The water potential of pure water is:

1. Less than zero

2. More than zero but less than one

3. More than one

4. Zero

Root pressure develops due to?
1. Active absorption
2. Low osmotic potential in Soil
3. Passive absorption
4. Increase in transpiration

A column of water within xylem vessels of tall trees does not break under its weight because of?
1. Dissolved sugar in water
2. Tensile strength of water
3. Lignification of xylem vessels
4. Positive root pressure

Transpiration and root pressure cause water to rise in plants by:

Which one of the following is correctly matched?

1. Passive transport of nutrients-ATP

2. Apoplast- Plasmodesmata

3. Potassium- Readily mobilized

4. Bakanae of rice seedlings-F Skoog

Xylem translocates:

1. Water, minerals salts, some nitrogen and hormones

2. Water only

3. Water and mineral salts only

4. Water, mineral and some organic nitrogen only

What is the direction of movement of sugars in phloem?

1. Bi-directional

2. Non-multidirectional

3. Upward

4. Downward

Which of the following facilitates opening of stomatal aperture?

A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?

1.  Acidic

2.  Alkaline

3.  Low refractive index

4.  The absence of sugar