Thursday, March 15, 2012

PHYTOHORMONES-ASSIGNMENT

1 First discovered Phytohormone was




Ans:Auxin
2 The contributions of Went for Auxin research were
I. Isolation of Auxin
II. Established relationship between Auxin concentration and degree of curvature of Coleoptiles
III. Provided the best and first bioassay of auxins
IV. Done his experiments on developed plants of Avena sativa.





Ans:All except IV
3 [A]: Auxins are present in minute quantities in the plant organs.
[R]: 1mg of auxin is present in 1000 coleoptyles





Ans:A is true but R is false
4 The synthetic auxin among the following is




Ans:NAA
5 Auxin influenced apical dominance in Plants was shown by




Ans:Thimann
6 [A]: Auxins show more basipetalous movement than acropetalous movement
[R]: More auxin is synthesized in the shoot apex than root apex





Ans:Both A and R are true and R is the correct explanation of A
7 Auxins are transported at the rate of




Ans:1mm/ 6 min
8 The amino acid and Micronutrient required for auxin synthesis are




Ans:Tryptophan, Zn
9 [A]: Syntheitc auxins are more effective than natural auxins.
[R]: IBA is more effective in root induction in stem cuttings than NAA.





Ans:Both A and R are true but R is not the correct explanation of A
10 Auxins play a role in the differentiation of




Ans:Vessels
11 Match the following





Ans:A - IV, B - V, C - III, D -I
12 Auxins promote the formation of
I. Parthenocarpic fruits
II. Female flowers
III. Bisexual flowers
IV. Male flowers





Ans:I and II
13 One of the following plants show relatively more apical dominance




Ans:Eucalyptus
14 20 Carbon Gibberellins are
I. GA20
II. GA27
III. GA12
IV. GA3





Ans:II and III
15 The chemical formula for GA3 is




Ans:C19H22O5
16 [A]: Gibberellins are diterpenes
[R]: Gibberellins are synthesized from the product of 2nd decarboxylation reaction of aerobic respiration.





Ans:A is true but R is false
17 Gibberellins are not formed in




Ans:Senescent leaves
18 Arrange the following events of Gibberellin influenced seed germination in a sequence.
I. Formation of Sugars
II. a-amylase synthesis
III. Energy liberation
IV. Gibberellin synthesis





Ans:IV, II, I, III
19 Bolting is




Ans:sudden elongation of axis prior to flowering
20 Cytokinins are abundantly present in




Ans:Embryonic tissues
21 Richmond-Lang effect is




Ans:Cytokinin influenced delay of senescence
22 Match the following





Ans:A -II, B - III, C - V, D -I
23 [A]: Cytokinins promote stomatal opening
[R]: Zeatin increases K+ concentration in guard cells





Ans:Both A and R are true and R is the correct explanation of A
24 The following is the common positive physiological influence shown Auxins, Gibberellins and Cytokinins.




Ans:Cell expansion
25 The following is involved in the discovery of both Kinetin and Zeatin




Ans:Miller
26 Cytokinins are synthesized from




Ans:AMP
27 These substances structurally resemble each other
I. AB I
II. AB II
III. Dormin
IV. Kinetin





Ans:II and III
28 [A]: ABA is a growth inhibitor [R]: It inhibits the formation of seedlings from seeds




Ans:Both A and R are true and R is the correct explanation of A
29 Ethylene has no role as Fruit ripening hormone in




Ans:Casuaraina
30 Anti-cytokinin property of ABA is

I. Delay of senescence
II. Closing of stomata
III. Preventing parthenocarpy
IV. Inhibition of flowering





Ans:I and II
31 ABA has not been reported from




Ans: E.coli
32 Sprouting of Potato tubers can be prevented by the application of a hormone which is a




Ans:Sesquiterpene
33 Ethylene is synthesized from




Ans:Nitrogenous substance
34 Triple response growth influenced by Ethylene includes
I. Inhibition of stem elongation
II. Transverse growth of stem
III. Horizontal growth of plant
III. Promotion of Abscission





Ans:All except IV
35 Choose the correct statement




Ans:ABA is formed both catabolically and anabolically
36 [A]: Application of Fruit ripening hormone on crops has practical difficulties
[R]: The hormone is synthesized from a volatile substance





Ans:A is true but R is false
37 Choose the incorrect pair




Ans:Ethylene - Skoog
38 C40H56O2 is involved in the synthesis of




Ans:Senescence hormone
39 Match the following





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





Ans:All except III
41 Arrange the following Phytohormones with gradual increase in the number of Carbon atoms in each of their molecule
I. Hormone formed from methionine
II. Hormone formed from carotenoids
III. Hormone obtained from milky stage grains of Zea
IV. Hormone synthesized from connecting link of Glycolysis and Kreb’s cycle





Ans:I, III, II, IV
42 If the apical bud of a Zea plant having 7 nodes in its younger stem is removed, the following consequences can be noticed in the plant at later stages of development of the plant.
I. No increase in the length of stem
II. No increase in the number of nodes of the stem
III. Increase in the size of leaf
IV. No production of Auxins





Ans:II and III
43 Secretions of sexual stage of Fusarium moniliformae promotes




Ans:Seed germination
44 Natural Plant Growth Regulator is




Ans:PAA
45 Match the following





Ans:A - II, B - V, C - IV, D - I
46 Duration of darkness mainly determines flowering in




Ans:Glycine max
47 The influence of temperature is secondary for flowering in




Ans:Cucumis
48 The following plants whose flowering is regulated by relative dark and photoperiods can flower if the day length is shorter than its critical day length.
I. Chrysanthemum
II. Garnar and Allard’s experimental plant
III. Plant from which cytokinin was first extracted by Miller
IV. Spinach





Ans:I and II
49 Match the following





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





Ans:II and III

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ASTHRA JUNIOR COLLEGE , VIJAYAWADA