CBSE Questions for Class 11 Medical Biology Plant Growth And Development Quiz 10 - MCQExams.com

High C/N ratio produces
  • Softer tissues
  • More mechanical tissues
  • More growth hormones
  • Growth inhibitors
An excised leaf does not turn yellow if it is induced to root. This is attributed to the synthesis in root of
  • Ethylene
  • Cytokinins
  • Gibberellins
  • Auxins
The rosette habit of cabbage can be changed drastically by the application of
  • GA
  • IAA
  • ABA
  • CK
Gibberellins were first extracted from
  • Coleoptile tip
  • Root tip
  • Fungus
  • Bacterium
Internodal elongation is promoted by the action of
  • Auxin
  • Gibberellic acid
  • Cytokinin
  • Abscisic acid
Cytokinins are generally
  • Acids
  • Aminopurines
  • Phenols
  • Glucosides
Hormone involved in inhibition of growth is
  • ABA
  • Ethylene
  • None of the above
  • Both A and B
Hormone involved in breaking dormancy of winter buds is
  • Ethylene
  • Gibberellin
  • Auxin
  • Cytokinin
Rapid growth of flowering axis in many plants is caused by
  • Lower level of abscisic acid
  • Higher level of auxin
  • Higher level of gibberellin
  • Lower level of auxin
Gibberellins take part in
  • Bolting of rosette plants
  • Replacing long day requirement
  • Overcoming genetic dwarfism
  • All the above
Cytokinins are mostly produced in
  • Shoot apex
  • Root apex
  • Young leaves
  • Lateral buds
The growth hormone, Gibberellin, was discovered by
  • Yabuta and Sumiki
  • Dutrochet and Dolk
  • Donoho and Walker
  • Hashimoto and Rappaport
Scientist who first isolated cytokinin was
  • White
  • Skoog
  • Letham
  • Miller
Delay in senescence is caused by the spray of 
  • IBA
  • GA
  • Cytokinin
  • ABA
Cell mitosis is induced by
  • Colchicine
  • Gibberellic acid
  • Nitrosoguanidine
  • Kinetin
If auxin concentration is increased in plant roots, the water absorption will
  • Increase
  • Decrease
  • Remain the same
  • None
During wall enlargement new wall materials are inserted amongst the older ones.The phenomenon is
  • Accretion
  • Integration
  • Intussusception
  • Interpolation
Leaf abscission is prevented by
  • Gibberellin
  • Ethylene
  • Abscisic acid
  • Auxin
Kinetin like properties are present in
  • Pineapple
  • Soyabean
  • Groundnut
  • Coconut milk
Leaf fall occurs when
  • Auxin content is more in lamina than in the stem
  • Auxin content is low in the lamina as compared to stem
  • Abscisic acid is formed
  • Morphactins are produced
Leaf abscission is promoted by
  • Ethylene
  • Abscisic acid
  • Cytokinin
  • Tryptophan
Name the scientist who discovered that decapitated coleoptile would resume photosensitivity and growth if severed tip is reattached through a gelatin disc
  • Darwin
  • Van Overbeek
  • Boyson Jensen
  • Paal
Gibberellic acid has been successfully employed to induce flowering
  • In short day plats under long day conditions
  • In long day plants under short day conditions
  • In all plants
  • None of the above
Fruit drop occurs when fruit has
  • No auxin as in the stem
  • Less auxin as compared to stem
  • More auxin than the one present in the stem
  • Auxin concentration equal to that of stem
Flowering in some short day plants is promoted by
  • Auxins
  • Gibberellins
  • Cytokinins/ABA
  • Ethylene
The shoot system of any plant responds towards the stimulus of:
  • Air
  • Light
  • Water
  • Soil
Phototropic and geotropic movements are linked to
  • Gibberelins
  • Cytokinins
  • Auxin
  • None of the above
Which of the following stimulates growth or cell enlargement?
  • Gibberellin
  • Auxin
  • Cytokinin
  • Ethylene
Cytokinins have the ability to
  • Induce morphogenesis
  • Substitute cold treatment
  • Convert dwarf plants to tall plants
  • None of the above
Auxin does not increase
  • The plasticity of cell walls
  • The rate of photosynthesis
  • The uptake of water by cells
  • Rate of respiration
What causes a green plant to bend towards light as it grows?
  • Because green plants need light to carry on photosynthesis
  • Because green plants are phototropic
  • Light stimulates plant cells on the lighted side to grow faster
  • Auxin accumulates on shaded side stimulating greater cell elongation
Exactly opposite response of stem and root to gravity is because of
  • Requirement of differential optimum concentration of auxin for elongation of stem and root cells
  • Nature of these organs
  • Position effect of these organs since embryonic stage in seed
  • None of the above
Weed killers have properties similar to
  • Hormones
  • Enzymes
  • Insecticides
  • Vitamins
Hormone involved in phototropism is
  • IAA
  • Gibberellin
  • Kinetin
  • 2, 4-D
Leaf fall occurs when content of
  • Abscisic acid decreases
  • Auxin decreases
  • Auxin increases
  • Gibberellin decreases
Bioassay of IAA is
  • Avena curvature test
  • Callus test
  • Leaf disc test
  • $$\alpha$$-amylase test
Abscisic acid controls
  • Cell division
  • Leaf fall and dormancy
  • Shoot elongation
  • Cell elongation and wall formation
Hormone primarily connected with cell division is
  • IAA
  • NAA
  • Cytokinin/Zeatin
  • Gibberellic acid
Which one is the test for gibberellin?
  • Bolting in Cabbage
  • Morphogenesis in tobacco callus
  • Rapid division in Carrot cells
  • Elongation of Oat coleoptile
Auxin suppresses growth of
  • Lateral axillary buds
  • Apical buds
  • Roots on stem cuttings
  • Parthenocarpy
Genetic dwarfness can be overcome by treating the plant with
  • Cytokinin
  • Gibberellic acid
  • Auxin
  • Antigibberellin
Gibberellins bring about
  • Yellowing of leaves
  • Promotion of rooting
  • Elongation of genetically dwarf plants
  • Dwarfing of genetically tall plants
Gibberellic acid induces flowering in
  • Some plants only
  • Long day plants under short day conditions
  • Short day plants under long day conditions
  • Day neutral plants
Highest auxin concentration occurs
  • In growing tips
  • In leaves
  • At base of plant organs
  • In xylem and phloem
Cut pr excised leaves remain green for long if induced to root or dipped in
  • Gibberellins
  • Cytokinins
  • Auxins
  • Ethylene
What is a stress hormone? or The hormone produced during adverse environmental conditions is
  • Benzyl aminopurine
  • Dichlorophenoxy acetic acid
  • Ethylene
  • Abscisic acid
The regulator which retards ageing senescence of plant parts is
  • Cytokinin
  • Auxin
  • Gibberellin
  • Abscisic acid
Cytokinins are mostly
  • Glucosides
  • Aminopurines
  • Acidic
  • Phenolic
Gibberellin application to a plant brings about 
  • Leaf fall
  • Diversification of root system
  • Elongation of shoot system
  • Delay in senescence
Which one induces flowering in short-day plants?
  • Auxin
  • Cytokinin
  • Gibberellin
  • Propylene
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