CBSE Questions for Class 11 Medical Biology Plant Growth And Development Quiz 12 - MCQExams.com

Match the columns and choose the correct option.
            I           II
(p) Control of weeds(i) Gibberellin
(q) Induction of germination(ii) Cytokinin
(r) Ripening of fruit(iii) 2, 4-D
(s) Delaying of senescence(iv) Ethylene
  • p - ii, q - iv, r - iii, s - i
  • p - iii, q - i, r - iv, s - ii
  • p - i, q - ii, r - iv, s - iii
  • p - ii, q - iii, r - i, s - iv
Which one is not a physiological effect of auxin?
  • Promotes bolting
  • Prevents early fruit and leaf drop
  • Promotes flowering
  • Initiates rooting in stem cuttings
  • Inhibits growth of lateral buds
Length of stalks of grape fruits increases due to
  • Auxin
  • Cytokinins
  • Ethylene
  • Gibberellin
Cytokinin is not found in
  • Root apex
  • Shoot apex
  • Young fruits
  • Mature fruits
One hormone stimulates the closure of stomata and another one influences the swelling of the axis in dicot plants. They are 
  • Gibberellins and ethylene
  • Abscisic acid and cytokinins
  • Gibberellins and cytokinins
  • Auxins and cytokinins
  • Abscisic acid and ethylene
Abscisic acid causes
  • Faster leaf fall
  • Dormancy of buds and seeds
  • Retardation of growth
  • All the above
6-(4-Hydroxy-3 Methyl-trans-2-butenylamine) purine is also called
  • Methyl jasmonate
  • Zeatin
  • Brasinolide
  • Triacontanol
A natural growth regulator is
  • 2, 4-D
  • Benzaldehyde
  • NAA
  • Ethylene
The characteristics like expansion, breaking dormancy, promoting germination and flowering are associated with
  • Auxins
  • Gibberellins
  • Cytokinins
  • Ethylene
Gibberellin facilitates seed germination by triggering the synthesis of
  • $$\alpha$$-amylase
  • $$\beta$$-amylase
  • Both A and B
  • $$\alpha$$-amylase and protease
Which of the following plant hormones reduces transpiration rate by inducing stomatal closure
  • Ethylene
  • Gibberellin
  • ABA
  • Cytokinin
One hormone hastens maturity period in juvenile conifers, a second hormone controls xylem differentiation while the third increases the tolerance of plants to various stresses. They are respectively
  • Auxin, gibberellin, ABA
  • Gibberellin, auxin, ABA
  • Auxin, gibberellin, cytokinin
  • Gibberellin, auxin, cytokinin
Bolting means
  • Elongation of stem in rosette plants
  • Dwarfing of stem
  • Increase in flowering
  • Appearance of flowers
The primary and secondary growth of a shoot is inhibited by
  • Auxin
  • Gibberellin
  • Cytokinin
  • Abscisic acid
Which of the following is the effect of a plant hormone, which is synthesised more in absence of light?
  • Inhibits the development of seedless fruits
  • Responsible for closing of stomata
  • Induces the dormancy of seeds
  • Length of intenodes increases
Match the column I with column II
  Column I  Column II
 A. Ethylene 1. Pigment
 B. Cytokinin 2. Growth inhibitor
 C. Phytochrome 3. Flowering hormone
 D. Florigen 4. Zeatin
  • A- 4, B- 3, C- 2, D- 1
  • A- 3, B- 4, C- 2, D- 1
  • A- 2, B- 4, C- 1, D- 3
  • A- 2, B- 1, C- 3, D- 4
On the basis of corelation, find the correct options from columns. 
Column IColumn-IIColumn III
I. Foolish plant(p) Volatile hormone
(i) Induces dormancy
II. Induces senescence (q) GA
(r) Zeatin		(ii) Ripen fruits
(iii) Usually sterile plant
  • I - p - ii , II - r- i
  • I - r - iii , II - q- iii
  • I - q - iii , II - p- ii
  • I - q - i , II - r- ii
Spraying sugarcane crop with a plant hormone increases length of plants and increases yield by as much as $$20$$ tonnes per acre. The hormone is
  • Gibberellin
  • Auxin
  • Cytokinin
  • ABA
The auxin commonly used in promoting rooting of cuttings is
  • NAAM
  • IBA
  • NAA
  • Both B and C
Plant tissues subjected to wounding is stimulated to secrete _______ .
  • Ethylene
  • Gibberalic acid
  • Auxin
  • Cytokinin
Which one is best to reduce the rate of water absorption and also acts as respiratory inhibitor?
  • IAA
  • KCM
  • Transpiration
  • Osmotic pressure of cell sap
The precursor of Serine and Cytokine is?
  • Oxalocetate
  • $$3$$-phosphoglycerate
  • Phosphoenolpyruvate
  • Erythrose-$$4$$-phosphate
The scientist Nitsch was able to get strawberries of different shapes by
  • Splitting the ovary
  • Removing the perianth
  • Selectively removing some carpels
  • Inserting an alcohol dipped needle into ovary
The aleurone synthesizes and secretes digestive enzymes that hydrolyse nutrients stored in the endosperm in the presence of.
  • Auxin
  • Gibberellin
  • Cytokinin
  • Ethylene
Which one of the following statements is not correct?
  • Roots produce gibberellins
  • The casparian strips in roots are involved in controlling the types of minerals that enter the xylem water starm
  • Lateral roots are initiated by cells division in the endodermis
  • When Rhizobium converts $$N_2$$ into nitrogenous compounds that are released into the host cells, energy is supplied by sugars from the legume roots cells
Which growth regulator is associated with increasing the cell number?
