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Class 12 Biology Practice Test: Organisms and Populations - Growth Models
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Class 12 Biology Practice Test: Organisms and Populations - Growth Models
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25 Questions

1. Which phase does ‘X’ in the given figure of the sigmoidal curve indicate?
Stationary phase graph where population achieves zero growth in stationary phase
2. Which phase does ‘a’ in the given figure of the exponential curve indicate?
The given graph indicates lag phase where population tries to adopt new environment
3. Which of the following initial phase is slow?
4. Which is the third phase in the logistic growth curve of the population?
5. When responses in a population are limiting which growth is observed?
6. What do organisms in a population do in the lag phase?
7. Which shape does the exponential growth curve show?
8. What does the red line in the given figure indicate?
Exponential growth graph with J-shaped curve when resources in population are unlimited
9. In which phase population achieves zero growth?
10. In which growth the environmental resistance suddenly occurs?
11. In which of the following phase do organisms in a population multiply at a faster rate?
12. What does ‘K’ in the given figure of the sigmoidal curve indicate?
The sigmoidal curve indicate carrying capacity
13. Which letter is used to designate the carrying capacity of a population?
14. Which of the following is a S-shaped growth curve?
15. Exponential growth is observed in which fashion?
16. What happens in the deacceleration phase?
17. When responses in a population are unlimited which growth is observed?
18. Which is the second phase of the sigmoidal growth curve?
19. How many phases does a logistic growth curve have?
20. What does the blue line in the given figure indicate?
The sigmoidal growth graph with logistic/ S-shaped growth curve
21. What happens in the negative down acceleration phase?
22. What is a sigmoid growth curve called?
23. Which is the initial phase in logistic growth?
24. In which phase is the stationary phase absent?
25. In which curve the population density shows a sudden crash?

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