Saturday, March 17, 2012

TRANSPIRATION AND ENZYMES ASSIGNMENT

1 Total amount of water transpired by a typical plant is




Ans:95% of absorbed water
2 In natural conditions, none of the living cells of the following plant shows transpiration




Ans:Hydrilla
3 Developed Pepo fruit shows




Ans:lenticular transpiration
4 Identify the plant that shows relatively more rates of cuticular transpiration




Ans:Tribulus
5 These aspects are integral parts of SPAC




Ans:All
6 In Cobalt chloride paper method upon absorbing moisture,




Ans:The Blue paper turns pink
7 Transpiration is a




Ans:Biophysical process
8 Match the following





Ans:A - IV, B - III, C - II, D - I
9 [A]: Leaves do not show Lenticular transpiration
[R]: Leaves do not form periderm





Ans:Both A and R are true and R is the correct explanation of A
10 Guard cells differ from other epidermal cells in
I. Size
II. Shape
III. Having chloroplast
IV. Unevenly thickened wall





Ans:All
11 During transpiration water is evaporated mainly at




Ans:Cell walls of mesophyll cells
12 Potamogeton is described as Astomatous because




Ans:it has functionless stomata
13 The following accounts for 1-2%.
I. Cuticular transpiration
II. Lenticular transpiration
III. Stomatal area per unit area of leaf
IV. Area of guard cell with respect to area of normal epidermal cell





Ans:II and III
14 Subsidiary cells differ with other epidermal cells in
I. Size
II. Shape
III. Position
IV. Protoplast contents





Ans:All except IV
15 [A]: Stoma is turgor operated valve
[R]: When subsidiary cell is turgid, stoma is opened and when accessory cell is flaccid the stoma is closed.





Ans:A is true but R is false
16 The opening and closing of stomata is controlled by
I. Size of guard cells
II. Shape of guard cells
III. Metabolic changes in the guard cells
IV. ABA levels in the guard cells





Ans:I, II,III, IV
17 [A]: All scotoactive plants are xerophytes.
[R]: Acacia is a scotoactive plant.





Ans:A is true but R is false
18 During opening and closing of stomata, these ions can not move between the guard cells and subsidiary cells in both active and passive methods




Ans:Malate
19 Stomatal closure is favoured by
I. High CO2 conc.
II. High ABA conc.
III. High malate in guard cells





Ans:I and II
20 K+ pump hypothesis for stomatal movement was proposed by




Ans:Levitt
21 During opening of stomata, the pH of the guard cells




Ans:Increases
22 Choose the correct statement




Ans:During stomatal closure, there is more efflux of Malate ions into subsidiary cells
23 The stomatal index of a plant is 0.025. Number of epidermal cells in a unit area is 1000. What must be the stomatal frequency of the plant.




Ans:25
24 Study the following with respect to transpiration and choose the correct match





Ans:A - III, B - IV, C - II, D - I
25 Study the following table and choose the correct combination





Ans:I and II
26 [A]: Transpiration is an active pcrocess
[R]: ATP are used during effulux of H+ from guard cells





Ans:A is false but R is true
27 Match the following





Ans:A - III, B - V, C - IV, D - I
28 Photo active stomata are seen in




Ans:Acacia
29 During stomatal closure, there is more entry of the following ions into subsidiary cells




Ans:H+
30 Influence of the following factors is inversely proportional to the rate of transpiration
I. light
II. Atmospheric humidity
III. Shoot – Root ratio
IV. Temperature





Ans:II and III
31 Transpiration does not help the plant in




Ans:Active absorption of minerals
32 [A]: Plastic emulsions are antitranspirants
[R]: They selectively show their influence on guard cells





Ans:A is true but R is false
33 [A] : Carbonic anhydrase is a metalloenzyme.
[R] : It has Zn as its apoenzyme.





Ans:A is true but R is false
34 Study the following and identify the correct match
Enzyme                Cofactor

A. Catalase I) Mg2+
B. Cytochrome  II) Mo oxidase
C. Hexokinase III) Mn2+
D. IAA oxidase IV) Cu2+
                  V) Fe2+  





Ans:A - V, B - IV, C - I, D -III
35 The cofactor of nitrate reductase is




Ans:Mo
36 Peroxidase has




Ans:Apoenzyme and prosthetic group
37 The enzyme that converts malic acid to oxaloacetate is a/an




Ans:Oxidoreductase
38 Study the following and identify the correct groups





Ans:i and iii
39 The coenzyme of malate dehydrogenase is derived from the vitamin




Ans:Niacin
40 Choose the enzyme that also shows hydrolysis activity but doesn’t belong to hydrolases




Ans:Glutamine synthetase
41 The enzyme glucose-6-phosphotransferase belongs to
i) Class 2
ii) Subclass 7
iii) Sub-subclass 1
iv) Subclass 2





Ans:only i and ii
42 [A] : Co-enzyme A is derived from vitamin A.
[R] : Co-enzymes are mostly derived from vitamins.





Ans:A is false but R is true
43 The energy for the activation of hexose glucose to form trioses is provided by




Ans:ATP
44 Amount of energy required for the formation of 5 molecules of oxygen from H2O2 in the presence of catalase is




Ans:180 K.cal
45 Lock and key model best explains the following property of enzymes




Ans:Specificity
46 [A] : Cyanides can inhibit enzymatic activity.
[R] : Cyanides compete with the substrate for active site of the enzyme.





Ans:A is true but R is false
47 Malonic acid shows structural similarity with




Ans:Succinic acid
48 The following is an allosteric enzyme




Ans:Enzyme that forms glucose-6-PO4
49 This is cofactor-less enzyme




Ans:Pepsin
50 Match the following
A. Lock and key model I) Koshland
B. The term Allosteric II) J.B.S. Haldane
C. Enzyme classification III) Emil Fisher
D. Treatise on enzymes IV) Monad
                          V) IUB





Ans:A - III, B - IV, C - V, D - II
51 Most of the enzymes show their maximum activity at pH




Ans:7
52 [A] : An enzyme is a protein.
[R] : Enzymes cannot utilize proteins as their substrates.





Ans:A is true but R is false
53 Lock and Key model was proposed by




Ans:E. Fisher
54 This is allosteric modulators




Ans:Glucose mono phosphagte
55 Amount of energy required for the activation of Hydrogen peroxide to form Water and Oxygen is




Ans:18000 cal

No comments:

Asthra