True. The maturation region of root tip possess millions of root hairs. Root hairs increase the surface area for absorption. Water is absorbed along with mineral salts by the root hairs through diffusion.

I, II, III & IV are the correct set of statements related to the movement of substances through vascular tissues.

Xylem transports mainly water, mineral salts, and inorganic solutes from the roots to aerial parts of the plant. Although it was traditionally believed that xylem transported only water and minerals, xylem sap analysis shows the presence of some organic solutes also. Especially elements such as nitrogen, some amount of sulphur and phosphorous are carried as amino acids and related compounds. Similarly phloem too transports inorganic solutes, though they primarily transport sugars and other organic solutes, however here the transport is bi-directional from leaves and storage organs to other parts.

False. Transport of substance against the concentration gradient is impossible without the expenditure of energy. The transport can be done without the usage of energy as long as it is along the concentration gradient.

Pressure potential in any cell is created by the water present in the cytoplasm. When the water inside the cell comes out, the pressure on the cell wall becomes zero.

Active transport uses energy to pump molecules against concentration gradient i.e from the region of lower concentration to higher concentration and hence the transport is referred as uphill transport.