  • Auxin
  • Gibberellin
  • Ethylene
  • Cytokinin
Phytohormone responsible for overcome genetic dwarfism _________.
  • Auxin
  • Gibberellins
  • Cytokinins
  • ABA
Parthenocarpy has been introduced in eggplant by inserting a bacterial gene responsible for the synthesis of ______________.
  • Gibberellin
  • Cytokinin
  • Auxin
  • Abscis acid
Assertion (A): Tissues removed from crown gall tumours can be grown in culture without the addition of auxin and cytokinin.
Reason (R): The bacterial plasmid contains the genes for the synthesis of plant auxin and cytokinin.
  • Both A and Rare individually true and R is the correct explanation of A
  • Both A and Rare individually true and R is not the correct explanation of A
  • A is true but R is false
  • A is false but R is true Assertion
Which one of the following correctly describes trichothallic growth?
  • Growth due to the activity of a single apical cell
  • Growth due to the activity of a group of apical cells
  • Growth due to intercalary meristematic activity of cells at the base of hairs
  • Growth due to the activity of marginal meristematic cells of a filament
Match List I with List II and select the correct answer using the codes given the lists.
List-IList-II
a. Antigibberellin$$1$$. Scopoletin
b. Growth inhibitor$$2$$. Caffeic acid
c. Germination inhibitor$$3$$. Abscisic acid
d. IAA-oxidize inhibitor$$4$$. Cycocel
  • A-$$2$$, B-$$3$$, C-$$1$$, D-$$4$$
  • A-$$4$$, B-$$2$$, C-$$3$$, D-$$1$$
  • A-$$3$$, B-$$1$$, C-$$4$$, D-$$2$$
  • A-$$4$$, B-$$3$$, C-$$1$$, D-$$2$$
.......... is a plant hormone which inhibits growth leading to wilting of leaves.
  • Abscisic acid 
  • Gibberillins
  • Auxins
  • Cytokinins
The formation of gibberellins is necessary during the germination of barley seeds for the synthesis and secretion of hydrolase's. The gibberellins is formed in the _____________.
  • Endosperm
  • Aleuronic layer
  • Embryo
  • Scutellum
Consider the following statements regarding growth movements in plants.
a. Growth movements in flowering plants are always induced by external stimuli such as light and gravity.
b. Differential growth of cells in different parts of the affected organ is responsible for growth movement.
c. Growth movements are very slow and can be observed only through timelapse photography.
Of these statements.
  • $$1, 2$$ and $$3$$ are correct
  • $$1$$ and $$2$$ are correct
  • $$2$$ and $$3$$ are correct
  • $$1$$ and $$3$$ are correct
The growth of the shoot in the direction of source of light is an example of growth independent movement.
  • True
  • False
The movement of plant towards the direction of light is known as
  • Ciliary movement
  • Autotropic movement
  • Phototropic movement
  • Heterotropic movement
Which one of the following classes of plant hormones is the substitute for low temperature treatment?
  • Auxins
  • Gibberellins
  • Cytokine
  • Ethylene
The plant hormone produced by Rhizobium for nodulation is ___________.
  • IBA
  • NAA
  • 2, 4-D
  • IAA
What prevents over-ripening of banana and browning of cut fruits?
  • Gibberellic acid
  • Indole-3 acetic acid
  • Ascorbic acid
  • Abscisic acid
Hormone that is associated with retaining the chloroplast chlorophyll is ?
  • Auxin
  • ABA
  • Cytokinin
  • Gibberelins
Which one of the following generally acts as an antagonist to gibberellins?
  • Zeatin
  • Ethylene
  • ABA
  • IAA
Which of the following statements are correct?
a. Gibberellins can substitute light treatment
b. Gibberellins can convert biennials into annuals
c. Gibberellins favour flowering in long day plants
c. Gibberellins induce flowering in short day plants.
Select the correct answer.
  • $$1, 2, 3$$ and $$4$$
  • $$2$$ and $$4$$
  • $$1, 3$$ and $$4$$
  • $$1, 2$$ and $$3$$
The plant hormone which promotes parthenocarpy (formation of seedless fruit) is
  • Auxins
  • Gibberellins
  • Ethylene
  • Both A and B
The living differentiated cell which have lost capacity to divide can regain capacity of division under certain conditions. This phenomenon is called
  • De-differentiation
  • Differentiation
  • Re-differentiation
  • Regeneration
Which one is the main effect of auxin, important for commercial purpose?
  • Weed Killer
  • Parthenocarpy
  • Early rooting in stem cutting
  • None of these
Which of the following is the effect of a plant hormone, which is synthesized more in the absence of light?
  • Inhibits the development of seedless fruits
  • Responsible for closing of stomata
  • Induces the dormancy of seeds
  • Length of internodes increases
Ageing of leaves can be delayed by the application of _____.
  • Cytokinins
  • Sugars
  • Chlorophyll extract
  • Abscisic acis
Choose the correct answer from the alternatives given.
Apical dominance in plants is due to which of the following plant hormones:
  • ethylene
  • gibberellins
  • auxins
  • cytokinins
Choose the correct answer from the alternatives given.
Which of the following plant hormones is a growth inhibitor?
  • Abscisic acid
  • Auxin
  • Cytokinin
  • Gibberellin
Cytokinins helps to produce all except.
  • New leaves
  • Chloroplast in leaves
  • Lateral short growth and adventitious shoot foration
  • Rooting on cut stem
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Practice Class 11 Medical Biology Quiz Questions and Answers