12th Class Biology Mcqs with Answers Chapter 26 | 2nd year Biology Mcqs With Answers

Chapter 26

Some Major Ecosystem

Encircle the most appropriate answer among the following options

1. The earth’s climates are primarily effected by the circulation pattern of choose which one is correct:

• The benthic zone
• The lithosphere
• The atmosphere
• Phytoplankton

2. Which biome supports the greatest species diversity?

• Coniferous forest
• Deciduous forest
• Grassland
• Tropical rain forest

3. Which biome supports the least species diversity?

• Tundra
• Tropical rain forest
• Grassland
• Desert ecosystem

4. Which biome is characterized by plants that lose their leaves each autumn?

• Grassland
• Desert
• Deciduous forest
• Coniferous forest

5. Which of the followings is an essential requirement for life?

• Water
• Soil
• CO
• Wild life

6. Grassland in tropic climates have woody trees and are called choose which one is correct:

• Pampas
• Prairies
• Velt
• Savanna

7. The average annual rain fall of temperate deciduous forests is between choose which one is correct:

• 100-750 mm
• 750-1500 mm
• 1500-2000 mm
• 1000-1500 mm

8. Coniferous forests of high altitude are known as choose which one is correct:

• Alpine
• Aretic
• Boreal
• Tundra

9. Deserts generally occur in region where annual rain fall is less than choose which one is correct:

• 15-20 cm
• 5-10 cm
• 250-270 cm
• 25-50 cm

10. Cacti and Euphorbia are desert plants which store water in their choose which one is correct:

• Leaves
• Root
• Stem
• Bunds

11. Primary consumer animals may also be called as choose which one is correct:

• Carnivores
• Decomposers
• Herbivores
• Omnivores

12. Limnetic phytoplanktons include choose which one is correct:

• Crustaceans
• Cynobacteria
• Rotifers, fishes and planktons
• Protozoan

13. The zone of deep standing water under the limnetic zone is known as choose which one is correct:

• Profundal zone
• Benthic zone
• Limnetic zone
• Littoral zone

14. In temperate grassland the rate of primary production is about choose which one is correct:

• 1000-2000 g/m² annually
• 100-600 g/m² annually
• 700-1500 g/m² annually
• 8000-18000 g/m² annually

15. Which of the followings is not correctly matched?

• Herbivores  choose which one is correct: Autotroph
• Producer  choose which one is correct: Autotroph
• Carnivores  choose which one is correct: Consumer
• Producer  choose which one is correct: Plants

16. Distribution of biomes on earth is primarily due to pattenrs of choose which one is correct:

• Animal and predators
• temperature and rainfall
• Soil and animal
• Wind and soil

17. Herbivores choose which one is correct:

• Tundra
• Plant eater
• A lake’s open lighted water
• Coniferous forests at high altitude

18. Limnetic zone choose which one is correct:

• A lake’s open lighted water
• Dominated by evergreen trees
• Tundra
• Plant eater

19. Boreal choose which one is correct:

• Tundra
• Plant eater
• Coniferous forests at high altitude
• A lake’s open lighted water

20. Coniferous forest choose which one is correct:

• A lake’s open lighted water
• Dominated by evergreen trees
• Tundra
• Plant eater

21. Lichen choose which one is correct:

• Desert
• Reindeer moss
• Fungi
• Stipa

22. Decomposer choose which one is correct:

• Desert
• Fungi
• Reindeer moss
• Stipa

23. Thal choose which one is correct:

• Stipa
• Desert
• Fungi
• Reindeer moss

24. Primary consumer choose which one is correct:

• Grasshopper
• Fungi
• Reindeer moss
• Stipa

25. Climate choose which one is correct:

• Region of deep water zone
• Region of shallow water at lake’s edge
• Autotroph
• Prevailing weather in an area

26. Littoral zone choose which one is correct:

• Region of deep water zone
• Autotroph
• One criterion used in constructing ecological pyramids
• Region of shallow water at lake’s edge

27. Biomass choose which one is correct:

• One criterion used in constructing ecological pyramids
• Prevailing weather in an area
• Region of deep water zone
• Autotroph

