Which of the following statements are wrong? (i) Mass flow of substances inside the plant is the result of pressure differences between the two points (ii) Diffusion cannot account for long distance movement of water and solutes in plants (iii) Movement through apoplast does not involve crossing the cell membrane (iv) The movement of water through endodermis is only through symplast
Options:
A . (i)
B . (ii)
C . (iii)
D . none
Answer: Option D : D Mass flow of substances inside the plant is due to either a positive or a negative pressure gradient. Transport of substances can occur because of diffusion only through short distances. In the apoplast pathway, water moves outside the cell membrane. Endodermis has an impermeable casparian strip around the cell walls. Only some cells do not have the casparian strip, and water flows through these using the symplast pathway. Hence, none of the given statements is wrong.
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