According to pressure flow theory which one of the following act both as source and sink?
پریشر فلو تھیوری کے مطابق مندرجہ ذیل میں سے کون سا ماخذ اور ڈوب کے طور پر عمل کرتا ہے؟
- Leaves
- Fruits
- Roots
- None of these
Explanation
According to the pressure flow theory, roots can act as a sink (when storing food) and as a source (when mobilizing stored food).
This dual role depends on the plant’s growth stage and seasonal needs.
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قدیم تہذیبوں اور معاشروں کا مطالعہ کیا کہلاتا ہے؟
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