$A$: Soyabean and sugarbeet flower when they are exposed to a photoperiod shorter than the critical period.
$R$: Most winter-flowering plants are $LDP$.

  • A
    Assertion and Reason both are correct and Reason is the correct explanation of Assertion.
  • B
    Assertion and Reason both are correct but Reason is not the correct explanation of Assertion.
  • C
    Assertion is correct,but Reason is incorrect.
  • D
    Both Assertion and Reason are incorrect.

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If a tree flowers three times a year (in $October$, $January$, and $July$) in North India, what can be said about it?

What is the site of perception of photoperiod necessary for the induction of flowering in plants?

Which of the following statements are $INCORRECT$ with respect to phytochrome?
$i$. Phytochrome is a light-receiving proteinaceous pigment present in the leaves of plants.
$ii$. Phytochrome pigment exists in two forms.
$iii$. Two forms of phytochromes are interconvertible.
$iv$. Phytochromes are located in the chloroplast of green cells.
$v$. Phytochrome $P_r$ form inhibits flowering in $LDP$ during the dark period.

$A$ hypothetical 'florigen' could be produced prematurely in a long-day plant by exposing it to:

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Which of the following pigments absorbs red and far-red light?

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