PHYTOHORMONES-ASSIGNMENT

1	First discovered Phytohormone was Gibberellin Auxin Cytokinin ABA 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. All except III All except I All except IV All 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 Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false A is false but R is true Ans:A is true but R is false
4	The synthetic auxin among the following is IAA PAA NAA 4-chloro IAA Ans:NAA
5	Auxin influenced apical dominance in Plants was shown by Cholodney Went Thimann Paal Ans:Thimann
6	[A]: Auxins show more basipetalous movement than acropetalous movement [R]: More auxin is synthesized in the shoot apex than root apex Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false A is false but R is true Ans:Both A and R are true and R is the correct explanation of A
7	Auxins are transported at the rate of 10 cm/hour 1mm/ 6 min 1 cm/ min 10 cm/ min. Ans:1mm/ 6 min
8	The amino acid and Micronutrient required for auxin synthesis are Phenyl Alanine, Mn Tryptophan, Mo Tryptophan, Zn Tyrosine, Mg 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. Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false A is false but R is true 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 Vessels Collenchyma Sieve tubes Companian cells Ans:Vessels
11	Match the following A - IV, B - V, C - II, D -I A - IV, B - V, C - III, D -II A - V, B - IV, C - III, D -I A - IV, B - V, C - III, D -I 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 I and II I and III I and IV II and III Ans:I and II
13	One of the following plants show relatively more apical dominance Eucalyptus Ficus Mangifera Gnetum Ans:Eucalyptus
14	20 Carbon Gibberellins are I. GA20 II. GA27 III. GA12 IV. GA3 I and II III and IV II and III I and IV Ans:II and III
15	The chemical formula for GA3 is C19H22O5 C20H22O5 C19H21O5 C19H22O6 Ans:C19H22O5
16	[A]: Gibberellins are diterpenes [R]: Gibberellins are synthesized from the product of 2nd decarboxylation reaction of aerobic respiration. Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false A is false but R is true Ans:A is true but R is false
17	Gibberellins are not formed in Buds Developing seeds Apical tissues Senescent leaves 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 II, IV, I, III IV, I, II, III IV, II, I, III I, II, IV, III Ans:IV, II, I, III
19	Bolting is sudden elongation of dwarf plant upon application of Gibberellins Formation of flowers on the Peduncle sudden elongation of axis prior to flowering Sudden emergence of seedling from the seed Ans:sudden elongation of axis prior to flowering
20	Cytokinins are abundantly present in Fruits Flowers Embryonic tissues Leaves Ans:Embryonic tissues
21	Richmond-Lang effect is Cytokinin influenced delay of senescence Gibberellin influenced sex determination Cytokinin influenced stomatal opening Gibberellin influenced parthenocarpy Ans:Cytokinin influenced delay of senescence
22	Match the following A -II, B - III, C - V, D -IV A -III, B - II, C - V, D -I A -II, B - III, C - I, D -IV A -II, B - III, C - V, D -I Ans:A -II, B - III, C - V, D -I
23	[A]: Cytokinins promote stomatal opening [R]: Zeatin increases K+ concentration in guard cells Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false A is false but R is true 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. Cell expansion Cell division Cell differentiation Morphogenesis Ans:Cell expansion
25	The following is involved in the discovery of both Kinetin and Zeatin Yabuta Skoog Miller Letham Ans:Miller
26	Cytokinins are synthesized from AMP GMP TMP CMP Ans:AMP
27	These substances structurally resemble each other I. AB I II. AB II III. Dormin IV. Kinetin I and II III and IV II and III I and III Ans:II and III
28	[A]: ABA is a growth inhibitor [R]: It inhibits the formation of seedlings from seeds Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false A is false but R is true 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 Pyrus malus Musa Ananas Casuaraina Ans:Casuaraina
30	Anti-cytokinin property of ABA is I. Delay of senescence II. Closing of stomata III. Preventing parthenocarpy IV. Inhibition of flowering II, III, IV I, III, IV III and IV I and II Ans:I and II
31	ABA has not been reported from Algae Bryophytes Pteris E.coli Ans: E.coli
32	Sprouting of Potato tubers can be prevented by the application of a hormone which is a Diterpene Monoterpene Sesquiterpene Tetraterpene Ans:Sesquiterpene
33	Ethylene is synthesized from Nitrogenous substance Acetyl Co.A Carotenoids Tryptophan 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 All except I All except II All except III All except IV Ans:All except IV
35	Choose the correct statement Ethylene promotes flowering ABA is formed from a nucleotide ABA is formed both catabolically and anabolically Ethylene is applied in tobacco crop for uniform fruit ripening 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 Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false A is false but R is true Ans:A is true but R is false
37	Choose the incorrect pair Potato crop – Stress hormone Pine Apple - Ethephon Ethylene - Skoog Dormancy hormone - Waring Ans:Ethylene - Skoog
38	C40H56O2 is involved in the synthesis of Senescence hormone Fruit ripening hormone Richmond-Lang effect hormone Bolting hormone Ans:Senescence hormone
39	Match the following A - I, B - II, C - V, D - III A - II, B - I, C - III, D - V A - III, B - I, C - IV, D - II A - II, B - I, C - V, D - III Ans:A - II, B - I, C - V, D - III
40	Study the following table and choose the correct combination All All except IV All except III I and II 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 I, II, III, IV I, III, II, IV IV, II, III, I I, IV, II, III 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 I and II I and IV II and III III and IV Ans:II and III
43	Secretions of sexual stage of Fusarium moniliformae promotes Seed germination Abscission Perennating bud formation Caulogenesis Ans:Seed germination
44	Natural Plant Growth Regulator is PAA BAP NAA PEP Ans:PAA
45	Match the following A - II, B - III, C - IV, D - V A - II, B - V, C - IV, D - I A - III, B - II, C - V, D - I A - II, B - IV, C - V, D - III Ans:A - II, B - V, C - IV, D - I
46	Duration of darkness mainly determines flowering in Spinach Beta vulgaris Zea Glycine max Ans:Glycine max
47	The influence of temperature is secondary for flowering in Cucumis Raphanus Mangifera Daucus 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 I and II III and IV II and III I and IV Ans:I and II
49	Match the following A - V, B - III, C - II, D - IV A - IV, B - III, C - II, D - I A - V, B - II, C - III, D - I A - V, B - III, C - II, D - I Ans:A - V, B - III, C - II, D - I
50	Study the following table and choose the correct combination II and III III and IV II and IV I and IV Ans:II and III