MCQ
The gas absorbed during photosynthesis is
- AOxygen
- BNitrogen
- CAmmonia
- ✓Carbon dioxide
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$Y$ - Metabolic reactions can be demonstrated outside the body in cell free system
$R$ : Bark is formed due to the activity of phellogen only.
$I.$ Primary and secondary phloem gets crushed during secondary growth
$II.$ During secondary growth, primary xylem remains more or less intact