1) Bulk flow can be achieved through ahydrostatic pressure gradient . Negative hydrostatic pressure gradient and positive hydrostatic pressure gradient is seen in
A) Suction through a straw and a garden hose respectively
B) A garden hose and suction through a straw respectively
C) Cobalt chloride paper and polyethene respectively
D) Blotting paper and cobalt chloride paper respectively
2) Apoplast is the system of adjacent cell walls that is continuous throug hout the plant except at the
A) Plasmodesmata
B) Vessel elements
C) Casparian strips of endodermis
D) Tracheids
3) Path of water movement from soil to xylem is
A) Metaxylem-> Protoxylem->Cortex-> Soil -> Root hair
B) Cortex-> Root hair-> Endodermis-> Pericyle Protoxylem --> Metaxylem
C) Soil -> Root hair -->Cortex-->Endodermis Pericycle -->Protox ylem --- > Metaxylem
D) Pericycle --> Soil --> Root hair >---> Cortex --> Endodermis -- >Protoxylem -- >Metaxylem
4) Select the correct ones a – Apoplastic movement of water occurs exclusively through cell wall. B— Solutes increase free energy of water or water potential , C-Symplastic movement occurs through plasmodesmata d- Membrane permeability depends upon membrane composition as well as chemical
nature of solute
A) a & b only
B) b & d only
C) a, c & d only
D) a , b & d only
5) Stomatal opening is under the control of
A) Epidermal cells
B) Palisade cells
C ) Spongy parenchyma cells
D) Guard cells
6) Unloading of mineral ions occurs at the fine vein endings through
A) Diffusion
B) Active uptake
C) Both A & B
D) Imbibition
7) The loading and unloading of food ( Phloem sap) to and from the sieve tube cells is
A) Active and passive respectively
B) Passive and passive respectively
C) Passive and active respectively
D) Active and active respectively
8) Read the following statements and find out the incorrect statement
A) Glucose is prepared at the source by photosynthesis which is converted to sucrose.
B) Loading at the source produces a hypotonic condition in phloem
C) Loading of the phloem sets up a water potential gradient that facilitates the mass movement in the water
D) Phloem tissue is composed of sieve tube cells, which form long columns with holes in their end walls called sieve plates
9) On a day, when there is plenty of atmospheric moisture, a small softstemmed plant cut horizontally near the base with a sharp blade early in the morning .Some drops of solution
ooze out of the cut stem, this comes out due to the
A) Transpiration pull
B) Positive root pressure
C) Negative root pressure
D) Negative hydrostatic pressure gradient
10) Read the following statements and find out the incorrect statement
A) Transpiration pull does not account for the majority of water transport , most plants meet their need by root pressure
B) Water loss in liquid phase is called guttation while in vapour phase is called transpiration
C) Besides the loss of water vapour in transpiration, exchange of oxygen and carbon dioxide in the leaf also occurs through stomata
D) When guard cells becomes flaccid, stomata closes and if turgid , stomata opens
11) (A) : Facilitated diffusion and active transport show characteristics of being highly selective , they are liable to saturate respond to inhibitor and are under hormonal regulation .
(R ) : Membrane proteins are responsible for both facilitated diffusion and active transport
a) If both A & R are true and R is the correct explanation of the A
b) If both A & R are true but R is not the correct explanation of the A
c) If A is true , but R is false
d) If both A & R are false
12) (A) : All solutions have a lower water potential than pure water
(R ) : If some solute is dissolved in pure water, the solution has fewer free water and the concentration of water decreases, reducing its water potential
a) If both A & R are true and R is the correct explanation of the A
b) If both A & R are true and R is not the correct explanation of the A
c) If A is true , but the R is false
d) If both A & R are false
13) (A) : Imbibition is a type of diffusion
(R) : In imbibitions water movement isagainst concentration gradient
a) If both A & R are true and R
is the correct explanation of the A
b) If both A & R are true but R is not the correct explanation of the A
c) If A is true , but the R is false
d) If both A & R are false
14) ( A ) : The diffusion rate depends on the size of substance. Smaller molecules diffuse faster
( R) : Substances soluble in lipids diffuse through the membrane slower
a) If both A & R are true and R is the correct explanation of the A
b) If both A & R are true but R is not the correct explanation of the A
c) If A is true , but the R is false
d) If both A & R are false
15) ( A) : Transport proteins of endodermal cells are control points
( R ) : At control points a plant adjusts the quantity and types of solutes that reach the xylem
a) If both A & R are true and R is the correct explanation of the A
b) If both A & R are true but R is not the correct explanation of the A
c) If A is true , but the R is false
d) If both A & R are false
