Ecosystem Test 3

Total Questions:50 Total Time: 75 Min

Remaining:

 

Questions 1 of 50

Question:Which one statement ecosystem

Answers Choices:

They are highly efficient

They are poor in diversity

They are vulnerable to drought, floods and diseases

All are correct

Questions 2 of 50

Question:Phosphorus usually becomes a limiting factor at certain times of the year in which ecosystem

Answers Choices:

Aquatic ecosystem

Grassland ecosystem

Forest ecosystem

All the above

Questions 3 of 50

Question:Food and energy relationships among living components of ecosystem is generally referred as

Answers Choices:

Biocoenosis

Microcosm

Bioenergetic approach

None of the above

Questions 4 of 50

Question:Detritus food chain starts from

Answers Choices:

Dead organic matter

Green plants

Zooplanktons

None of the above

Questions 5 of 50

Question:In ecological crisis, whose interference play important role

Answers Choices:

Green plants

Human

Biotic and abiotic components

None of these

Questions 6 of 50

Question:The trophic level of S-bacteria and cyanobacteria is

Answers Choices:

Producer

Consumer

Saprotrophic decomposer

Phagotroph

Questions 7 of 50

Question:If plant (producers) of an ecosystem die, then the system

Answers Choices:

Cannot produce food

Is seriously affected

Can have more producers

Is not much affected

Questions 8 of 50

Question:The order of organism in an aquatic food chain is

Answers Choices:

Bacteria \( \to \) Seal \( \to \) Diatom \( \to \) Fish \( \to \) Crustacea

Crustacea \( \to \) Seal \( \to \) Fish \( \to \) Polar Bear \( \to \) Diatom

Polar Bear \( \to \) Diatom \( \to \) Seal \( \to \) Crustacea

Diatom \( \to \) Crustacea \( \to \) Fish \( \to \) Seal \( \to \) Bacteria

Questions 9 of 50

Question:An ecosystem resists change because it is in a state of

Answers Choices:

Homoeostasis

Regular illumination

Static imbalance

Food accumulation

Questions 10 of 50

Question:The total rate of photosynthesis including the organic matter used up in respiration during definite period is known as

Answers Choices:

Gross primary productivity

Net primary productivity

Secondary productivity

None of above

Questions 11 of 50

Question:Which one of the following system constitutes the primary producers

Answers Choices:

Higher plants

Algal phytoplanktons

Bryophytes

All the above

Questions 12 of 50

Question:Which one of the following ecosystems is more productive in terms of carbon dioxide fixation

Answers Choices:

Crop ecosystem

Forest ecosystem

Aquatic ecosystem

Hot spring ecosystem

Questions 13 of 50

Question:The second order consumer in a food chain is

Answers Choices:

Cattle

Deer

Tiger

Goat

Questions 14 of 50

Question:First link in any food chain is a green plant because

Answers Choices:

Green plants can synthesize food

They can eat everything

Fixed at one place

None of the above

Questions 15 of 50

Question:The number of primary producer within a specified area would be maximum in

Answers Choices:

Pond ecosystem

Grassland

Desert

Forest ecosystem

Questions 16 of 50

Question:Nepenthes is a

Answers Choices:

Primary producer

Consumer

Primary producer and consumer

None of the above

Questions 17 of 50

Question:Which one of the following components of ecosystem comes from outside

Answers Choices:

Oxygen

Temperature

Insects

Energy

Questions 18 of 50

Question:Snake generally belongs to

Answers Choices:

Saprophytes

Primary consumer

Second trophic level

None of these

Questions 19 of 50

Question:In an ecosystem decomposer include

Answers Choices:

Bacteria and fungi

Only microscopic organisms

Above two

Above two plus macro-organisms

Questions 20 of 50

Question:Flow of energy declines from low to higher trophic level in ecosystem, is mainly explained by

Answers Choices:

First law of thermodynamics

Second law of thermodynamics

Both of these

None of the above

Questions 21 of 50

Question:Driving force of an ecosystem is

Answers Choices:

Producer

Carbohydrates in plants

Biomass

Solar energy

Questions 22 of 50

Question:Largest ecosystem of the world are

Answers Choices:

Grasslands

Great lakes

Oceans

Forests

Questions 23 of 50

Question:Energy storage at consumer level is called

Answers Choices:

Gross primary productivity

Secondary productivity

Net primary productivity

Net productivity

Questions 24 of 50

Question:Ecosystem is

Answers Choices:

Open

Closed

Both open and close

Neither open nor closed

Questions 25 of 50

Question:What is maximum in a pond-ecosystem

Answers Choices:

Primary consumers

Secondary consumers

Producers

Decomposers

Questions 26 of 50

Question:In a pond if there is too much wastage, then the BOD of pond will

Answers Choices:

Increase

Decrease

Remain same

(1) and (2)both

Questions 27 of 50

Question:Which of the following abundantly occurs in pond ecosystem

Answers Choices:

