Organisms that tolerate narrow range of salinity are
Euryhaline
Stenohaline
Eurythermal
Hypersaline
Hypersaline
B.
Stenohaline
Stenohaline organism is an organism that cannot tolerate a wide fluctuation in the salinity of water. Eg, fish
Euryhaline is an organism that is able to tolerate a wide range of salinity. Eg, molly.
Eurythermal organisms are the organisms that are able to tolerate a wide range of temperatures.
A hypersaline lake is a landlocked body of water that contains significant concentrations of sodium chloride or other salts.
Stenothermal is an organism that are able to tolerate only a small range of temperature.
The number of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration is known as
Emigration
Mortality
Natality
Immigration
Immigration
Match the items in Column I with their uses in Column II and choose the right option.
| Column I | Column II |
| A. ELISA | 1. Antigen - antibody interaction |
| B. PCR | 2. Gene amplification |
| C. Biolistics | 3. Direct introduction of recombinant DNA |
| D. Micro- injection | 4. Gold coated DNA |
A - 3; B - 4; C - 1; D - 2
A - 2; B - 1; C - 4; D - 3
A - 4; B - 1; C - 2; D - 3
A - 1; B - 4; C - 2; D - 3
A - 1; B - 4; C - 2; D - 3
The pioneer species in xerarch and hydrarch succession are respectively
Lichens and sedges
Phytoplanktons and sedges
Lichens and zooplanktons
Lichens and phytoplanktons
Lichens and phytoplanktons
Match the environmental activist in Column I with the environmental issue in Column II and choose the right option
| Column I | Column II |
| 1. Ramesh Chandra Dagar | A. Conservation od forests |
| 2. Ahmed Khan | B. Organic farming |
| 3. Amrita Devi | C. Plastic waste recycling. |
1 - B; 2 - C; 3 - A
1 - C; 2 - A; 3 - B
1 - A; 2 - B; 3 - C
1 - B; 2 - A; 3 - C
1 - B; 2 - A; 3 - C
The figure below is the diagrammatic representation relative contribution of various greenhouse gases to total global warming. What do (a), (b), (c) and (d) represent respectively?
A - Carbon dioxide; B - Methane; C - CFCs; D - N2O
A - Carbon dioxide; B - CFClC; C - Methane; D - N2O
A - Carbon dioxide; B - N2O ; C - CFClC; D - Methane
A - Carbon dioxide; B - Methane; C - N2O ; D - CFCs
A - Carbon dioxide; B - Methane; C - N2O ; D - CFCs
The asscoiation that includes herbivores and phytophagous insects is called
Competition
Parasitism
Predation
Commensalism
Commensalism
The Montreal Protocol (1987) refers to
Presistent organic pollutants
Global warming and climatic changes
Biosafety of genetically modified organisms
Controlling the emission of ozone depleting substances
Controlling the emission of ozone depleting substances
Match mean annual precipitation in Column I with the biome in Column II and choose the right option.
| Column I | Column II |
| 1. 0-50 cm | A. Tropical forest |
| 2. 50-100 cm | B. Coniferous forest |
| 3. 150-400 cm | C. Grassland |
| 4. 50-250 cm | D. Desert |
1 - D; 2 - C; 3 - A; 4 - B
1 - C; 2 - A; 3 - B; 4 - D
1 - C; 2 - D; 3 - A; 4 - B
1 - B; 2 - D; 3 - A; 4 - C
1 - B; 2 - D; 3 - A; 4 - C
The gross primary productivity of an ecosystem is 170 tons organic matter and amount used in respiration is 50 tons. Calculate the net primary productivity of the ecosystem.
120 tons
100 tons
70 tons
12 tons
12 tons
