Sulphur dioxide causes corrosion by forming sulphuric acid in presence of moisture, damaging iron and steel structures over time. It accelerates rusting and weakens metal integrity, especially in polluted industrial environments.

Smooth ER synthesizes lipids such as phospholipids and steroids. It also helps in detoxification. Protein synthesis occurs in rough ER, not smooth ER.

The Uch Gas Field is located in Balochistan, Pakistan, and is an important source of natural gas for the country. It was discovered in the mid-20th century and has been developed primarily to supply fuel for power generation. Natural gas from Uch is used in thermal power plants, helping to generate electricity and support industrial activities. This contributes significantly to Pakistan’s energy sector and reduces reliance on imported fuels. Balochistan is rich in natural resources, including gas, coal, and minerals. Other provinces like Sindh also have major gas fields, such as Qadirpur, but Uch specifically belongs to Balochistan. Khyber Pakhtunkhwa and Punjab are not known for the Uch gas field. Therefore, Balochistan is the correct answer. Knowledge of such resources is important for understanding national energy infrastructure and economic geography.

Parthenocarpy is the development of fruit without fertilization, resulting in seedless fruits. This phenomenon can occur naturally or be induced artificially using plant hormones. Common examples include bananas and seedless grapes. These fruits are commercially valuable because they are easier to eat and often preferred by consumers. In normal fruit development, fertilization triggers seed formation. In parthenocarpy, this step is bypassed, but fruit growth still occurs. Other options are incorrect because parthenocarpy specifically refers to seedless fruit production. Thus, seedless fruit is the correct answer. This concept is important in botany and agriculture, especially in improving crop quality and market value.

The 1935 earthquake struck Quetta, now the capital of Balochistan, Pakistan. It occurred on May 31, 1935, with an estimated magnitude of around 7.7, making it one of the most destructive earthquakes in the region’s history. The earthquake caused massive destruction because most buildings were made of mud and were not designed to withstand seismic activity. It is estimated that between 30,000 and 60,000 people lost their lives. The disaster occurred early in the morning, which increased casualties as people were indoors. Quetta lies in a seismically active zone due to the collision of the Indian and Eurasian tectonic plates. This makes the region highly prone to earthquakes. The 1935 event highlighted the need for earthquake-resistant construction and better disaster preparedness. Other cities like Karachi, Lahore, and Jhelum have not experienced such catastrophic earthquakes historically. Therefore, Quetta is the correct answer. This event remains a key example in studies of seismic hazards and urban vulnerability in South Asia.