CBSE Questions for Class 11 Medical Biology Plant Growth And Development Quiz 13 - MCQExams.com

Choose the correct answer from the alternatives given.
Application of which of the following hormones prevents plant tissues from senescing or ageing?
  • Abscisic acid
  • Auxin
  • Cytokinin
  • Ethylene
Choose the correct answer from the alternatives given.
Plant growth depends on:
  • cell division
  • hormones
  • cell enlargement
  • all of these
A hormone delaying senescence is _____________.
  • Auxin
  • Cytokinin
  • Ethylene
  • Gibberellin
I. Increase in mass II. Differentiation III. Increase in number of individuals. IV. Response to stimuli
Which two points are known as the twin characteristics of growth?
  • I and II
  • II and IV
  • II and III
  • I and III
Choose the correct answer from the alternatives given.
The classical experiment on growth was performed by:
  • Darwin and Boysen-Jensen
  • Garner and Allard
  • Yabuta and Sumiki
  • Skoog and Thiamann
Choose the correct answer from the alternatives given.
Which of the following is an effect of auxin?
  • Auxin production by seeds promotes the fruit growth
  • Trees sprayed with auxin will keep mature fruit from falling to the ground
  • Under the effect of gravity, auxin moves to the lower surface of roots and stems, causing roots to curve downward and stems to curve upward
  • All of the above
Choose the correct answer from the alternatives given.
Cytokinins
  • are plant hormones that promote cell division
  • are used in combination with auxin to produce plants from undifferentiated callose tissue.
  • also work with oligosaccharins to effect tissue differentiation
  • all of the above.
State whether the following statements are true or false.
There are about seventy chemical forms of the hormone group called the- gibberellins.
  • True
  • False
Cytokinins helps to produce all except
  • New leaves
  • Chloroplast in leaves
  • Lateral short growth and adventitious shoot formation
  • Rooting on cut stem
Ethylene promote water absorption by increasing root absorption surface. It promote
  • Premability of cell membrane
  • Formation of root hairs
  • Concentration of cell sap
  • All of these
An irreversible or permanent increase in size, mass or volume of a cell, organ or organism is called as ________.
  • growth
  • differentiation
  • dedifferentiation
  • development
Growth is maximum in zone of?
  • Cell elongation
  • Cell division
  • Cell maturation
  • All of these
Read the following statements regarding arithmetic growth and select the correct answer.
(i) Rate of growth is constant.
(ii) One daughter cell remains meristematic while the other one differentiates and matures.
(iii) Mathematical expression is $$L_t\,=\,L_0\,+\,rt$$.
  • Statements (i) and (ii) are correct.
  • Statements (ii) and (iii) are correct.
  • Statements (i) and (ii) are correct
  • All statements are correct.
Physiological function not affected by ABA is
  • Abscission
  • Senescence
  • Dormancy
  • Flowering
Apical dominance in dicot plants is due to the presence of more_________ in the apical bud than in the lateral ones.
  • Auxins
  • Cytokinin
  • Gibberellins
  • Ethylene
Increased vacuolation, cell enlargement and new cell wall deposition are the characteristics of cells in phase of growth.
  • Meristematic
  • Elongation
  • Maturation
  • Differentiation
The factors which influence growth are ___________.
  • nutrients
  • water, oxygen
  • light, temperature
  • all of these.
Cells of tracheary elements (tracheids and vessels) become dead at maturity and lose their protoplasm due to the deposition of lignocellulosic cell wall thickenings. This is an example of
  • Growth
  • Differentiation
  • Dedifferentiation
  • Redifferentiation
 Which of the following is an example of differentiation?
  • Lignocellulosic wall thickenings of tracheids
  • Loss of nucleus, vacuolisation and end wall perforations in sieve tube elements
  • Elongation, thickening and emptying of sclerenchyma fibres
  • All of the above
Growth in plants is
  • Only determinate
  • Only indeterminate
  • Mostly determinate
  • Both determinate and indeterminate
__________ are the examples of tissues, formed by dedifferentiation.
  • Interfascicular cambium
  • Cork cambium
  • Both (a) and (b)
  • Tracheary elements
Examples of tissues that are formed by redifferentiation are
  • Secondary xylem
  • Secondary phloem
  • Cork cell
  • All of these
Select the pair that consists of plant growth promoters only.
  • Auxins and cytokinins
  • Gibberellins and ABA
  • Ethylene and ABA
  • All of these
Living differentiated cells which have otherwise lost the capacity to divide, can regain the power of division under certain conditions. This phenomenon is termed as
  • Differentiation
  • Dedifferentiation
  • Redifferentiation
  • Development
Which of the following is both a growth promoter as well as a growth inhibitor?
  • Auxin
  • Gibberellins acid
  • ABA
  • Ethylene
If a part of pith from the stem of a plant is used as an explant and cultured on nutrient medium, which of the following processes is responsible for the formation of an undifferentiated mass of cells called callus?
