151. Bacteria used to extract copper, uranium and gold from low-grade ores is an example of:
Answer: B. mineral processing
Biology Class 11 Unit 6: Prokaryotes MCQs
227 multiple choice questions with the correct answer for each. Tap an option to check yourself, or switch on "Show all answers". This is page 4 of 5.
Tap an option to check your answer.
152. The main symptom of cholera is:
Answer: C. profuse watery diarrhoea
153. The causative agent of cholera is:
Answer: B. Vibrio cholerae
154. The primary treatment of cholera is:
Answer: B. replacement of fluids and electrolytes
155. Cholera is mainly prevented by:
Answer: B. clean water supply and public health measures
156. The causative agent of typhoid is:
Answer: B. Salmonella typhi
157. A characteristic symptom of typhoid is:
Answer: C. high fever and rose coloured spots on abdomen
158. Typhoid is prevented by:
Answer: B. hand washing, pasteurization of milk, proper cooking and vaccines
159. The causative agent of tuberculosis is:
Answer: C. Mycobacterium tuberculosis
160. Symptoms of secondary TB include:
Answer: C. evening fever, night sweats, weight loss and bloodstained sputum
161. DOTS stands for:
Answer: B. Directly Observed Treatment Short course
162. The vaccine for TB, BCG, contains live:
Answer: B. Mycobacterium bovis
163. BCG stands for:
Answer: B. Bacillus Calmette-Guerin
164. Multiple drug therapy is used in TB to prevent emergence of:
Answer: B. drug resistant mutants
165. Pneumonia begins with sudden chills, cough and:
Answer: B. pleuritic pain, with rusty coloured sputum
166. The causative agent of pneumonia is:
Answer: C. Streptococcus pneumoniae
167. Pneumococci are susceptible to:
Answer: B. penicillin and erythromycin
168. Important bacterial plant diseases include:
Answer: B. leaf spots, blights, soft rots, wilts and galls
169. Ring disease of potato is caused by:
Answer: C. Aplanobacter sepedonicum
170. Soft rot of potato is caused by:
Answer: B. Erwinia atroseptica
171. In soft rot, the necrotized tissue becomes:
Answer: B. wet to touch and soft
172. Pseudomonas solanacearum causes:
Answer: C. wilt disease of potato
173. In wilt diseases the plant loses turgidity because of interference with:
Answer: B. upward transport of water through the stem
174. Crown gall in plants is caused by:
Answer: B. Agrobacterium tumefaciens
175. Olive knot is caused by:
Answer: C. Pseudomonas savastanoi
176. Root nodules of legumes are galls produced by:
Answer: B. Rhizobium leguminosarum
177. Blight symptoms appear rapidly because:
Answer: B. necrosis damages plant cell structure quickly and may kill the whole plant
178. Normal flora refers to:
Answer: B. bacteria permanently resident in certain body parts
179. In the human body, bacterial cells outnumber human cells by about:
Answer: C. ten times
180. Normal flora is found especially in the:
Answer: A. skin, oropharynx, colon and vagina
181. Lactobacillus is found in the:
Answer: B. mouth, colon and vagina
182. Staphylococcus aureus is normally found in the:
Answer: C. nose and skin
183. Lactobacilli in the vagina keep it:
Answer: B. acidic, preventing overgrowth of harmful bacteria and yeast
184. The short-chain fatty acid made by gut bacteria is:
Answer: B. butyrate
185. The gut bacteria produce vitamins:
Answer: C. B vitamins and K
186. Competitive exclusion by normal flora means:
Answer: B. they prevent harmful bacteria from colonizing the gut
187. Chemicals used to kill bacteria on inanimate surfaces are:
Answer: B. disinfectants
188. Chemicals used on living tissue to prevent infection are:
Answer: B. antiseptics
189. Bleach is chemically:
Answer: B. sodium hypochlorite
190. Sodium benzoate and potassium sorbate are:
Answer: C. preservatives
191. Chlorine is used in water treatment to:
Answer: B. disinfect drinking water
192. Sulfonamides and nitrofurans are used in:
Answer: B. chemotherapy
193. The process of killing all life forms is:
Answer: C. sterilization
194. Moist heat kills microbes by:
Answer: B. protein coagulation
195. Dry heat kills microbes by:
Answer: B. oxidation of microbial constituents
196. Heat-sensitive substances such as antibiotics and sera are sterilized by:
Answer: C. membrane filters
197. Pasteurization of milk is done at:
Answer: C. 71 degrees for 15 seconds or 62 degrees for 30 minutes
198. Pasteurization reduces the risk of:
Answer: B. typhoid and tuberculosis
199. Food preservation by low temperature is done at:
Answer: B. 10 to 15 degrees
200. Freezing for food preservation uses temperatures of:
Answer: C. minus 10 to minus 18 degrees
About Biology Class 11 Unit 6 MCQs (Federal Board)
These 227 Biology MCQs cover Class 11 Unit 6: Prokaryotes of the Federal Board (FBISE) HSSC-I (1st Year / Class 11) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. The questions are split over 5 pages of 50. Use the Print button to save this chapter as a PDF.