Thursday, March 15, 2012


1 First discovered Phytohormone was

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

5 Auxin influenced apical dominance in Plants was shown by

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

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

14 20 Carbon Gibberellins are
I. GA20
II. GA27

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

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

26 Cytokinins are synthesized from

27 These substances structurally resemble each other
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

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

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

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

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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