S.5 Eoy Biology 1

The BIOLOGY DEPARTMENT IGANGA TOP CARE SECONDARY SCHOOL 2025 1 IGANGA TOP CARE SECONDARY SCHOOL Uganda Advanced Certificate of Education End Of Year Assessment 2025 S.5 BIOLOGY THEORY PAPER P530/1 TIME: 2 ½ HOURS INSTRUCTIONS: This paper consists of two sections A and B. Section A is compulsory . Respond to two (2) items only from section B. All items carry equal marks. SECTION A This section is compulsory ITEM 1 Mwesigwa works in a gold mining factory that produces toxic chemicals like cyanide that affect cellular respiration. Previously, he used to work tirelessly all day long before joining the factory. Currently, he feels fatigue, chest pain and slowed heart rate and t otally inefficient. He went to the hospital for medical checkup, then later advised to start engaging in physical exercise. The table below shows parameters in Mwesigwa’s body. Parameter in Mwesigwa’s body Oxygen consumption (𝝁mol/min) ATP production (𝝁mol/min) Lactate production (𝝁mol/min) Before working in the factory 10 30 2 Currently while working in the factory 2 5 15 During exercise 25 60 10 Task (a) Explain the observed changes in the parameters during the following conditions. (i) While working in the factory. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. The BIOLOGY DEPARTMENT IGANGA TOP CARE SECONDARY SCHOOL 2025 2 …………………………………………………………………………………………………….. (ii) During exercise. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. (b) Suggest measures that Mwesigwa should perform so as to improve on his general body health. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. ITEM 2 Many fish farmers of Kasese district obtain fish feeds mainly algae from neighbouring in -land water bodies. However, through the Department of Zoology, Entomology and Fisheries at Makerere University , studies on the population of single -celled algae in L. Katwe ecosystem have been conducted. Recently, they've observed a significant decline in the algae population. Initial …