MCQ
In the cell cycle, maternal and paternal chromosomes exchange their substances, this phenomenon is called:
- ADouble conjunction formation
- BPair formation
- CSynapsis
- ✓Crossing over
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$I.$ Cytokinins suppress the synthesis of chlorophyll.
$II.$ Auxins control apical dominance.
$III.$ Gibberellins promote shoot elongation.
$IV.$ Abscisic acid enabling seeds to withstand desiccation.
Which of the above statements are correct