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Hey please answer this encircled parto

Hey please answer this encircled parto known that not only the duration of light period but that the duration of dark period is also ofequal importance. Hence, it can be said that flowering in certain plants depends not only on a combination Of light and dark exposures but also their relative durations. m•is response of periods of day [night is termed photoperi t is also interesting to note that while shoot apices modify themselves into flowering apices prior to flowering. they (i.e. , shoot apices of plants) by themselves cannot percieæ photoperiods. The site of perception of light d the I o It has been hypothesised that there is hormonal substance s that is responsible for flowering. This hormonal substance migra m leaves to shoot apices for inducing flowering only When the are exposed to the necessary inductive photoperiod. 15.6 VERNALISATION

Dear student Please find below the solution of your asked query..... "The site of perception of light/dark duration are the leaves. It has been hypothesised that there is a hormonal substance(s) that is responsible for flowering". Here hormonal substances refers to different hormones which are released and responsible for flowering they are 1) Ethylene is used to initiate flowering and for synchronising fruit-set that induces flowering. 2) Florigen (or flowering hormone) is the hormone-like molecule responsible for controlling and triggering flowering which is produced in the leaves, and acts in the shoot apical meristem of buds and growing tips. Hence the term used as hormonal substance(s ). ........ Hope the above mentioned explanation clears your doubts about the topic keep asking Regards

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There is a substace in the leaves which acts like hormone during flowering. Like the Growth Hormone in human causes growth of the body just like that this hormonal subtance present in leaves causes flowering.
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