Producer

Consumer

Top consumer

Decomposers

Questions 28 of 50

Question:If all decomposers are removed from an ecosystem, what will happen

Answers Choices:

All consumers will die

Energy cycle will be affected

Balance of biogeochemical cycle will be disturbed

Only herbivores will die

Questions 29 of 50

Question:Which of the following is the most stable ecosystem

Answers Choices:

Mountain

Desert

Forest

Ocean

Questions 30 of 50

Question:Which one of the following is a correct food chain

Answers Choices:

Grasshopper \( \to \) Grass \( \to \) Snake \( \to \) Frog \( \to \) Eagle

Grass \( \to \) Grasshopper \( \to \) Frog \( \to \) Snake \( \to \) Eagle

Eagle \( \to \) Snake \( \to \) Grasshopper \( \to \) Grass \( \to \) Frog

Frog \( \to \) Snake \( \to \) Eagle \( \to \) Grasshopper \( \to \) Grass

Questions 31 of 50

Question:The correct path of energy flow in an ecosystem is

Answers Choices:

Producers \( \to \) Carnivores \( \to \) Herbivores \( \to \) Decomposers

Producers \( \to \) Herbivores \( \to \) Carnivores \( \to \) Decomposers

Herbivores \( \to \) Carnivores \( \to \) Producers \( \to \) Decomposers

Herbivores \( \to \) Producers \( \to \) Carnivores \( \to \) Decomposers

Questions 32 of 50

Question:Which of the following ecosystem has the highest gross primary productivity

Answers Choices:

Grassland

Coral reef

Mangroves

Rain forest

Questions 33 of 50

Question:Biological equilibrium is found among the

Answers Choices:

Producer plants

Consumers and producers

Decomposers

Producers, consumers and decomposers

Questions 34 of 50

Question:The snakes are included under

Answers Choices:

Saprophytes

Primary consumers

Second trophic level

None of these

Questions 35 of 50

Question:The zooplanktonic forms are

Answers Choices:

Primary consumers

Secondary consumers

Carnivores

Primary producers

Questions 36 of 50

Question:Which one of the following regarding ecological pyramid is not correct

Answers Choices:

In most ecosystems, the pyramid of numbers and biomass are upright

In tree-dominated ecosystem the pyramid of numbers is inverted

The pyramid of energy expresses mainly the rate of food production

In deep water ecosystem, the pyramid of biomass is upright

The total energy flow at successive trophic level always decreases.

Questions 37 of 50

Question:The maximum biomagnification would be in which of the following in case of aquatic ecosystem

Answers Choices:

Fishes

Birds

Zooplanktons

Phytoplanktons

Questions 38 of 50

Question:The lentic ecosystem includes which of following water

Answers Choices:

Rain

Running

Standing

Gravitational

Questions 39 of 50

Question:Which of the following is source of energy to an ecosystem

Answers Choices:

Solar energy

Sugar stored

Heat liberated during respiration

ATP

Questions 40 of 50

Question:Food chain consists of

Answers Choices:

Producer, consumer and decomposer

Producer, carnivore and decomposer

Producer and primary consumer

Producer, herbivore and carnivore

Questions 41 of 50

Question:Animals which live at the bottom of sea are

Answers Choices:

Nekton

Diatom

Benthos

Plankton

Questions 42 of 50

Question:Which are the biotic components of forest ecosystem

Answers Choices:

Producers

Decomposers

Consumers

All of the above

Questions 43 of 50

Question:Which of the following is most important abiotic factor in pond ecosystem

Answers Choices:

Water

Phytoplankton

Zooplankton

Temperature

Questions 44 of 50

Question:The bacteria that attack dead organic matter are

Answers Choices:

Producer

Herbivore

Carnivores

Decomposers

Questions 45 of 50

Question:10% law of flow of energy in ecosystem was proposed by

Answers Choices:

Lindeman

Carl Mobius

Tansley

Darwin

Questions 46 of 50

Question:When spontaneous process occurs then free energy of system

Answers Choices:

Decrease

Increase

Remains same

Either can increase or decrease

Questions 47 of 50

Question:The maximum biomass of living diatoms is to be found in

Answers Choices:

Marine pelagic habitats

Moist soil and swamps

Deep coastmines

Salt lakes

Questions 48 of 50

Question:If decomposers are removed what will happen to the ecosystem

Answers Choices:

Energy cycle is stopped

Mineral cycle is stopped

Consumers cannot absorb solar energy

Rate of decomposition of mineral increases

Questions 49 of 50

Question:Inverted pyramid is found in

Answers Choices:

Biomass pyramid of aquatic system

Energy pyramid of grassland

Biomass pyramid of grassland

Pyramid of number of aquatic system

Questions 50 of 50

Question:Which of the food chains directly depends on solar radiations

Answers Choices:

Predator

Grazing

Detritus

None of these