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Class 12 Biology Chapter 13 Organisms And Populations Quiz 1 (25 MCQs)

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1. The study of inter-relationship between living organisms and their environment is called
2. A protozoan reproduces by binary fission. What will be the number of protozoans in its population after six generations?
3. The interaction found between Balanus and chathamalus is
4. What are the key elements that lead to so much variation in the physical and chemical conditions of different habitats?
5. Among the ecosystem mentioned below, where can you find the maximum biodiversity?
6. A group of different species that live together and interact in an environment are called a/an .....
7. According to Allens rule, the mammals from colder climates have
8. Formation of tropical forests needs mean annual temperature and mean annual precipitation as:
9. Which of the following is the most ecologically relevant environmental factor?
10. False statement is-
11. Gause's principle of competitive exclusion states that: .....
12. Community is the level of organization which is best described as all-
13. "Bio" is a prefix that means .....
14. The maximum amount of organisms of a species that can be supported by an environment is:
15. If '+' sign is assigned to beneficial interaction '-' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '-' refers to: .....
16. Immediately after a forest fire, the primary consumers in the area will compete most for which biotic factor?
17. Not living, or produced by living things
18. At what level of organization in an ecosystem is an individual plant or animal?
19. Plants interact with living and nonliving components in their environment. Which is an interaction with a nonliving element?
20. Individuals of a species which occur in a particular area constitute
21. What parameters are used for tiger census in our country's national parks and sanctuaries?
22. What will happen to a well growing herbaceous plant in the forest if it is transplanted outside the forest in a park?
23. More than one individual or population in an ecosystem relies upon the same limited resources
24. Which is an example of a seasonal change to a BIOTIC factor?
25. A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is .....
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