CBSE Questions for Class 11 Medical Biology Plant Growth And Development Quiz 6 - MCQExams.com

A plant hormone which delays senescence and helps in cell division is .............
  • Auxin
  • Gybberellin
  • Cytokinin
  • Abscissic acid
Which of the following is incorrectly matched?
  • Explant - Excised plant part used for callus formation
  • Cytokins - Root initiation in callus
  • Somatic embryo - Embryo produced from a vegetative cell
  • Anther culture - haploid plants
  • Callus - Undifferentiated mass of cells
Zn is useful in auxin synthesis as it causes formation of  .............
  • Tryptophan
  • Methionine
  • IAA oxidine
  • $${NADH_2}$$
Which two of the following are growth promoting hormones in plant?
  • Auxin and Cytokinin
  • Gibberellin and Ethylene
  • Abscisic acid and Auxin
  • Cytokinin and Ethylene
............ promotes bolting.
  • Auxin
  • Cytokinin
  • Gibberellins
  • None of the above
Choose the wrongly matched pair from the following.
  • Auxins - to grow
  • Gibberellins - Gibberella fujikuroi
  • Cytokinins - herring sperm DNA
  • Abscissic acid - flowering hormone
One of the commonly used plant growth hormone in tea plantation is ...................
  • Ethylene
  • Abscisic acid
  • Zeatin
  • Indole-3-acetic acid and indole butyric acid
The major natural auxins is .........
  • IBA
  • $$2,4D$$
  • IAA
  • NAA
The ripening fruits soften due to 
  • Conversion of starch into sugars.
  • Solubilisation of pectates in middle lamella.
  • Formation of organic acids.
  • Conversion of fats into carbohydrates.
If a mature differentiated cell develops into an embryo, the phenomenon
is ..........................
  • Morphogenesis
  • Maturation
  • Differentiation
  • Dedifferentiation
Which plant shows distinct development from juvenile to adult phase?
  • Triticum vulgare
  • Hedera Helix
  • Solanum tuberosum
  • Petunia
Root development is promoted by
  • Abscisic acid
  • Auxin
  • Ethylene
  • Gibberellin
Which one of the following pairs is not correctly matched?
  • Adenine derivative - kinetin
  • Carotenoid derivative - ABA
  • Terpenes - IAA
  • Indole compounds - IBA
  • Gas - Ethylene
Which of the following is not properly matched?
  • Explant - excised plant part used for callus formation
  • Cytokinins - root initiation in callus
  • Somatic embryo - embryo produced from a vegetative cell
  • Anther culture - haploid plants
  • Callus - undifferentiated mass of cells
Avena coleoptile test to find out the quantity of growth promoting hormones was discovered by
  • L. J. Oudus
  • F. W.  Went
  • K. V. Thimann
  • F. Skoog
Auxin inhibits the growth of
  • Apical bud
  • Lateral axillary buds
  • Roots on stem cutting
  • Parthenocarpic development of fruits
Cellular totipotency is demonstrated by
  • Only gymnosperm cells
  • All plant cells
  • All eukaryotic cells
  • Only bacterial cells
The biological activity of IAA is tested by
  • $$\alpha$$-amylase test
  • Avena curvature test
  • Soyabean callus test
  • Xanthium leaf disc test
Indole acetic acid, called as auxin was first isolated from
  • Human urine
  • Corn germ oil
  • Fusarium
  • Rhizopus
After stem cutting, induction of rooting by auxin treatment would be beneficial in which of the following?
  • Marchantia
  • Wheat
  • Cuscuta
  • Bougainvillea
Which of the following effects of auxin is of wide application?
  • Induction of fruit development
  • Induction of root initiation
  • Prevention of abscission
  • All of the above
Leaf fall occurs when the amount of 
  • Auxin increases
  • Auxin decreases
  • Abscisic acid decreases
  • Gibberellic acid decreases
Substances which originate at the tip of stem to promote growth are called as
  • Vitamins
  • Enzymes
  • Food materials
  • Auxins
Primary precursor of IAA is
  • Phenyl alanine
  • Tyrosine
  • Tryptophan
  • Leucin
Fruit drop is caused by 
  • Less auxin in fruit than in stem.
