via APOPLAST which is nonliving matrix of cell walls. At the endodermis the apoplastic route is blocked by the CASPARIAN STRIP. this is a ring of suberin around each endodermal cell. Here water and minerals MUST enter the stele through the cells of the endodermis. Water and minerals enter the stele via symplast, but xylem is part of the apoplast. Transfer cells selectively pump ions out of the symplast into the apoplast so they may enter the xylem. This action requires energy.

Answer 2

A. False. They aren't capped. The water doesn't leak out because of transpiration.
B. True. Osmosis requires no energy and minerals entering the root does increase the concentration.
C. False. Water transportion is because of transpiration pulling the water through the plant for photosynthesis.
D. True. Mineral salts use active transport, which requires energy because it is against the concentration gradient.

I hope this helped:D

Answer 3

c