est chp 6.2 quiz

WELCOMEENVIRONMENT QUIZ

1. Nitrogen Gas returns to the atmosphere by the action of

Denitrifying

bacteriaNitrogen fixing

bacteria

Nitrate Fertilizer ammonia

2. A molecule of nitrogen which you have just breathed in,may have been part of a dinosaur that lived million years ago . This illustrates the principle that

Dead animal may be fossilized Molecules of cytoplasm may be replaced by

oganic salts

Decay bacteria cycle element

Nitrogen does not combine readily with other element

Nitrogen forms part of the protiens of plants and animals

3. The sequence of energy flow through a food chain is

Primary consumers – producers – higher order consumers

Producers – higher order consumers - Primary consumers

Primary consumers - Higher order consumers –Producers

Higher order consumers - Primary consumers - Producers

Producers - Primary consumers - Higher order consumers

4. In a terristrial ecosystem , the tropic level that would contain the largest biomass would contain the largest biomass would be the

producer Primary consumers

decomposersSecondary comsumers

5. A carrot plant is exposed to carbondioxide containing radioactive carbon for 24 hr . After this exposure ,the carrot roots are found to be radioactivity . These carrots are then fed to rabbit . One week later,the rabitts tissue tested for radioactivity and is found to have a higher then normal background count . Which biogeochemical cycle is apparent from this study ?

Oxygen Carbon

NitrogenWater

6. The rate of growht of a natural population

Always reaches the carrying capacity of the ecosystem

Is limited the carrying capacity of the ecosystem

Exceeds the death rate and migration rate

When graphed,always has a positive slope

7. In the past decade,which of the following has NOT been a major cause of the increase in the world population.

Longer life span Lower infant mortality

Improved santination

Increase in birth rate

8. Which one of the following has not a functional unit in ecosystem ?

Productivity Decomposation

StratifactionEnergy Flow

9. The upright pyramid of number is absent in

Lake Grassland

ForestPond

10. Which only of the following is not a gaseous biochemical cycle in ecosystem ?

Nitrogen cycle Carbon cycle

Sulphur cyclePhosphorus cycle

11. Given below is an imaginary pyramid of numbers. What could be one of the possiblities about certain organisms at some of the different levels ?Level one PP is “pipal trees” and the level SC

“sheep”Level one PC is “rats”

and the level SC “cats”

Level PC is “insects” and level SC is “small

insectivorous birds”

Level one PP is “hytoplanktons” in sea

and “whale” on top level TC

12. Identify the possible link “A” in the following food chainPlant insect frog “A” Eagle

Wolf Parrot

CobraRabbit

13. The type of ecosystemwith the highest mean plant productivity is :

Tropical Rain Forest

Temprate Grassland

TundraDesert

14. In an aquatic ecosystem,the tropic level equivalent to cows in grasslands is :

Zooplankton Nekton

BenthosPhytoplankton

15. The final stable community in ecological succession is _________

Climax Sere

CarnivoresPioneers

16. An ecosystem which can be easily damaged but can recover after some time if damageing effect stops will be having ________________ .

Low Stability and high resilience

Low Stability and low

resilience

High Stability and high resilience

High Stability and low

resilience

17. Typical levels in ecosystem is formed by ____

Only Herbivores Only Plants

Organisms linked in food

chainOnly Bacteria

18. “Complete competitors cannot coexist” is true for ...

Primary succession Secondary seccession

Charecter Displacement

Competitive exclusion

19. Bell shaped polygonal pyramid indicates

Moderate Percentage of yonger youth

Low Percentage of yonger youth

Low Percentage of older youth

High Percentage of yonger youth

20. Theage of pyramid with board base indicates

Moderate Percentage of yonger youth

Low Percentage of yonger youth

Low Percentage of older youth

High Percentage of yonger youth

21. Which one of the following ecosystem types has the highest annual net primary productivity ?

Tropical

deciduous forest

Temperate deciduous

forestTemperate evergreen

forestTropical rain

forest

22. A renewable exhaustible natural resource is :

Petroleum Coal

ForestMinirals

23. When the two ecosystems overlap each other,the area is called ............

Habitat Ecotone

EcotypeNiche

24. Which of the following ecosystem type has the highest annual net primary productivity ?

Grasslands Mangroves

Coral reefEquatorial rain forest

25. In ___ Food Chain, Dead Organic Matter is serve as Principle energy input ….

Detritivores Producers

Producers and detritivores Non of this

26. Which of the following is correctly matched ?

Butterfly-camouflage

House lizard - autotomy

All of the abovegarden lizard -mimicry

27. consider the following list of factors

Soil Water

dispersal Air

28. About 70% of total global carbon is found in

Forest River

OceanLand and desert

29. Which of the animals may occupy more than one trophic levels in the same ecosystem at the same time ?

Goat Crow

LionSparrow

30. Which of the following statement is correct for secondary succession ?

It is similar to primary succession except that it has a relatively fast pace

Both

Non of the above

It occurs on a deforested site

31. Total amount of living material at he various trophic levels of a food chain is depicted by pyramids of

Biomass Number

All of the aboveHumans

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