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$(I)$ Chromosome cluster at opposite spindle poles.
$(II)$ Nuclear envelope assembles around the chromosome clusters.
$(III)$ Golgi complex and $ER$ reform.
Assertion $A$ : Late wood has fewer xylary elements with narrow vessels.
Reason $R$ : Cambium is less active in winters.
In the light of the above statements, choose the correct answer from the options given below :
$I.$ Polymerase Chain Reaction $(PCR)$ is a technique of synthesizing multiple copies of the desired gene in vitro
$II.$ This technique was developed by Kary Mullis in $1985$
$III.$ A single $PCR$ amplification cycle involves three basic steps; denaturation, annealing and extension
Which of the statement given above are correct?
$I.$ Cytokinins are formed primarily in roots
$II.$ Auxin and cytokinin are antagonistic in apical dominance
$III.$ Kinetin (a modified $DNA$ purine) was discovered from herring sperm
$IV.$ Zeatin is auxin
$V.$ Zeatin was firstly extracted from herring
Choose the incorrect one