NEET Biology Plant Growth and Development / पौधे की वृद्धि और विकास Question Bank

done Auxin Total Questions - 79

• question_answer1)
  Leaf fall occurs on abscission layer is formed when the content of [CPMT 1981, 84; AIIMS 1990; MP PMT 1996]
  A)
  Auxin increases done clear
  B)
  Auxin decreases done clear
  C)
  Abscisic acid decreases done clear
  D)
  Gibberellic acid decreases done clear
  View Solution play_arrow

• question_answer2)
  Auxins were discovered by [BHU 1988]
  A)
  Thimman done clear
  B)
  Went done clear
  C)
  Butler done clear
  D)
  Skoog done clear
  View Solution play_arrow

• question_answer3)
  Apical dominance in higher plants is due to [MP PMT 1986]
  A)
  Balance between auxin and cytokinin done clear
  B)
  Enzyme activity and metabolism done clear
  C)
  Carbohydrates done clear
  D)
  Photoperiodism done clear
  View Solution play_arrow

• question_answer4)
  Cell elongation in plants is caused by [MP PMT 1989; CPMT 1994, 95]
  A)
  Auxin done clear
  B)
  Gibberellin done clear
  C)
  Florigen done clear
  D)
  Traumatin done clear
  View Solution play_arrow

• question_answer5)
  Indole-3-acetic acid called as auxin was first isolated from [CPMT 1990]
  A)
  Human urine done clear
  B)
  Corn germ oil done clear
  C)
  Fusarium done clear
  D)
  Rhizopus done clear
  View Solution play_arrow

• question_answer6)
  Which of the following movements is not related to change in auxin levels [CBSE PMT 1990]
  A)
  Nyctinastic leaf movement done clear
  B)
  Movement of roots towards soil done clear
  C)
  Movement of sunflower tracking the direction of the sun done clear
  D)
  Movement of shoot towards light done clear
  View Solution play_arrow

• question_answer7)
  Parthenocarpy is induced by [AIIMS 1990; KCET 1994]
  A)
  ABA done clear
  B)
  Auxins done clear
  C)
  Zeatin done clear
  D)
  Cytokinin done clear
  View Solution play_arrow

• question_answer8)
  Who among the following discovered the Avena curvature test to find out the concentration of auxins [CPMT 1990]
  A)
  F.W. Went done clear
  B)
  L.J. Audus done clear
  C)
  K.V. Thimman done clear
  D)
  F. Skoog done clear
  View Solution play_arrow

• question_answer9)
  High concentration of synthetic auxins would [CPMT 1979; DPMT 1982]
  A)
  Kill plants done clear
  B)
  Prevent lateral buds to grow done clear
  C)
  Control cell division done clear
  D)
  Cause photoperiodism done clear
  View Solution play_arrow

• question_answer10)
  Which of the following is not naturally occurring plant hormone  [CPMT 1980, 84, 99; MP PMT 1996; JIPMER 2001]
  A)
  2, 4-D done clear
  B)
  \[G{{A}_{2}}\] done clear
  C)
  Gibberellin done clear
  D)
  IAA done clear
  View Solution play_arrow

• question_answer11)
  Highest concentration of auxins exist in [CBSE PMT 1990; MP PMT 2000]
  A)
  At the base of various plant organs done clear
  B)
  Growing tip of plants done clear
  C)
  In leaves done clear
  D)
  In xylem and phloem cells only done clear
  View Solution play_arrow

• question_answer12)
  A well-known naturally occurring auxin is or A natural growth regulator (hormone) is [CPMT 1985; DPMT 1986]
  A)
  2, 4-D done clear
  B)
  Indole acetic acid done clear
  C)
  NAA done clear
  D)
  Maleic hydrazide done clear
  View Solution play_arrow

• question_answer13)
  A  high concentration of synthetic auxin is generally used for [DPMT 1985]
  A)
  Control of cell enlargement done clear
  B)
  Weed control done clear
  C)
  Prevention of the growth of lateral buds done clear
  D)
  Enhancing root initiation done clear
  View Solution play_arrow

• question_answer14)
  The primary precurser of IAA is [DPMT 1981; CPMT 1990]
  A)
  Phenyl alanine done clear
  B)
  Tyrosine done clear
  C)
  Tryptophan done clear
  D)
  Leucine done clear
  View Solution play_arrow

