Objective for photoperiodism

Multiple Choice Questions (MCQs)

1. Experiments on hemp were performed by:

(a) Garner                   (b) hi ien          (c) Kleb            (d) Hamner

2. Experiment on house leek plants were performed by:

(a) Garner                   (b) Julien          (c) Kleb            (d) Hamner

3. Biloxi soybean flowers in:

(a) January                  (b) June           (c) October      (d) December

4. Maryland Mammoth is:

(a) Soya bean             (b) Wheat         (c) Tobacco      (d) rice

5. Which of the followings is not sbort day plant?(a) Cotton                      (h) Cocklebur (c) Xanthium (d) ‘Tobacco
   6. Which of the followings is day neutral plant?

   (a) Cotton                      (b) Cocklebur ( c ) Xanthium (d) Tobacco

   7. Which of the followings long day plant?

   (a) Cotton                      (b) tomato        (c y X anthi UM (d) cabbage

   8. The critical time period for santhium is less than hours:

   (a) 12                           (h) 14             (c) 16                (d) 15

   9. The critical  time period for Hyoscyamus is less than:

   (a) 12                           (b) 14              (c) 10                (d) 15

   1. Borthwick and Hendricks discovered:

   (a) Photoperiodism         (d) Ph_ytochrome(c) dormancy (d) None

   1. Chailakhyan named:

   (a) Photoperiodism         (d ) Phytochrome(c) dormancy (d) florigen
   Answers

   
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   I. (h) 2. (c) 3. (e) 4. (c)             5. (a) 6. (a) 7. (d) 8. (d) 9. (c)
   10. (d)

   Fill in blanks

   1.  The response of plant to the relative length of light and _____________  period is called photoperiodism.
6. 2. The photoperiod of 12 hours acts as a __________________ day for Hyoscyamus.
   3. The proteins present in the leaves which absorb light of different wave lengths are called ___.
   4. Siegelman and_____________  in 1964 extracted and purified phytochrome from etiolated maize leaf.
   5. The short day plants produce flowers in the presence of_____________  .
   6. Long day plants produces limiter in the presence of_____________  .
   7. Chailakhyan suggested that two factors are involved in the flowering stimulus. First factor is_____________ and the second factor is_____________  .

   Ans

   I. dark               2. long             3. phytochromes         4.Firir

   5. Pr                  6. Pfr             7. gibberellins.

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• Subjective and Short questions for photoperiodism
• Phytochromes – Discovery , Types & Mechanism
• DEFINITIONS AND KEY POINTS FOR Photoperiodism
• ROLE OF HORMONES IN PHOTOPERIODISM ROLE OF FLORIGEN