CBSE Questions for Class 11 Medical Biology Plant Growth And Development Quiz 2 - MCQExams.com

Which hormone is produced in most plant cells as product of metabolism?
  • Gibberellin
  • Cytokinin
  • Auxin
  • Ethylene
Gibberellins are
  • Proteinaceous
  • Amines
  • Acidic
  • Alkaline
Natural cytokinins are synthesized in tissues for
  • Differentiating
  • Senescent
  • Dividing
  • Storing food
Which hormone promotes rooting in cuttings
  • Gibberellin
  • Cytokinin
  • Auxin
  • None of the above
Cytokinins are byproducts of
  • Fat metabolism
  • Protein metabolism
  • Carbohydrate metabolism
  • Nucleic acid metabolism
Choose the correct answer from the alternatives given.
Closing of stomata are induced by:
  • axing
  • boxing
  • abscise acid
  • indole 3-acetic acid
When light falls on a part of the plant, a hormone called .......... which is synthesized at the tip of the shoot helps the cells to grow longer.
  • Gibberellins
  • Cytokinins
  • Ethylene
  • Auxin
The hormone which reduces transpiration rate by inducing stomatal closure is _________________.
  • ABA
  • ethylene
  • cytokinin
  • gibberellin.
Choose the correct answer from the alternatives given.
During germination of certain seeds, gibberellic acid activates the synthesis of:
  • starch
  • amylase
  • amylopectin
  • glycogen
The hormones which are found to be more effective in inducing parthenocarpy are
  • Cytokinins
  • Ethylene
  • Auxins
  • Ethephon
Indole acetic acid is a
  • Chemical found in the retina of nocturnal animals
  • Pesticide
  • Good fertilizer
  • Naturally occurring auxin
The movement or growth of any part of a plant in response to an external stimulus is called tropism or tropic movement.
  • True
  • False
Which of the following is a growth promoter hormone?
  • Auxin
  • Abscisic acid
  • Ethylene
  • Both $$B$$ and $$C$$
Gibberellins were first discovered in fungal genus
  • Mucor
  • Rhizopus
  • Agaricus
  • Fusarium
Which of the following are the products of redifferentiation?
  • Guard cells
  • Bulliform cells
  • Complimentary cells
  • Subsidiary cells
Evergreen trees remain green throughout the year on account of ..........
  • Absence of leaf fall
  • Leaves falling in small numbers at intervals
  • Supply of the moisture throughout the year
  • Cold climate
Rhizocaline is an additional hormonal substance which is secreted by
  • Cotyledons
  • Roots
  • Leaves
  • Stem
Plants differ from animals in having
  • Definite lifespan.
  • Localized growth.
  • Indefinite lifespan.
  • Localized growth and indefinite lifespan.
In vascular plants, light promotes
  • Growth
  • Development
  • Differentiation
  • All of the above
Maximum growth in roots occurs
  • At apex
  • In presence of light
  • Behind the apex
  • In presence of soil
Exogenous GA induces the formation of male flowers on genetically female plants of
  • Cucurbita
  • Luffa
  • Cannabis
  • Carica
Cytokinins
  • Promotes abscission
  • Influence water movement
  • Help retain chlorophyll
  • Inhibit protoplasmic streaming
Growth is maximum in the zone of
  • Cell division
  • Cell elongation
  • Cell maturation
  • All of the above
The plant material which is widely used in the preparation of culture medium is
  • Cycas revoluta
  • Cocos nucifera
  • Pinus longifolia
  • Borassus flabellifer
Which is produced during water stress that brings stomatal closure?
  • Ethylene
  • Abscissic acid
  • Ferulic acid
  • Coumarin
Falling of leaves occur as abscission layer is formed when the content of ...........
  • Auxin increases
  • Auxin decreases
  • Abscisic acid decreases
  • Gibberellic acid decreases
Indole-3-acetic acid called as auxin was first isolated from 
  • Human urine
  • Corn germ oil
  • Fusarium
  • Rhizopus
A well known naturally occurring auxin is or A natural growth regulator (hormone) is ........................
  • 2, 4 - D
  • Indole acetic acid
  • NAA
  • Maleic hydrazide
Which of the following movements is not related to change in auxin levels?
  • Nyctinastic leaf movement
  • Movement of roots towards soil
  • Movements of sunflower tracking the direction of the sun
  • Movement of shoot towards light
Parthenocarpy is induced by _______.
  • ABA
  • Auxins
  • Zeatin
  • Cytokinin
Highest concentration of auxins exist ...........
  • At the base of various plant organs
  • At growing tip of plants
  • In leaves
  • In xylem and phloem cell only
Which of the following is not a naturally occurring plant hormone?
  • 2, 4- D
  • GA$$_{2}$$
  • Gibberellin
  • IAA
Cell elongation in plants is caused by ....................... .
  • Auxin
  • Gibberellin
  • Florigen
  • Traumatin
Auxins were discovered by
  • Thimann
  • Went
  • Butler
  • Skoog
Which one of the following is considered as synthetic auxin?
  • NAA
  • IAA
  • GA
  • None of the above
Which one of the following hormones is not found in plants?
  • 2,4 - D
  • IAA
  • Gibberellin
  • None of the above
A high concentration of synthetic auxin is generally used for ....................
  • Control of cell enlargement
  • Weed control
  • Prevention of the growth of lateral buds
  • Enhancing root initiation
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?
  • Auxin treated cells lose selective permeability
  • ATP production increases and therefore much energy is available for active absorption
  • Auxin lowers the water potential of cells
  • None of the above
Pruning of plants promotes branching because the axillary buds get sensitized to
  • Ethylene
  • Gibberellin
  • Cytokinin
  • Indole acetic acid
Phototropism in shoots is attributed to ................
  • Auxin
  • Gibberellins
  • Cytokinins
  • Abscisic acid
Commonly used auxin in callus and suspension cultures, is .............
  • NAA
  • IBA
  • 2, 4-D
  • 2, 4, 5 - Trichlorophenoxy acetic acid
  • Abscisic acid
Auxins inhibits the growth of
  • Apical bud
  • Lateral axillary buds
  • Roots on stem cuttings
  • Parthenocarpic development of fruits
Pollen extract stimulates the formation of fruit in the unpollinated carpel because extract has which of the following hormone?
  • Auxin
  • Cytokinin
  • Gibberellin
  • Auxin and cytokinin
Plant hormone which is translocated to other parts for growth of the plant is known as .............
  • Indole acetic acid
  • Gibberellins
  • Cytokinins
  • None of the above
Auxin in plant is not meant for ................
  • Cell elongation
  • Fruit ripening
  • Cell division
  • Inhibit the root growth
6-furfuryl amino purine, 2,4-dichlorophenoxy acetic acid and indole-3-acetic acid are examples respectively for
  • Synthetic auxin, kinetin and natural auxin
  • Gibberellin, natural auxin and kinetin
  • Natural auxin, kinetin and synthetic auxin
  • Kinetin, synthetic auxin and natural auxin
  • Natural auxin, gibberellin and kinetin
The movement of auxin is largely 
  • Basipetal
  • Acropetal
  • Centripetal
  • Centrifugal
The substances which have proved very effective in inducing root from the cut end of the stem is
  • Phenyl acetic acid
  • $$\alpha $$-naphthalene acetic acid
  • Indole acetic acid
  • Indole butyric acid
IAA and serotonin are derived (formed) from which of the following?
  • Tryptophan
  • Tyrosine
  • Phenylalanine
  • None of these
Which of the following prevents falling of fruits?
  • GA$$_{3}$$
  • NAA
  • Ethylene
  • Zeatin
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