Exercise, 8th Sci., 18. Ecosystems

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• धड्यातील छोट्या छोट्या घटकांचा विचार करून स्वाध्याय तयार केला तर धड्याची संपूर्ण तयारी छान होते. यालाच आपण सूक्ष्मा कडून अनंताकडे असे म्हणू.
• स्वाध्याय रिकाम्या जागा या स्वरूपातच का? घेत आहोत तर त्या वाक्यासाठी योग्य शब्द म्हणजे रिकामी जागा. 
• पर्याय का देत नाही, पर्याय दिल्यास त्या चार पर्यायांपैकी एक उत्तर असणार आहे. म्हणजेच आपल्याला फक्त त्या चार शब्दांचाच विचार करायचा असतो.

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18. Ecosystems

1. How are abiotic factors obtained by producers?

2. National park/           State

Sanctuary                                     

1. Geer                   ---

2. Dachigam            --

3. Ranthambore     ---

4. Dajipur              --- 

5. Kaziranga         --

6. Sunderban        --

7. Melghat             ---

8. Periyar              --

3. The biomes that exist only on land are called ... biomes.

4. Define Ecosystems.

5. Elephants, wild bears, wild buffaloes, deer, tigers, and panthers are conserved at ... (Assam). 

6. What causes human races to go to war?

7. The ... factors in an ecosystem decide which biotic factors will survive in it and what their number will be.

8. 71% of the earth's surface is covered by water, and only ...% has land on it.

9. Why are humans the consumers in an ecosystem?

10. What is the role of microbes in interactions among factors of an ecosystem?

11. Geer forest in Gujrat is the only habitat/shelter for the spectacular Asiatic ... .

12. What will be the effects on biotic factors in the running water of the river?

13. Which factors do you find in your surroundings?

14. What kinds of ecosystems exist as a result of the uneven distribution of abiotic factors?

15. Write "true" or "false." The central part of the sea has fewer aquatic living organisms.

16. Describe how big dams affect the environment.

17. Rivers, ponds, and oceans are ... ecosystems.

18. Many ecosystems are conserved in around ... sanctuaries and national parks in India.

19. Define 'biomes.'

20. The environment we live in is composed of ... and nonliving elements.

21. What is meant by "niche"?

22. Why did the Asian cheetah become extinct in the last century?

(What led to the extinction of the Asian cheetah within the last century?)

23. The sanctuary at ... is famous for aquatic birds.

24. Air, water, minerals, and soil are... factors of an ecosystem.

25. The combination of biotic and abiotic elements creates a ...

26. What kinds of animals live in grassland environments?

27. From where do the consumers get their food?

28. List two different kinds of biomes that exist on Earth.

29. Draw a flowchart of the components of the ecosystem.

30. Can we call a tree an independent ecosystem?

31. List the four ecosystems that exist on Earth.

32. Ranthambore Sanctuary is famous for ... .

33. About 150 years ago, Dudhwa forest was the habitat for single-horned ... .

33. List the ecosystem's four abiotic components.

34. Which biotic factors get affected due to a dam?

35. The organic substances from dead bodies of plants and animals are converted into inorganic substances by microorganisms. Therefore, microbes are said to be '... .'

36. The Great Himalayan National Park is the largest sanctuary where ... the panther, a rare species, is conserved.

37. Match the following

Producers               Ecosystem

a. Cactus                1. Forest

b. Aquatic plants   2. Creek

c. Mangroves         3. Aquatic

d. Pine                    4. Desert

38. Write down three types of aquatic ecosystems.

39. What will happen if all honeybees are destroyed?

40. Rhinos were restored in Dudhwa Forest. Give a scientific reason.

41. Write three examples of natural disasters.

42. What are the possible threats to grasslands?

43. Two-thirds of the total number of single-horned rhinos in the world are found at ... .

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