MCQ
Stratification occurs in
- ADesert
- ✓Tropical forest
- CDeciduous forest
- DTundra
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$Statement 2$: Certain contraceptives are planted under the skin of the upper arm to prevent pregnancy
$I.$ This method is also known as biolistic technique
$II. $ In this method cells are bombarded with high velocity micro-particles of gold or tungsten coated with $DNA$ in plants
$III.$ Important crop plants like maize, rice and wheat have now been transformed by this method
Which of the statements given above are correct?