Transport in Plants Biology Quiz for NEET

Water moves from high water potential to low water potential

In active transport, materials are transported across a membrane with the help of mobile carrier protein and ATP.

In passive transport, substances move along the concentration gradient, i.e., from its higher concentration to its lower concentration.

The direction of movement of sugar in phloem is bi-directional as it depends on source-sink relationship which is variable in plants.

Xylem is associated with tanslocation of mainly water, mineral salts, some organic nitrogen and hormones.

Fungus associated with roots of Pinus increases minerals & water absorption for the plant by increasing surface area and in turn fungus gets food from plant. Therefore, mycorrhizal association is obligatory for Pinus seed germination

Light, temperature and concentration of CO₂ affect opening and closing of stomata while they are not affected by O₂ concentration.

Cellulose microfibrils are oriented radially rather than longitudinally which makes easy for the stoma to open.

By convention, the water potential of pure water at standard temperature, which is not under any pressure, is taken to be zero.

Alkaline pH (7.8 – 8.0) is present in phloem sap where as xylem sap is acidic.

Diffusion of water vapour and CO₂ are independent process. Their diffusion depends on the difference in their partial pressure.

As various ions from the soil are actively transported into the vascular tissues of the roots, water follows and increases the pressure inside the xylem i.e., root pressure (positive pressure).

 Tensile strength is the ability to resist pulling forces.

Due to passive absorption of solute and solvent, there is accumulation of molecules which creates a positive hydrostatic pressure in roots.

Transpiration occurs due to opening of guard cell.

Cohesion between water molecules. Adhesion between water molecules and lignocellulosic walls of xylem.

Water moves from low DPD to high DPD.

Full form of DPD – diffusion pressure deficit

As it does not require energy.

Turgor pressure develops when volume of cytoplasm increases and cell wall exerts a pressure.

Because in fully turgid cell DPD will be 0.

Because increase in turgidity means increase in volume of cell which will put a pressure of walls of cell which is Turgor pressure.