• question_answer15)
  Auxins inhibits the growth of [CPMT 1990]
  A)
  Apical bud done clear
  B)
  Lateral axillary buds done clear
  C)
  Roots on stem cuttings done clear
  D)
  Parthenocarpic development of fruits done clear
  View Solution play_arrow

• question_answer16)
  Phototropism in shoots is attributed to [CPMT 1982; MP PMT 1987]
  A)
  Auxin done clear
  B)
  Gibberellins done clear
  C)
  Cytokinins done clear
  D)
  Abscisic acid done clear
  View Solution play_arrow

• question_answer17)
  In unisexual plants, sex can be changed by the application of [BHU 1982]
  A)
  Ethanol done clear
  B)
  Auxins done clear
  C)
  Cytokinin done clear
  D)
  ABA done clear
  View Solution play_arrow

• question_answer18)
  Most of the information regarding auxins have been obtained from
  A)
  Rice plant done clear
  B)
  Maize grains done clear
  C)
  Avena coleoptile done clear
  D)
  Wheat ear done clear
  View Solution play_arrow

• question_answer19)
  The formula of auxin 'a' is
  A)
  \[{{C}_{18}}\] \[{{H}_{30}}\] done clear
  B)
  \[{{C}_{18}}\] \[{{H}_{32}}\] done clear
  C)
  \[{{C}_{18}}\] \[{{H}_{32}}\] \[{{O}_{5}}\] done clear
  D)
  \[{{C}_{18}}\] \[{{H}_{40}}\] \[{{O}_{10}}\] done clear
  View Solution play_arrow

• question_answer20)
  Phenyl acetic acid is a
  A)
  Natural plant hormone done clear
  B)
  A synthetic growth hormone done clear
  C)
  Antihormone compound done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer21)
  NAA is
  A)
  Nicotinic acid done clear
  B)
  Nitroacetic acid done clear
  C)
  Naphthalene acetic acid done clear
  D)
  Naphthalene acetic anhydride done clear
  View Solution play_arrow

• question_answer22)
  Which of the following has auxin like property
  A)
  a-naphthalene acetic acid done clear
  B)
  b-naphthalene acetic acid done clear
  C)
  Both [a] and [b] done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer23)
  Which of the following is 2, 4-D
  A)
  2, 4 dichloroacetic acid done clear
  B)
  2, 4 dichloroacetaldehyde done clear
  C)
  2, 4 dichloropropane done clear
  D)
  2, 4 dichlorophenoxy acetic acid done clear
  View Solution play_arrow

• question_answer24)
  Indole propionic acid is a
  A)
  Toxic substance done clear
  B)
  Acid obtained from fruits done clear
  C)
  A substance obtained from hormone done clear
  D)
  A derivative of carbohydrate done clear
  View Solution play_arrow

• question_answer25)
  The place where auxins are active is
  A)
  Tip of stem done clear
  B)
  Growing fruit done clear
  C)
  Growing embryo done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer26)
   According to F. Went, auxins transmit
  A)
  From apex to downward done clear
  B)
  Opposite to A done clear
  C)
  From centre to periphery done clear
  D)
  Opposite to C done clear
  View Solution play_arrow

• question_answer27)
  A practical application of an auxin is to induce
  A)
  Germination done clear
  B)
  Transpiration done clear
  C)
  Respiration done clear
  D)
  Photosynthesis done clear
  View Solution play_arrow

• question_answer28)
  The fruits and leaves fall before maturity in absence of
  A)
  Auxin done clear
  B)
  Gibberellin done clear
  C)
  Cytokinin done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer29)
  In tobacco, enzymatic activity can be retarded by
  A)
  Minerals done clear
  B)
  Auxins done clear
  C)
  By more \[{{N}_{2}}\] done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer30)
  BA is a
  A)
  Auxin done clear
  B)
  Gibberellin done clear
  C)
  Kinetin done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer31)
  The substances which have proved very effective to induce rooting from cut end of the stem is [EAMCET 1995; BHU 1999; Pb. PMT 2000]
  A)
  Phenyl acetic acid done clear
  B)
  a-naphthalene acetic acid done clear
  C)
  Indole acetic acid done clear
  D)
  Indole butyric acid done clear
  View Solution play_arrow

• question_answer32)
  The number of auxins received from Phaseolus vulgaris is
  A)
  2 done clear
  B)
  3 done clear
  C)
  4 done clear
  D)
  8 done clear
  View Solution play_arrow

