The variety of living organisms in an ecosystem is called__________Ans:1. Community 2. dominant 3. niche
4. niche 5. succession 6. pioneer
7. limax 8. sere 9. ecosystems
10. webs 11. scavengers 12. littoral
13. limnetic 14. photic 15. estuary
16. 30 17. tundra 18. pollution
19. magnification 20. biodiversity
- Define community.
Ans: Community is composed of all populations living in an area.
- What is dominant specie of a community?
Ans: Species that determine community characteristics are called dominant species.
- What is community diversity or richness?
Ans: Communities contain variety of animals. These animals also characterized the community. This variety is called community diversity or richness.
- What is ecological niche? Give its attributes.
Ans: All the attributes of lifestyle of an animal is called ecological, niche. These attributes are: Where it looks for food? What it eats? Where it makes nest? What conditions of temperature and moisture it requires.
- Differentiate between pioneer and climax community. Ans: The first community establish in an area is called the pioneer community The final community is called climax community.
- Define an ecosystem. Give its examples.
Ans: Communities and their physical environment are called ecosystems. Their examples are pond ecosystem marine ecosystem etc.
- What are food chain and food web?
Ans: The sequence of organisms through which energy moves in an ecosystem is called food chain. Complexly interconnected food chains are called food webs.
- What are scavengers?
Ans: The consumers that feed on large chunks of dead and decaying organic matter are called scavengers.
- Differentiate between limnetic and profundal zone of pond.
Ans: The open water area where enough light can penetrate is called limnetic zone. The bottom area of a lake, where light cannot penetrate is called profundal zone.
- Differentiate between photic and aphotic zones of the ocean?
Ans: The open water of ocean where light can penetrate is called photic zone The zone below the aphotic zone where light cannot penetrate is called aphotic zone.
- What is an estuary?
Ans: The area where a freshwater stream or river merges with the ocean is
called an estuary.
Differentiate between Prairies and Savanna.
The grass land without woody trees is called prairies. The grassland with
scattered woody trees is called savanna.
Differentiate between Arctic tundra and Alpine tundra.
The tundra present on the high latitude is called arctic tundra. The tundra
present at high altitude is called alpine tundra.
What is meant by acid deposition?
Acid deposition or acid rain: Burning fossil fuels releases sulfur dioxide
and nitrogen oxides. Sulfur dioxide and water combine to produce sulfuric
acid. It falls as acid deposition (acid rain). Acid deposition lowers the pH of
Define biological magnification.
The accumulation of matter in food webs is called biological magnification.
True/ False (For Punjab University only)
Marks are True or False statement. Give correct statement if false
- Species that determine community characteristics are called recessive species.
- This variety is called community diversity or richness.
- All the attributes of lifestyle of an animal is called ecological control.
- The process of change a community in a predictable ways is called succession.
- The entire successional sequence is called niche.
- Communities and their physical environment are called ecosystems.
- The groupings of organisms on the basis of energy are called trophic levels.
- The area near shore is called limnetic zone.
- The bottom area of a lake, where light cannot penetrate is called profundal