Transport in Plants · Question 5

Addition of more solutes in a given solution will:

1. raise its water potential
2. lower its water potential
3. make its water potential zero
4. not affect the water potential at all

When a carrier protein facilitates the movement of two molecules across the membrane in same direction, it is called

1. Symport
2. Uniport
3. Transport
4. Antiport

The ascent of xylem sap in plants is mainly accomplished by the

1. root pressure
2. size of the stomatal aperture
3. distribution of stomata on the upper and lower epidermis
4. cohesion and adhesion between water molecules

Match List-I with List-II : Choose the correct answer from the options given below.

1. (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
2. (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
3. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
4. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is

1. Transpiration
2. Root pressure
3. Imbibition
4. Plasmolysis

What is the direction of movement of sugars in phloem?

1. Downward
2. Bi-directional
3. Non-multidirectional
4. Upward

Xylem translocates:

1. Water, mineral salts and some organic nitrogen only
2. Water, mineral salts, some organic nitrogen and hormones
3. Water only
4. Water and mineral salts only

Stomatal movement is not affected by

1. O2 concentration
2. temperature
3. CO2 concentration
4. light

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