Which of the following statements is not correct?

  1. PGR is of only one kind of intrinsic control
  2. Only under genomic control, these PGRs play an important role in plant growth and development
  3. Many of the extrinsic factors such as temperature and light control plant growth and development via PGR
  4. Vernalization, Flowering, dormancy, seed germination and plant movements are under the control of extrinsic factors along with intrinsic factors
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For the induction of flowering, some plants require a

  1. Periodic exposure to light
  2. Continuous exposure to light
  3. No exposure to light
  4. No exposure to night
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If a plant needs exposure of light more than a defined period for flowering, such plant is called

  1. Long day plants
  2. Short day plants
  3. Day neutral plants
  4. Red light plants
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If a plant needs exposure of light less than a defined period for flowering, such plant is called

  1. Long day plants
  2. Short day plants
  3. Day neutral plants
  4. Far red light plants
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When there is no such relation between exposure to light duration and induction of flowering response such plants are called

  1. Long day plants
  2. Short day plants
  3. Day neutral plants
  4. Far red light plants
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Which of the following is not true for flowering?

  1. Only duration of dark period is important
  2. Certain plants depend not only on a combination of light and dark exposures but also their relative durations
  3. The site of perception for light or dark duration are the leaves
  4. There is a hormonal substance which migrates from leaves to shoot apices for inducing flowering only when the plants are exposed to the necessary inductive photoperiod.
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Flowering can be affected in certain plants

  1. by quantitative exposure to low temperature
  2. by qualitative exposure to low temperature
  3. Both A and B
  4. It does not depend on low temperature exposure
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Vernalisation prevents

  1. Precocious reproductive development late in growing season
  2. Late reproductive development
  3. Flowering
  4. Fruiting
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Vernalisation

  1. Disables the plant to have fruits
  2. Enables the plants to have fruits
  3. Enables the plants to have sufficient time to reach maturity
  4. Brings senescence
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Vernalisation refers to

  1. The promotion of flowering by a period of high temperature
  2. The inhibition of flowering by a period of low temperature
  3. The promotion of flowering by a period of low temperature
  4. The inhibition of flowering by a period of high temperature
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