SECTION A Question 1 Alultiple Cingiae 1.1 The control centre of a living cell is the - A chromosome. B cell membrane. C cytoplasm. D nucleus. 1.2 Viruses... A occur only in water. B are living organlsms. C are pathogenic. D can cause foods to decay. 1.3 Viruses are said to be living because. A they can respire. B they can regroduce on their own.

Sure, let's go through each of the multiple-choice questions you've provided: --- ### **Section A** #### **Question 1: Multiple Choice** --- **1.1 The control centre of a living cell is the:** **A.** Chromosome **B.** Cell membrane **C.** Cytoplasm **D.** Nucleus **Answer:** **D. Nucleus** **Explanation:** The nucleus serves as the control center of a cell. It houses the cell's genetic material (DNA) and coordinates activities like growth, metabolism, and protein synthesis by regulating gene expression. --- **1.2 Viruses...** **A.** Occur only in water **B.** Are living organisms **C.** Are pathogenic **D.** Can cause foods to decay **Answer:** **C. Are pathogenic** **Explanation:** Viruses are considered pathogenic because they can cause diseases in various organisms, including humans, animals, and plants. They are not classified as living organisms since they cannot carry out metabolic processes or reproduce independently; they require a host cell to replicate. --- **1.3 Viruses are said to be living because:** **A.** They can respire **B.** They can reproduce on their own **Answer:** **None of the above options are entirely correct.** **Explanation:** Typically, viruses are **not** considered living organisms because: - **They cannot respire:** Viruses do not carry out metabolic processes like respiration. - **They cannot reproduce on their own:** Viruses require a host cell's machinery to replicate. However, some scientists debate this classification, considering factors like their ability to evolve and adapt. But based on the options provided, neither A nor B accurately describes why viruses might be considered living. --- If you have more questions or need further clarification on these topics, feel free to ask!