Q. Which of the following are biodegradable polymers?

1. Polylactic acid (PLA)
2. Polyhydroxybutyrate (PHB)
3. Polyvinyl chloride (PVC)
4. Polystyrene

Select the correct option from the codes given below:
Answer: Only 1 and 2
Notes: Polylactic acid (PLA) and Polyhydroxybutyrate (PHB) are biodegradable, derived from renewable resources and decompose by microbial action. Polyvinyl chloride (PVC) and Polystyrene are synthetic polymers that are non-biodegradable and persist in the environment. Thus, only options 1 and 2 are biodegradable polymers.