All given statements are correct with respect to photoperiodism,except:

  • A
    Discovered by Garner and Allard in a variety of tobacco
  • B
    Stimulus is received by young leaves
  • C
    Florigen is the hypothetical hormone produced in response to stimulus
  • D
    Florigen is transported to bud through phloem

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Phytochrome is found in

The site of perception of light in plants during photoperiodism is:

For the germination of seed,which light is necessary?

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The relation of flowering to the lengths of light and dark periods was investigated by two experiments. In one experiment,the plants were subjected to dark periods of various lengths while the light periods were kept at $4$ hours. In the second experiment,plants were kept in dark periods of various lengths while the light periods were kept at $16$ hours. The number of flowers formed in relation to these periods is shown in the table. These results indicate that flowering:
Dark periods (hours) Flowers formed (Light: $4$ hrs / $16$ hrs)
$8$ $0$ / $0$
$10$ $0$ / $0$
$12$ $4$ / $6$
$14$ $5$ / $7$
$16$ $5$ / $8$

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