Greenhouse walls (also known as glazing) are primarily made of glass, polycarbonate panels, or polyethylene plastic film. These materials are chosen to allow maximum sunlight to enter while trapping heat and protecting plants from outdoor elements.
Greenhouse walls are usually made of?
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Question context
This question is part of 🌍 Current Affairs within the broader 🌐 Current Affairs & GK subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.