Biology – Class 12 Practice Test 10

1. Which of the following statement is incorrect?

2. What is the killing of aquatic life due to the depletion of oxygen because of the excessive growth of algae due to the over-abundance of phosphorous in the coastal areas called?

3. Which of the following succession starts with the colonization of phytoplankton in the water?

4. How many species of birds are extinct due to the colonization of the tropical Pacific Islands by humans?

5. What is the reason for the increase in the BOD?

6. What will happen if key species that drive major ecosystem functions are lost?

7. How many categories can a nutrient cycle be divided?

8. What phenomenon occurs due to the accumulation of certain pollutants that increase in concentration along the food chain?

9. From which phenomenon is the term ‘Greenhouse effect’ derived?

10. Out of the total cost of various ecosystem services, how much is the cost of recreation and nutrient cycling?