Q121. Which is not a characteristic of imbibition?
(1) It is a reversible phenomenon
(2) Heat is generated
(3) Involves both capillarity and adsorption
(4) It is a property of hydrophobic and lyophobic colloids
Ans.4
---------------------------------------
Q122. Phenomenon not associated with root pressure is
(1) Sap exudation
(2) Bleeding
(3) Guttation
(4) Transpiration
Ans.4
---------------------------------------
Q123. Which is not true for root pressure
(1) Positive hydrostatic pressure
(2) Maximum during the day and minimum during night
(3) Magnitude is 1-2 bars
(4) Develops due to metabolic activity of
roots
Ans.2
---------------------------------------
Q124. Phenomenon of guttation
(1) is regulated by Cohesion-Tension
(2) is due to active solute accumulation by phloem
(3) Takes place to release excessive solutes
(4) More than one option is correct
Ans.3
--------------------------------------
Q125. Which of the following statement for hydathodes is correct?
(1) Opens to release excessive pure water from
(2) Contains a loosely arranged parenchyma called epithem
(3) These are found at the tips of the veins in leaves
(4) More than one option is correct
Ans.4
-------------------------------------
Q126. A- Most researchers agree that water is mainly 'pulled upward through the plant, where transpiration is the driving force.
B- Less than one percent of water reaching the leaves is used in plant growth and photosynthesis
C- Cobalt chloride paper turns blue on absorbing water
(1) All are correct
(2) Only C is incorrect
(3) Only B is incorrect
(4) Only A is correct
Ans.2
-------------------------------------
Q127. In a stomatal apparatus, cellulosic microfibrils are oriented
(1) Longitudinally on subsidiary cells
(2) Radially in the cell walls of guard cells
(3) Radially and longitudinally in wall of guard cells
(4) Longitudinally on both guard cells
Ans.2
-------------------------------------
Q128. According to potassium pump theory of Levitt
(1) Starch is incompletely oxidized to PEP during night
(2) Malic acid dissociates into malate ion and protons in the subsidiary cells
(3) Movement of H+ ions from guard cell to subsidiary cell is active
(4) Potassium malate decrease the OP of guard cells during day
Ans.3
------------------------------------
Q129. A - in dry atmosphere, the relative humidity is low, so the rate of transpiration increases
B - Slow breeze promotes the rate of transpiration
C - ABA promotes transpiration
D - High salt concentration in soil water increases transpiration
(1) C and D are correct
(2) B and C are correct
(3) A and C are correct
(4) A and B are correct
Ans.4
-------------------------------------
Q130. The conditions under which transpiration would be most rapid are
(1) Excess of water in soil only
(2) Low humidity, high temperature, turgid guard cells and moist soil
(3) Low velocity of wind only
(4) High humidity
Ans.2
-------------------------------------
Q131. During stomatal opening (photoactive) which does not occur?
(1) Increase in pH of guard cells
(2) Hydrolysis of starch in guard cells
(3) Increased TP of subsidiary cells
(4) Dissociation of malic acid in guard cell
Ans.3
-------------------------------------
Q132. Incorrect statement in relation to stomatal apparatus is
(1) Cellulose microfibrils are arranged longitudinally to axis of stomata
(2) Subsidiary cells are located as modified epidermal cells
(3) Guard cells may be ellipsoidal in monocots
(4) Inner walls of guard cells are thick and elastic
Ans.1
--------------------------------------
Q133. Select Incorrect statement w.r.t. translocation of mineral ions.
(1) The chief sinks for the mineral elements are the apical and lateral meristems.
(2) Most readily mobilised elements are N, P. K.
(3) Most of the nitrogen travels as inorganic ions through xylem.
(4) Small amount of P and S are carried as organic compounds through xylem.
Ans.3
--------------------------------------
Q134. A - Transport of water and minerals in Xylem, is --- A ---
B - Transport of organic and mineral nutrients is --- B---
(1) A- Unidirectional, B- Unidirectional
(2) A-Multidirectional, B-Multidirectional
(3) A-Multidirectional, B- Unidirectional
(4) A-Unidirectional, B- Multidirectional
Ans.4
-------------------------------------
Q135. According to the pressure flow hypothesis
A. Phloem loading produces a hypertonic condition in the sieve tubes.
B. Water potential gradient facilitates the mass movement in the phloem.
C. Phloem unloading is a passive process.
(1) A & B are incorrect
(2) B & C are incorrect
(3) A & B are correct
(4) A & C are correct
Ans.3
--------------------------------------
No comments:
Post a Comment