• question_answer33)
  Which of the following effects of auxins on plants is the basis for commercial application [CPMT 1985]
  A)
  Callus formation done clear
  B)
  Curvature of stem done clear
  C)
  Induction of root formation in stem cuttings done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer34)
  2, 4-D is a [MP PMT 1986, 87; CPMT 1996; BHU 2002; Manipal 2005]
  A)
  Insecticide done clear
  B)
  Weedicide done clear
  C)
  Nematicide done clear
  D)
  Rodenticide done clear
  View Solution play_arrow

• question_answer35)
  Plant hormone which is translocated to other parts for growth of the plant is known as [AFMC 1980]
  A)
  Indole acetic acid done clear
  B)
  Gibberellins done clear
  C)
  Cytokinins done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer36)
  Classical experiments on growth were performed by [NCERT 1980]
  A)
  Lamarck and Boysen-Jennsen done clear
  B)
  Boysen-Jennsen and Darwin done clear
  C)
  Darwin and Lamarck done clear
  D)
  de Vries and Paul done clear
  View Solution play_arrow

• question_answer37)
   Bioassay for auxin is [NCERT 1980; RPMT 1999; BHU 2005]
  A)
  Avena curvature test done clear
  B)
  Green leaf test done clear
  C)
  Dwarf maize test done clear
  D)
   Cell division test done clear
  View Solution play_arrow

• question_answer38)
  Substances which originate at the tip of the stem and control growth elsewhere are [AFMC 1986; CPMT 1993]
  A)
  Food material done clear
  B)
  Auxins or hormones done clear
  C)
  Vitamins done clear
  D)
  Enzymes done clear
  View Solution play_arrow

• question_answer39)
  Auxins are [CPMT 1984, 85]
  A)
  Growth catalysts done clear
  B)
  Destroyers of growth done clear
  C)
  Growth hormones done clear
  D)
  Inhibitors of growth done clear
  View Solution play_arrow

• question_answer40)
  Auxins are abundantly produced in [CPMT 1984; CBSE PMT 1990]
  A)
  Root done clear
  B)
  Meristematic region of the root done clear
  C)
  Shoot done clear
  D)
  Meristematic region of the shoot done clear
  View Solution play_arrow

• question_answer41)
  A substance which accelerates the growth in stem is [CPMT 1977]
  A)
  Etiolin done clear
  B)
  Auxin done clear
  C)
  Vitamin done clear
  D)
  Enzyme done clear
  View Solution play_arrow

• question_answer42)
  In plants auxin synthesis occurs in [MP PMT 1994; CPMT 1999; KCET 2000]
  A)
  Cortex done clear
  B)
  Phloem cells done clear
  C)
  Root and shoot tips done clear
  D)
  Xylem cells done clear
  View Solution play_arrow

• question_answer43)
  Which of the following is not a characteristic of auxin
  A)
  Polar translocation done clear
  B)
  Delay in abscission done clear
  C)
  Apical dominance done clear
  D)
  Induce lateral bud formation done clear
  View Solution play_arrow

• question_answer44)
  See the following Above structure is of an auxin, that is
  A)
  IAA done clear
  B)
  Auxin b done clear
  C)
  Auxin a done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer45)
  Apical dominance is caused by [BHU 1995, 99; MP PMT 2000]
  A)
  Auxin done clear
  B)
  Gibberellin done clear
  C)
  Kinetin done clear
  D)
  ABA done clear
  View Solution play_arrow

• question_answer46)
  Avena coleoptile test detects the presence of [RPMT 1999; JIPMER 2002]
  A)
  IAA done clear
  B)
  GA done clear
  C)
  NAA done clear
  D)
  BA done clear
  View Solution play_arrow

• question_answer47)
  IAA stands for
  A)
  Indole-3-acetic anhydride done clear
  B)
  Indole-3-acetic acid done clear
  C)
  Indole-3-acetic acetate done clear
  D)
  Indole-3-acetoacetic acid done clear
  View Solution play_arrow

• question_answer48)
  Auxin-B was first isolated by
  A)
  Kogl and Erxlaben done clear
  B)
  Kogl, Erxlaben and Hagen Smit done clear
  C)
  Miller and Skoog done clear
  D)
  Yabuta and Sumiki done clear
  View Solution play_arrow

• question_answer49)
  Low concentration of auxin lowers the growth of
  A)
  Root done clear
  B)
  Stem done clear
  C)
  Leaves done clear
  D)
  Dicot plants done clear
  View Solution play_arrow

