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Physiology of flowering (Photoperiodism and Vernalization) - Basic

Dear Readers,

Physiology of flowering It involves two steps. 1. Events in the bud leading to flowering: a. Induction: -flowering stimulus is generated. -Influenced by water stress, chilling temperature or photoperiod.

Q1.  The pigment involved in red-far red light interconversion is

  •  Cytochrome
  •  Xanthophyll
  •  Lycopen
  •  Phytochrome

Phytochrome

Q2.  Which one of the following statements is true for the phytochrome

  •  Phytochrome is a phytohormone
  •  Phytochrome is a photosynthetic pigment
  •  Phytochrome is a pigment that controls growth, photomorphogenesis and development of many plants
  •  Phytochrome is a regulatory protein that controls several dark-dependent developmental processes

Phytochrome is a pigment that controls growth, photomorphogenesis and development of many plants

Q3.  In many plants the change over from vegetative to reproductive phase takes place in response to

  •  The length of the day
  •  The severity of temperature
  •  Mainly the food material available in soil
  •  Oxygen present in the air

The length of the day

Q4.  When the dark period of short day plants is interrupted by a brief exposure of light, then the plant

  •   Will not flower at all
  •   Flower immediately
  •  Give more flowers
  •  Turn into a long day plant

Will not flower at all

Q5. Which one of the following is an excellent example of physiological preconditioning

  •  Photosynthesis
  •  Respiration
  •  Photoperiodism
  •  Vernalization

Photoperiodism

Q6. The term "photoperiodism" was proposed by or The phenomenon of photoperiodism in plants was discovered by

  •  Lysenko and Thimann
  •   Blackmann and Skoog
  •   Garner and Allard
  •  Chailakhyan and Borthwick

Garner and Allard

Q7.  Skototropic movements are induced by

  •  Night
  •   Light
  •  Touch
  •  Heat

Night

Q8.  Prolongation of continuous darkness will initiate

  •  Early flowering in short day plants
  •   Delay flowering in short day plants
  •   Flowering will not be effected
  •   None of these

Early flowering in short day plants

Q9. Most of the plants are seasonal due to

  •  Photoperiodism
  •  Phototropism
  •  Photosynthesi
  •   Photolysis

Photoperiodism

Q10.  Which of the following is not short-day plant

  •   Saccharum officinarum
  •   Solanum tuberosum
  •   Glycine max
  •   Brassica compestris

Solanum tuberosum



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