Biology : Transport in Plants

Diffusion Pressure Deficit (DPD) is equal to the Osmotic pressure substracted by

• Osmotic Pressure (OP)

• Turgor Pressure (TP)

• Suction Pressure (SP)

• Water Potential (${\mathrm{\psi }}_{\mathrm{w}}$)

The right equation for water potential is

• $\mathrm{\psi } = {\mathrm{\psi }}_{\mathrm{p}} - ( {\mathrm{\psi }}_{\mathrm{s}} + {\mathrm{\psi }}_{\mathrm{m}} )$

• $\mathrm{\psi } = {\mathrm{\psi }}_{\mathrm{p} }+ ( {\mathrm{\psi }}_{\mathrm{s}} - {\mathrm{\psi }}_{\mathrm{m}} )$

• ${\mathrm{\psi }}_{\mathrm{w}} = {\mathrm{\psi }}_{\mathrm{s}} + {\mathrm{\psi }}_{\mathrm{p}}$

• ${\mathrm{\psi }}_{\mathrm{w}} = {\mathrm{\psi }}_{\mathrm{p}} + {\mathrm{\psi }}_{\mathrm{\pi }} + {\mathrm{\psi }}_{\mathrm{m}}$

Sunken stomata are present in

• mesophyte

• xerophyte

• epiphytes

• All of these

In plants, water supply is due to

• osmosis

• imbibition

• guttation

• adhesion force

Most accepted theory for ascent of sap is

• capillarity theory

• root pressure theory

• pulsation theory

• transpiration pull theory

Transpiration differ from evaporation in

• rate of water loss

• transpiration is a physiological process whereas evaporation is physical process

• transpiration is a physical process while evaporation is physiological process

• frequency of water loss

An antitranspirant is

• cobalt chloride

• mercury

• potassium

• phenyl mercuric acetate

Good soil is :

• which holds whole of the water that enters into it

• which allows percolating the water slowly from it

• which allows water to pass very quickly from it

• which allows limited amount of water to retain into it

If turgor pressure becomes equal to the wall pressure, then

• water leaves the cell

• water enters the cell

• no exchange of water takes place

• solute goes from the cell into water

Wooden doors swell up and get stuck during the rainy season. This is due to the phenomenon of

• imbibition

• endosmosis

• capillarity

• deplasmolysis