Tracheids differ from other treachery elements

• having Casparian strips

• being imperforate

• lacking nucleus

• lacking nucleus

Root pressure develops due to

• active absorption

• low osmotic potential in soil

• passive absorption

• passive absorption

A column of water within xylem vessels of tall trees does not break under its weight because of

• Dissolved sugars in water

• Tensile strength of water

• Lignification of xylem vessels

• Lignification of xylem vessels

A protoplast is a cell

• without plasma membrane

• without nucleus

• undergoing division

• undergoing division

Which one of the following is correctly matched?

• Passive transport of nutrients - ATP

• Apoplast - Plasmodesmata

• Potassium-Readily mobilization

• Potassium-Readily immobilization

Approximately seventy percent of carbon dioxide absorbed by the blood will be transported to the lungs

• as bicarbonate ion

• in the form of dissolved gas molecules

• by binding to RBC

• by binding to RBC

Transpiration and root pressure cause water to rise in plant by?

• pulling it upward

• pulling and pushing it, respectively

• pulling it upward

• pulling it upward

In a ring girdled plant

• the shoot dies first

• the root dies first

• the shoot and root die together

• the shoot and root die together

129.

Which one gives the most valid and recent explanation for stomatal movements?

• Transpiration

• Potassium influx and efflux

• Starch hydrolysis

• Starch hydrolysis

Which one gives the most valid and recent explanation for stomatal movements?

• Transpiration

• Potassium influx and efflux

• Starch hydrolysis

• Starch hydrolysis