-
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