  • Growth
  • Differentiation
  • Dedifferentiation
  • Redifferentiation
The dedifferentiated cells mature to form some specific cells to perform specific functions, this is referred to as
  • Differentiation
  • Dedifferentiation
  • Redifferentiation
  • Development
Cytokinins are mostly ____________.
  • glucosides
  • phenolics
  • amino purines
  • organic acids.
Gibberellin was first extracted from _____________.
  • Gibberella fujikori
  • Gelidium
  • Graciaria
  • Aspergillus
internodal elongation is stimulated by ______________.
  • auxin
  • ABA
  • cytokinin
  • gibberellin.
 The term 'auxin precursor' refers to _________________.
  • raw material used in the synthesis of auxin
  • compound which inhibits the action of auxin
  • artificially synthesised auxin
  • active form of auxin.
Read the given statements and select the correct option.
(i) Darwin and Darwin (1880) found that sensation of unilateral illumination was perceived by the coleoptile tip of canary grass.
(ii) IAA is universal natural auxin, discovered by Kogl et al.
(iii) IBA is both natural and synthetic auxin.
(iv) Auxins promote the growth of lateral shoots.
  • Statements (i) and (ii) are correct.
  • Statements (ii) and (iii) are correct.
  • Statements (i), (ii) and (iii) are correct.
  • Statements (i), (ii), (iii) and (iv) are correct.
Spraying sugarcane with gibberellins increases the yield  by as much as 20 tonnes per acre. GA performs it by
  • improving the quality of fruit
  • increasing sugar content
  • internodal elongation
  • delaying senescence.
The fruits can be left on the tree longer using GA so as to extend the market period. This is due to which function of GA?
  • Bolting
  • Delaying senescence
  • Internodal elongation
  • Inducing parthenocarpy
Artificial application of auxins like IAA, IBA, and NAA to unpollinated pistils can form
  • fruits with much flesh
  • larger fruits
  • sweet fruits
  • seedless fruits
Functions of auxins include
  • Promoting flowering in pineapple
  • Inducing parthenocarpy in tomato
  • Use as herbicides to kill dicot weeds
  • All of these
Which of the following statements regarding gibberellins is incorrect?
  • $$GA_3$$ was one of the first gibberellins to be discovered
  • All GA are acidic
  • They increase the length of plant axis as in grapes, sugarcanes etc
  • They promote senescence
The term 'antiauxin' refers to _________________.
  • raw material used in the synthesis of auxin
  • compound which inhibits the action of auxin
  • artificially synthesised auxin
  • active form of auxin.
The hormone which was discovered through the foolish seedling disease of rice is ________.
  • Indole-3-acetic acid
  • Ethylene
  • Gibberellic acid
  • Kinetin
Bolting, i.e., internode elongation lust prior to flowering in beet, cabbage, and many rosette plants, is promoted by
  • auxins
  • gibberellins
  • cytokinins
  • ethylene.
Which of the following physiological effects is caused in plants by gibberellic acid?
  • Shortening of genetically tall plants
  • Elongation of genetically dwarf plants
  • Rooting in stem cuttings
  • Yellowing of young leaves
Natural cytokinins are synthesized in regions where rapid cell division occurs. Such regions are
  • Root apices
  • Developing shoot buds
  • Young fruits
  • All of these.
A plant hormone used for Inducing morphogenesis in plant tissue culture is ______________.
  • abscisic acid
  • gibberellin
  • cytokinin
  • ethylene.
Match column I with column II and select the correct option from the codes given below.
Column IColumn II
A.Natural auxin(i)NAA
B.Synthetic auxin(ii)Zeatin
C.Bakane disease of rice(iii)IAA
D.Natural cytokinin(iv)GA
(v)Kinetin
  • A - (iii), B - (i), C - (iv), D - (ii)
  • A - (i), B - (iii), C - (iv), D - (v)
  • A - (iii), B - (i), C - (iv), D - (v)
  • A - (iv), B - (i), C - (v), D - (ii)
In addition to auxins, ................ must be supplied to the culture medium to obtain a good callus in plant tissue culture.
  • ABA
  • Cytokinins
  • Gibberellins
  • Ethylene
Cytokinins help to produce all except
  • New leaves
  • Chloroplast in leaves
  • Lateral shoot growth and adventitious shoot formation
  • Rooting on the cut stem
Hormone primarily concern with cell division is
  • IAA
  • NAA
  • Cytokinin
  • Gibberellic acid.
The activity of $$\alpha$$-amylase in the endosperm of a germinating seed of barley is induced by
  • Ethylene
  • Cytokinin
  • IAA
  • Gibberellin
Hormone that promotes growth of lateral buds and has negative effect on apical dominance is
  • Cytokinin
  • Gibberellin
  • Auxin
  • Both (b) and (c).
Which phytohormone would you use if you are asked to 'bolt' a rosette plant?
  • Auxins
  • Gibberellins
  • Cytokinins
  • Any of these
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