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# 1
pilihan
The major greenhouse gas released from landfills is:
- Oxygen
- Carbon monoxide
- Hydrogen
- Methane
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Universiti
Sains
138
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# 2
pilihan
Upcycling refers to:
- Enhancing the purpose of the existing materials.
- Converting waste into new, usable materials.
- Using items more than once before discarding them.
- Adding value without destroying the original material.
# 3
pilihan
Which of the following is not a biotechnology-based recycling method?
- Phytoremediation of heavy metals from soil using sunflower plants
- Enzyme-based depolymerization of plastic bottles
- Composting leaves and food waste with microbial inoculants
- Gasification of plant biomass into syngas using high-temperature reactors
# 4
pilihan
What is the main goal of a circular bioeconomy?
- Promote 3R (Reduce, Reuse and Recycle)-based activities
- Promote economic activities that do not cause pollutions
- Balance the profits from an economic activity.
- Promote the use of renewable biological resources by keeping materials in use for as long as possible.
# 5
pilihan
Which of the following is NOT a key requirement in biotechnology-based recycling of waste materials?
- To characterise the waste materials
- To screen potential organisms
- To optimise the biodegradation process
- To eliminate all by-products resulting from the degradation
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