28. Primary producer choose which one is correct:

• Prevailing weather in an area
• Region of deep water zone
• Autotroph
• One criterion used in constructing ecological pyramids

29. Profundal zone choose which one is correct:

• Drifiting plant
• High altitude
• Refers to lake floor
• Submerged plant

30. Ecosystem choose which one is correct:

• Refers to lake floor
• Submerged plant
• High altitude
• Include the community and physical environment

31. Arctic tundra choose which one is correct:

• Drifting plant
• Refers to lake floor
• Submerged plant
• High altitude

32. Phytoplankton choose which one is correct:

• High altitude
• Drifting plant
• Submerged plant
• Refers to lake floor

33. The soil of terrestrial ecosystems have some adaptations for animals and

plants choose which one is correct:

• Supporting tissues
• Retention of food
• Temperature
• Nutrients

34. Most plants fit only into a few ecosystems, which type of plant seems in

ecosystem of grassland choose which one is correct:

• Trees
• Shrubs
• Perennial herbs
• Annual weeds

35. In which type of ecosystem, the smallest fraction of nutrients is present in soil?

• Savanna
• Tundra
• Grassland
• Desert

36. What biome will be with richest soil with nutrients and can be converted into agriculture?

• Deciduous forests
• Tropical rain forest
• Grassland
• Coniferous forest

37. Which of the biomes has been increased in area by human activities?

• Savanna
• Grassland
• Desert
• Coniferous

38. Saltwater ocean and sea being the largest ecosystems on earth occupy about what percentage of its surface.

• 1%
• 50%
• 71%
• 85%

39. Fresh water ecosystem covers less than choose which one is correct:

• 1%
• 50%
• 75%
• 95%

40. Which ecosystem is divided into littoral, limnetic and profundal zones?

• Fresh water lakes
• Temperate deciduous forests
• Tundra
• Desert

41. Which one is not correct for littoral zone?

• Shallow water
• Abundant light
• Planktons
• Detritus feeders

42. Which one is not related with process of eutrophication?

• Excessive growth of phytoplanktons
• Depletion of oxygen
• Foul smelling gases like H₂S
• Fish dominate the community

43. Which one is not a forest ecosystem?

• Tropical rain ecosystem
• Grassland ecosystem
• Temperate de ciduous ecosystem
• Coniferous alpine and boreal forest

44. Average rain fall in temperate deciduous forest is choose which one is correct:

• 750  1500 mm
• 500  1000 mm
• 250  750 mm
• 1500  3000 mm

45. Northern coniferous forests are called choose which one is correct:

• Alpine
• Boreal
• Talga
• Tundra

46. Grasslands in temperate climates are called choose which one is correct:

• Prairies
• Savanna
• Taiga
• Tundra

47. The dominant plants of grasslands are choose which one is correct:

• Trees
• Legumes
• Graminoids
• Shrubs

48. What is the annual rate of primary production in temperate grassland?

• 300  400 g/m²
• 700  1500 g/m²
• 1500  4000 g/m²
• More than 4000 g/m²

49. Annual rainfall in deserts is less than choose which one is correct:

• 1500 mm
• 1000 mm
• 750 mm
• 250 mm

50. Which one is not a desert?

• Thal
• Thar
• Sahara
• Taiga

51. The largest desert in the world is choose which one is correct:

• Gobi
• Sahara
• Thar
• Thal

52. The Sahara desert is found in choose which one is correct:

• Asia
• America
• Africa
• Europe

53. Gobi desert is found in choose which one is correct:

• Australia
• Sindh
• Cholistan
• Mongolia

54. Annual average rain fall in deserts is less than choose which one is correct:

• 25  30 cm
• 25  35 cm
• 25  40 cm
• 25  50 cm

55. Cacti and Euphorbias are the plants of choose which one is correct:

• Forests
• Grasslands
• Deserts
• Tundra

56. A dramatic example of process of desertification is choose which one is correct:

• Taiga
• Tundra
• Sahara
• Sahel

57. Which one is not related with Tundra?

• Low temperature
• Strong sweeping winds
• Short growing season
• Least fragile of all the biomes