The correct option is **B**: Biopolymers are typically biodegradable and derived from natural sources, whereas synthetic polymers are usually non-biodegradable and made from petrochemicals. ### Detailed Explanation 1. **Understanding Biopolymers**: - **Definition**: Biopolymers are large molecules made up of repeating units (monomers) that are produced by living organisms. Common examples include proteins, nucleic acids (like DNA and RNA), and polysaccharides (like cellulose and starch). - **Source**: They are derived from natural sources, such as plants, animals, and microorganisms. For instance, cellulose is derived from plant cell walls, while proteins are made from amino acids in living organisms. 2. **Understanding Synthetic Polymers**: - **Definition**: Synthetic polymers are man-made polymers created through chemical processes. They are typically formed from petrochemicals, which are derived from fossil fuels. - **Examples**: Common synthetic polymers include polyethylene (used in plastic bags), polystyrene (used in foam products), and nylon (used in textiles). 3. **Biodegradability**: - **Biopolymers**: One of the key characteristics of biopolymers is their biodegradability. This means that they can be broken down by microorganisms into natural substances like water, carbon dioxide, and biomass. This property makes them environmentally friendly, as they do not accumulate in landfills or oceans. - **Synthetic Polymers**: In contrast, many synthetic polymers are non-biodegradable, meaning they do not decompose easily in the environment. This leads to significant environmental issues, such as plastic pollution. 4. **Why Option B is Correct**: - The statement accurately captures the essence of biopolymers and synthetic polymers. It highlights the natural origin and biodegradability of biopolymers, contrasting it with the synthetic nature and non-biodegradability of synthetic polymers. This distinction is crucial in discussions about environmental impact and sustainability. ### Why the Other Options are Incorrect - **Option A**: "Biopolymers are always produced through chemical synthesis, while synthetic polymers are formed through natural processes." - **Incorrect Reasoning**: This statement is fundamentally flawed. Biopolymers are produced by biological processes (e.g., through metabolic pathways in living organisms), not chemical synthesis. Conversely, synthetic polymers are created through chemical synthesis, not natural processes. - **Option C**: "Synthetic polymers have a higher molecular weight than biopolymers, making them more durable." - **Incorrect Reasoning**: While some synthetic polymers can have high molecular weights, this is not a universal truth. Biopolymers can also have high molecular weights (e.g., proteins can be very large). Durability is not solely determined by molecular weight; it also depends on the polymer's structure and the conditions it is exposed to. - **Option D**: "Biopolymers are less versatile in applications compared to synthetic polymers, which can be tailored to specific needs." - **Incorrect Reasoning**: This statement underestimates the versatility of biopolymers. While synthetic polymers can be engineered for specific applications, biopolymers also have a wide range of applications, including in medicine (e.g., drug delivery systems), food packaging, and biodegradable materials. The versatility of biopolymers is growing as research advances. ### Revision Summary - **Biopolymers**: Derived from natural sources, biodegradable, and produced by living organisms. - **Synthetic Polymers**: Man-made, typically non-biodegradable, and derived from petrochemicals. - **Environmental Impact**: Biopolymers are generally more environmentally friendly due to their biodegradability. - **Versatility**: Both biopolymers and synthetic polymers have diverse applications, but biopolymers are increasingly being recognized for their potential in sustainable solutions.