• question_answer50)
  Formation of auxin is checked by
  A)
  Photosynthesis done clear
  B)
  Photo-oxidation done clear
  C)
  Phototropism done clear
  D)
  Darkness done clear
  View Solution play_arrow

• question_answer51)
  Which of the following accelerates apical meristem and exerts direct effect on the growth of plant axis in length
  A)
  Cytokinin done clear
  B)
  Ethylene done clear
  C)
  Gibberellin done clear
  D)
  Auxin done clear
  View Solution play_arrow

• question_answer52)
  What happens when auxin is applied to the tip of a cut stump
  A)
  Tip is burnt done clear
  B)
  Flower is produced done clear
  C)
  Leaves are instantly developed done clear
  D)
  Callus is formed done clear
  View Solution play_arrow

• question_answer53)
  What is the cause of excurrent habit in Pinus [AIIMS 1987]
  A)
  Presence of gibberellin done clear
  B)
  Presence of apical dominance done clear
  C)
  High concentration of cytokinin done clear
  D)
  High concentration of ABA done clear
  View Solution play_arrow

• question_answer54)
  Pruning makes the hedge plant dense because [AIIMS 1984]
  A)
  Injury induces dense growth done clear
  B)
  Apical dominance is removed done clear
  C)
  Root sprouts additional branches done clear
  D)
  Pruning removes shade and allows germination of new seedlings to impart a dense growth done clear
  View Solution play_arrow

• question_answer55)
  Which one of the following plant function is not generally governed or controlled by auxin [RPMT 1985]
  A)
  Apical dominance done clear
  B)
  Phototropism done clear
  C)
  Photosynthesis done clear
  D)
  Growth done clear
  View Solution play_arrow

• question_answer56)
  If the concentration of IAA is increased in the roots of a plant, the absorption of water would
  A)
  Increase done clear
  B)
  Decrease done clear
  C)
  First decrease then increase done clear
  D)
  Remain unaffected done clear
  View Solution play_arrow

• question_answer57)
  Seedless fruits can be obtained by treating a plant with [CPMT 1985]
  A)
  Enzyme done clear
  B)
  Auxin done clear
  C)
  Vitamin done clear
  D)
  \[70{}^\circ C\] and light done clear
  View Solution play_arrow

• question_answer58)
  Banana is a parthenocarpic fruit because
  A)
  It is 3n done clear
  B)
  It is vegetatively propagated done clear
  C)
  Its ovary has high levels of auxin done clear
  D)
  It is treated with hormones done clear
  View Solution play_arrow

• question_answer59)
  Flowering in pineapple is promoted by
  A)
  NAA done clear
  B)
  \[G{{A}_{3}}\] done clear
  C)
  Short days done clear
  D)
  Cytokinin done clear
  View Solution play_arrow

• question_answer60)
  Storage sprouting of potato tubers can be prevented by treatment with low concentrations of
  A)
  Nicotinamide done clear
  B)
  Naphthalene acetic acid done clear
  C)
  Nitrogenous fertilizer done clear
  D)
  Natural sunlight done clear
  View Solution play_arrow

• question_answer61)
  During germination, stem grows upward and root goes downward because [CPMT 1995]
  A)
  It depends upon light done clear
  B)
  Of auxin done clear
  C)
  It does not depend on light done clear
  D)
  Of epinasty and hyponasty done clear
  View Solution play_arrow

• question_answer62)
  The presence of auxins in a solution could be tested by [MP PMT 1999]
  A)
  Avena sativa stem tip test done clear
  B)
  Carbon tetrachloride test done clear
  C)
  Iodine test done clear
  D)
  Defoliation test done clear
  View Solution play_arrow

• question_answer63)
  Which of the following ion is pulled out in apoplast by the auxin during growh [CPMT 1999]
  A)
  \[N{{a}^{+}}\] done clear
  B)
  \[{{K}^{+}}\] done clear
  C)
  \[M{{g}^{2+}}\] done clear
  D)
  \[{{H}^{+}}\] done clear
  View Solution play_arrow

• question_answer64)
  One of the preventive methods of fruit drop is by spraying [KCET 1998]
  A)
  Auxin done clear
  B)
  Ethylene gas done clear
  C)
  Gibberellins done clear
  D)
  Cytokinine done clear
  View Solution play_arrow

