What is the direction of movement of sugars in phloem?

1.  Bi-directional

2.  Non-multidirectional

3.  Upward

4.  Downward

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

Which one of the following is correctly matched?

1. Passive transport of nutrients-ATP

2. Apoplast- Plasmodesmata

3. Potassium- Readily mobilized

4. Bakane of rice seedlings-F Skoog

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

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

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

Which of the following facilitates opening of stomatal aperture?

1. Decrease in turgidity of guard cells

2. Radial orientation of cellulose microfibrils in the cell wall of guard cells

3. Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells

4. Contraction of outer wall of guard cells

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