  • More auxin in fruit than in stem.
  • Equal distribution of auxin in stem and fruit.
  • Absence of auxin in stem and fruit.
Auxin is mainly produced by
  • Apical root meristem
  • Root cambium
  • Apical shoot meristem
  • Phloem in shoot tip
Indole acetic acid is a .............................
  • Only acetic acid
  • Carboxylic acid in which carboxyl group is attached
  • Both A and B
  • None of the above
Native auxin (endogenous) is transported in the plant 
  • From the shoot tip in the downward direction
  • From the root tip in the upward direction
  • Through vascular systems in plants
  • By a special transport system in the root
Growth hormone acts 
  • Always as growth promoters
  • Always are growth inhibitors
  • Some as promoters and some as inhibitors
  • Rarely as growth inducers
Which one of the following hormone is concerned chiefly with root initiation?
  • IAA
  • GA$$_{3}$$
  • ABA
  • Gibberellins
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 cell on the lighted side to grow faster.
  • Auxin accumulates on the shaded side.
Auxanometer is meant for measuring
  • Respiratory activity
  • Photosynthesis activity
  • Growth activity
  • Osmotic pressure
In a growing plant, the first phase during the process of growth is 
  • Cell division
  • Cell enlargement
  • Cell differentiation
  • Cell maturation
The movement of auxin is largely
  • Acropetal
  • Basipetal
  • Lateral
  • Centripetal
2, 4-D is a synthetic
  • Auxin
  • Gibberellin
  • Cytokinin
  • Florigen
Cytokinin 
  • Is a hormone whose main function is to induce the cell division.
  • Is the process of cell division.
  • Refers to cell division.
  • Causes dormancy.
Which of the following is a weed killer?
  • 2, 4-D
  • NAA
  • GA
  • ABA
Premature fall of fruit can be stopped by 
  • Auxin
  • GA$$_{3}$$
  • ABA
  • None of the above
Which of the following induces femaleness in plants?
  • Auxin and ethylene
  • Ethanol
  • ABA
  • Gibberellin
Which of the following auxins are widely used as herbicides?
  • 2, 4-D and 2, 4, 5-T
  • 2, 4-D and cytokinin
  • 2, 4-D and 2, 4-T
  • 2, 4, 5-T and GA
The compounds that inhibit the action of auxin are known as
  • Antiauxins
  • Auxins promoters
  • Auxin precursors
  • Both (A) and (B)
Which of the following prevents the fall of fruits?
  • GA$$_{3}$$
  • NAA
  • Ethylene
  • Zeatin
Which of the following is not an enzyme?
  • Oxidase
  • Pepsin
  • Auxin
  • Trypsin
Richmond Lang effect is due to .........................
  • Cytokinin
  • Auxin
  • ABA
  • All of the above
Supra optima (more than 10 ppm) concentration of auxin
  • Promotes flowering
  • Kill the plant
  • Prevent shortening of the internodes
  • Promotes growth in both, stem and roots apex
Gibberellin stimulates flowering in
  • The plants growing in Japanese farms
  • The short day plants
  • The long day plants
  • Day neutral plants
Gibberellin was first extracted from 
  • Fusarium 
  • Gellidium
  • Gracillaria
  • Aspergillus
Which of the following plant hormone substitutes for long photoperiod in flowering plants?
  • Auxin
  • Gibberellins
  • Cytokinin
  • Ethylene
The plant hormone, which is synthesized in root and translocated to aerial 
parts is 
  • Auxin
  • Cytokinin
  • Traumatin
  • Morphactin
Hormone involved in photoperiodism is
  • IAA
  • Gibberellin
  • Kinetin
  • 2, 4-D
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