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Class 12 Biology Chapter 13 Organisms And Populations Quiz 4 (25 MCQs)

Quiz Instructions

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1. If a population of 50 paramecium present in a pool increases to 150 after an hour, then what would be the growth rate of population .....

Correct Answer: A) 100 per hour.

2. Which of the following would necessarily decrease the density of a population in a given habitat?

Correct Answer: C) Mortality and emigration.

3. Which is an example of a BIOTIC factor in the environment?

Correct Answer: B) Carnivores that consume other animals.

4. The active chemical drug reserpine is obtained from

Correct Answer: B) Rauwolfia.

5. Which of the following is not a biotic factor?

Correct Answer: B) Air.

6. If a population grows larger than the carrying capacity:

Correct Answer: B) Birthrate must fall.

7. What is a abiotic factor?

Correct Answer: B) Things that are not living, and never were living.

8. Sunlight is an example of an

Correct Answer: A) Abiotic factor.

9. Which of the following correctly lists the levels of organization from least complex to most complex?

Correct Answer: C) Organism, Population, Community, Ecosystem.

10. Autecology is study of ecology of

Correct Answer: D) Both (b) and (c).

11. Which one is the famous plant ecologist of India?

Correct Answer: B) Ramdeva Misra.

12. Ecology (=oekologie) was coined by

Correct Answer: B) Haeckel.

13. A regional ecological unit having a specific climate is-

Correct Answer: A) Biome.

14. Two species of fish live in the same pond. Which of the following would increase competition between these two species of fish?

Correct Answer: D) Water level in the pond decreases.

15. Lizards and cacti are biotic factors in a desert ecosystem that would rely on which abiotic factors?

Correct Answer: D) Water and soil.

16. The highest level of ecological hierarchy is

Correct Answer: B) Biosphere.

17. A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is .....

Correct Answer: D) Symbiosis.

18. Temperature is an example of what kind of factor?

Correct Answer: B) Abiotic.

19. A population is a:

Correct Answer: B) Group of organisms of a single species that lives in a given area.

20. Which of the following lists includes only abiotic factors?

Correct Answer: B) Rainfall amounts, average daily temperature, minerals in soil.

21. If an invasive species is introduced to an ecosystem that eats that same plants as the rabbits in the ecosystem, what will happen to the rabbit population?

Correct Answer: B) The rabbit population will likely decrease.

22. Most animals are tree dwellers in a: .....

Correct Answer: A) Tropical Rain forest.

23. Which abiotic factor is phytoplankton most likely to compete for in a marine environment?

Correct Answer: A) Sunlight.

24. An organism that gets its energy by feeding on producers in the food chain

Correct Answer: D) Primary consumer.

25. An example of a population is

Correct Answer: B) All maple trees in a forest.

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