Question

1. Of the following atmospheric gases, which one has shown the greatest increase in concentration in the atmosphere since 1750 and is now considered a greenhouse gas?

1. nitrogen
2. water vapour
3. carbon dioxide
4. sulfur dioxide
5. ozone

2. Introduced species that spread widely and become unduly abundant are known as

1. spreader species
2. invasive species
3. super species
4. keystone species
5. engineering species

3. Currently what is the greatest ecological crisis threatening marine ecosystems?

1. oil spills
2. radiation leaks
3. garbage dumping
4. overharvesting of fish
5. abandoned fishing nets

4. What is a negative side-effect of excessive irrigation of agricultural crops in arid regions?

1. desertification
2. wind erosion
3. nutrient accumulation
4. water erosion
5. evaporation

Answer 1

Answer of Question a) C. Carbon Dioxide

Answer of Quedtion b) B. Invasive Species

Answer of Question c) D. Overharvesting of Fish

Answer of Question d) D. Water erosion