• question_answer65)
  Which one among the following chemical is used for causing defoliation of forest trees [CBSE PMT 1998]
  A)
  Amo-1618 done clear
  B)
  Phosphon-D done clear
  C)
  Maleic hydrazide done clear
  D)
  2, 4-D done clear
  View Solution play_arrow

• question_answer66)
  Which of the following is an auxin [RPMT 1997]
  A)
  Maleic acid done clear
  B)
  Abscisic acid done clear
  C)
  Pyruvic acid done clear
  D)
  Indole acetic acid done clear
  View Solution play_arrow

• question_answer67)
  Abscission of fruits is prevented by [Pb. PMT 1999; RPMT 1999]
  A)
  ABA done clear
  B)
  Ethylene done clear
  C)
  Cytokinin done clear
  D)
  IBA done clear
  View Solution play_arrow

• question_answer68)
  Differentiation of shoot is controlled by [CBSE PMT 1999]
  A)
  High gibberellin : Cytokinin ratio done clear
  B)
  High cytokinin : auxin ratio done clear
  C)
  High auxin : cytokinin ratio done clear
  D)
  High gibberellin : auxin ratio done clear
  View Solution play_arrow

• question_answer69)
  The movement of auxin is largely [CBSE PMT 2000]
  A)
  Basipetal done clear
  B)
  Acropetal done clear
  C)
  Centripetal done clear
  D)
  Centrifugal done clear
  View Solution play_arrow

• question_answer70)
  Which of the following prevents falling of fruits [CBSE PMT 2001]
  A)
  \[G{{A}_{3}}\] done clear
  B)
  NAA done clear
  C)
  Ethylene done clear
  D)
  Zeatin done clear
  View Solution play_arrow

• question_answer71)
  Synthetic auxins are used for [Kerala CET 2003]
  A)
  Killing weeds done clear
  B)
  Ripening fruits  done clear
  C)
  Increasing the size of the fruits done clear
  D)
  Stimulating growth of cells in tissue culture done clear
  View Solution play_arrow

• question_answer72)
  Auxin in plant is not means for [BHU 2003]
  A)
  Cell elongation done clear
  B)
  Fruit ripening done clear
  C)
  Cell division done clear
  D)
  Inhibit the root growth done clear
  View Solution play_arrow

• question_answer73)
  Apical dominance in plant is caused by [AIEEE 2004]
  A)
  High concentration of auxins in the terminal bud done clear
  B)
  High concentration of gibberellins in the apical bud done clear
  C)
  High concentration of auxins in the lateral bud done clear
  D)
  Absence of auxins and gibberellins in the apical bud done clear
  View Solution play_arrow

• question_answer74)
  Which one of the following hormones is not found in plants [BVP 2002]
  A)
  2, 4-D done clear
  B)
  \[G{{A}_{2}}\] done clear
  C)
  Gibberellin done clear
  D)
  IAA done clear
  View Solution play_arrow

• question_answer75)
  Auxin herbicide is [BVP 2001]
  A)
  NAA done clear
  B)
  IAA done clear
  C)
  2, 4-D done clear
  D)
  IBA done clear
  View Solution play_arrow

• question_answer76)
  The hormone involved in metabolism of food material in cereal grain during germination, is [BVP 2004]
  A)
  Auxin done clear
  B)
  Cytokinin done clear
  C)
  Gibberellin acid done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer77)
  Pollen extract stimulates the formation of fruit in the unpollinated carpel because extract has the following hormone [AMU 2005]
  A)
  Auxin done clear
  B)
  Cytokinin done clear
  C)
  Gibberellin done clear
  D)
  Auxin and cytokinin done clear
  View Solution play_arrow

• question_answer78)
  Levitt performed experiments. He observed that auxin treated cells were able to absorb water even when kept in hypertonic solution. Which explains this observation best [Manipal 2005]
  A)
  Auxin treated cells lose selective permeability done clear
  B)
  ATP production increases and therefore much energy is available for active absorption done clear
  C)
  Auxin lowers the water potential of cells done clear
  D)
  Auxin increases the solute potential of cells done clear
  View Solution play_arrow

• question_answer79)
  Both in callus and suspension cultures commonly used auxin is [Kerala CET 2005]
  A)
  NAA done clear
  B)
  IBA done clear
  C)
  2-4 D done clear
  D)
  2,4,5-Trichlorophenoxy acetic acid done clear
  E)
  Absicisic acid done clear
  View Solution play_arrow