Transport in Plants

Movement and accumulation of ions across a membrane against their concentration gradient can be explained by

1. Facilitated Diffusion
2. Passive Transport
3. Active Transport
4. Osmosis

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

1. Both Statement I and Statement II are incorrect
2. Statement I is correct but Statement II is incorrect
3. Statement I is incorrect but Statement II is correct
4. Both Statement I and Statement II are correct

Match List I with List II :

1. A-IV, B-III, C-II, D-I
2. A-III, B-I, C-IV, D-II
3. A-II, B-I, C-IV, D-III
4. A-II, B-IV, C-I, D-III

"Girdling Experiment" was performed by Plant Physiologists to identify the plant tissue through which:

1. water is transported
2. food is transported
3. for both water and food transportation
4. osmosis is observed

Which of the following is not observed during apoplastic pathway?

1. Movement of water occurs through intercellular spaces and wall of the cells
2. The movement does not involve crossing of cell membrane
3. The movement is aided by cytoplasmic streaming
4. Apoplast is continuous and does not provide any barrier to water movement

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

Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of following options.

1. The above processes happen only during night time.
2. One process occurs during day time and the other at night.
3. Both processes cannot happen simultaneously.
4. Both processes can happen together because the diffusion coefficient of water and CO2 is different.

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. Absence of sugar

Root pressure develops due to

1. passive absorption
2. active absorption
3. increase in transpiration
4. low osmotic potential in soil.

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

1. lignification of xylem vessels
2. positive root pressure
3. dissolved sugars in water
4. tensile strength of water.

In a ring girdled plant

1. the shoot and root die together
2. neither root nor shoot will die
3. the shoot dies first
4. the root dies first.

Transpiration and root pressure cause water to rise in plants by

1. pushing it upward
2. pushing and pulling it, respectively
3. pulling it upward
4. pulling and pushing it, respectively.

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

1. Starch hydrolysis
2. Guard cell photosynthesis
3. Transpiration
4. Potassium influx and efflux

Which of the following criteria does not pertain to facilitated transport?

1. Transport saturation
2. Uphill transport
3. Requirement of special membrane proteins
4. High selectivity

Function of companion cells is :

1. Providing water to phloem
2. Loading of sucrose into sieve elements
3. Loading of sucrose into sieve elements by passive transport
4. Providing energy to sieve elements for active transport

Guttation is the result of

1. diffusion
2. transpiration
3. osmosis
4. root pressure

Guard cells help in

1. transpiration
2. guttation
3. fighting against infection
4. protection against grazing

The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of

1. weak gravitational pull
2. transpiration pull
3. lignified thick walls
4. cohesion and adhesion

Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure 7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be

1. no movement of water
2. equilibrium between the two
3. movement of water from cell A to B
4. movement of water from cell B to A

The translocation of organic solutes in sieve tube members is supported by

1. cytoplasmic streaming
2. root pressure and transpiration pull
3. P-proteins
4. mass flow involving a carrier and ATP.

Potometer works on the principle of

1. osmotic pressure
2. amount of water absorbed equals the amount transpired
3. root pressure
4. potential difference between the tip of the tube and that of the plant.