101. The dispersion of individuals in a population is:
Answer: C. distribution
Biology Class 11 Unit 15: Ecology MCQs
196 multiple choice questions with the correct answer for each. Tap an option to check yourself, or switch on "Show all answers". This is page 3 of 4.
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102. The three patterns of population distribution are:
Answer: C. clumped, uniform and random
103. Individuals aggregated in patches show a ... distribution:
Answer: C. clumped
104. The maximum population size that can be supported by the available resources is the:
Answer: B. carrying capacity
105. The carrying capacity is:
Answer: B. not fixed but varies with abundance of limiting resources
106. Which activity of humans results in habitat fragmentation?
Answer: B. Roads, dams and urban expansion
107. Large-scale clearing of forests is called:
Answer: B. deforestation
108. Acid rain and smog are caused by:
Answer: B. air pollution from industries and vehicles
109. Excessive fishing causing decline in fish populations is:
Answer: B. overfishing (overexploitation)
110. Planting a large area with a single crop is:
Answer: B. monoculture farming
111. Monoculture:
Answer: B. reduces biodiversity and makes ecosystems more vulnerable to diseases
112. Invasive species:
Answer: B. outcompete native species for resources and may cause extinction
113. The greenhouse effect is a:
Answer: B. natural process that warms the earth by trapping heat radiation
114. The most common greenhouse gas emitted by human activities is:
Answer: C. carbon dioxide
115. Which gas has a much higher heat trapping ability than CO2?
Answer: C. Methane
116. Livestock and agricultural practices contribute to the emission of:
Answer: B. methane
117. Nitrous oxide is released from:
Answer: B. agricultural and industrial activities and combustion of fossil fuels
118. Fluorinated gases are:
Answer: B. synthetic gases used in industrial applications
119. Fluorinated gases include:
Answer: B. HFCs, PFCs, SF6 and NF3
120. The long-term increase in earth's average surface temperature is:
Answer: B. global warming
121. Melting ice caps leads to:
Answer: B. rising sea level threatening coastal ecosystems
122. Excess CO2 in the atmosphere absorbed by oceans causes:
Answer: B. ocean acidification (fall in pH)
123. About what percent of CO2 released is absorbed by oceans?
Answer: C. 25
124. In seawater CO2 combines with water to produce:
Answer: D. carbonic acid, lowering the pH
125. Ocean acidification mainly harms organisms with:
Answer: B. calcium carbonate shells or skeletons such as corals, molluscs
126. Coral reefs are made up of colonies of tiny animals called:
Answer: B. coral polyps
127. Coral polyps secrete:
Answer: C. calcium carbonate skeletons
128. Coral reefs are called "rainforests of the sea" because of their:
Answer: C. incredible biodiversity
129. Coral polyps live in a symbiotic relationship with:
Answer: C. photosynthetic algae (zooxanthellae)
130. The algae give corals their:
Answer: B. vibrant colours and nutrients
131. Corals are used as a barometer of the health of:
Answer: C. aquatic ecosystem
132. Coral reefs serve as natural barriers that:
Answer: B. protect coastlines from erosion and storms
133. Reefs are found in:
Answer: C. shallow, tropical and subtropical waters
134. The thin life-containing blanket around the earth is the:
Answer: C. biosphere
135. The ozone layer screens:
Answer: C. ultraviolet radiation
136. Which of the following is a desert of Pakistan?
Answer: C. Thar
137. Annual rainfall in desert regions of Pakistan is about:
Answer: C. 100 to 250 mm
138. In desert regions the rainfall mainly occurs from:
Answer: C. July to September (monsoon)
139. Summer temperature in deserts of Pakistan may reach:
Answer: C. above 40 degrees and sometimes 50 degrees Celsius
140. Common desert plants are:
Answer: C. xerophytes like cacti, Acacia and Prosopis
141. Desert mammals include:
Answer: B. jerboas, desert gerbils, desert foxes and wild cats
142. Primary productivity in deserts is:
Answer: C. relatively low due to scarcity of water and limited plant cover
143. Desert animals avoid heat by being:
Answer: B. nocturnal and by burrowing
144. Desert plants conserve water by:
Answer: C. modified leaves or stems and deep root systems
145. Tropical grasslands in Pakistan are also known as:
Answer: C. savannas
146. Tropical grassland rainfall varies from about:
Answer: B. 200 to 600 mm during monsoon
147. A common grass of Pakistan grasslands is:
Answer: B. Cenchrus ciliaris (buffel grass)
148. Grassland fauna include:
Answer: B. deer, antelopes, gazelles, wild goats, rodents, foxes and wolves
149. Temperate grasslands in Pakistan are found in:
Answer: B. Balochistan and parts of Punjab
150. Temperate grasslands have ... productivity than tropical grasslands:
Answer: C. lower
About Biology Class 11 Unit 15 MCQs (Federal Board)
These 196 Biology MCQs cover Class 11 Unit 15: Ecology 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 4 pages of 50. Use the Print button to save this chapter as a PDF.