A farmer, Deepa, was very happy with the harvest of amla (Indian Gooseberry) and lemons on her farm. However, she could sell only one-fourth of the produce in the local market. Recognising that a significant amount of produce may be lost post-harvest, she employed a traditional yet scientifically sound method to extend the shelf life of amla and lemons. She turned perishable produce into profitable products, such as pickles and sharbat. She used the excess produce to prepare pickles, murabbas, and sharbat by adding appropriate amounts of salt, sugar, or jaggery to small pieces of fruit and their juices. These were then stored in small glass bottles for sale, helping her prevent the wastage of post-harvest produce. This shift from farming to agro-processing would strengthen food security and boost the local economy, creating a sustainable model that cuts waste while increasing her income. Based on the above passage answer the following questions:

(i) Which scientific concept has the farmer applied in the preservation of the farm produce?

(ii) How does the addition of high concentrations of salt and sugar create an environment that prevents the growth of spoilage-causing bacteria and fungi?

(iii) Suggest a healthy recipe of this kind for food preservation.

(iv) What are the scientific values addressed in this case?

(i) The farmer has applied the scientific concept of osmosis in the preservation of her farm produce. By adding high concentrations of salt and sugar, she creates a concentrated (hypertonic) environment that preserves the food.

(ii) When high concentrations of salt and sugar are added, the surroundings of the spoilage-causing bacteria and fungi become hypertonic (more concentrated than the inside of the microbial cells). By osmosis, water moves out of the microbial cells, from their higher water concentration inside to the lower water concentration outside. This loss of water dehydrates the microbes and prevents them from growing and multiplying, thereby stopping spoilage of the food.

(iii) A healthy recipe of this kind: Amla murabba prepared with jaggery. Clean and prick fresh amla pieces, boil them briefly to soften, and then cook them in a concentrated jaggery syrup. The concentrated syrup draws water out of spoilage-causing microbes by osmosis and helps preserve the amla. The murabba can be stored in clean glass jars. Other examples include lemon pickle with salt or sun-dried salted vegetables.

(iv) The scientific values addressed in this case include:

• Application of scientific knowledge (osmosis) to solve a real-life problem.
• Reduction of food wastage and promotion of sustainability.
• Strengthening of food security.
• Resourcefulness, innovation and entrepreneurship.
• Respect for and use of traditional knowledge in a scientifically sound way.
• Contribution to the local economy and self-reliance.