MCQOPTIONS
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MCQOPTIONS
This section includes 14620 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 8501. |
Transfer of material and energy from one ecosystem to other ecosystem is best examplified by |
| A. | Harvesting of fishes |
| B. | Grazing of pastureland |
| C. | Game hunting in Savannah |
| D. | Silvicultural practices in a woodland |
| Answer» B. Grazing of pastureland | |
| 8502. |
In an ecosystem, the largest population is of |
| A. | Producers |
| B. | Consumers |
| C. | Decomposers |
| D. | Omnivores |
| Answer» B. Consumers | |
| 8503. |
Primary producer of an ecosystem is |
| A. | Herbivores |
| B. | Carnivores |
| C. | Both a and b |
| D. | Green plants |
| Answer» E. | |
| 8504. |
The storage of organic matter not used by heterotrophs is termed as |
| A. | Gross primary production |
| B. | Net secondary production |
| C. | Net production |
| D. | Secondary production |
| Answer» D. Secondary production | |
| 8505. |
Under what condition, the upright pyramid of biomass becomes inverted |
| A. | Grassland ecosystem |
| B. | Terrestrial ecosyslem |
| C. | Pond ecosystem |
| D. | Tree ecosystem |
| Answer» D. Tree ecosystem | |
| 8506. |
The pyramid of energy is the best representation of an ecosystem because it indicates |
| A. | Relation of all plants and animals |
| B. | Total energy present in an ecosystem |
| C. | The rate of food flow through the food chain |
| D. | None of these |
| Answer» D. None of these | |
| 8507. |
The pyramid of biomass and the pyramid of number represent |
| A. | The rate of energy flow |
| B. | The rate of food production |
| C. | Standing crop |
| D. | Relationship among organisms |
| Answer» E. | |
| 8508. |
Idea of productivity of an ecosystem can be had from |
| A. | Pyramid of number |
| B. | Pyramid of biomass |
| C. | Height of the plant |
| D. | Development of foliage |
| Answer» C. Height of the plant | |
| 8509. |
In an ecosystem, there are more prey than predators. This relationship is called |
| A. | Food webs |
| B. | Predator-prey relationship |
| C. | Pyramid of number |
| D. | Succession |
| Answer» D. Succession | |
| 8510. |
An ecosystem resists change because it is in a state of |
| A. | Homoeostasis |
| B. | Regular illumination |
| C. | Static imbalance |
| D. | Food accumulation |
| Answer» B. Regular illumination | |
| 8511. |
If plant (producers) of an ecosystem die, then the system |
| A. | Cannot produce food |
| B. | Is seriously affected |
| C. | Can have more producers |
| D. | Is not much affected |
| Answer» C. Can have more producers | |
| 8512. |
The net primary productivity of an ecosystem is |
| A. | Total weight of green plants - respiratory losses |
| B. | Total weight of green plants + respiratory losses |
| C. | Respiratory losses alone |
| D. | None of the above |
| Answer» B. Total weight of green plants + respiratory losses | |
| 8513. |
The trophic level of S-bacteria and cyanobacteria is |
| A. | Producer |
| B. | Consumer |
| C. | Saprotrophic decomposer |
| D. | Phagotroph |
| Answer» B. Consumer | |
| 8514. |
The trophic level of mushroom and Monotropa is |
| A. | Producer |
| B. | Primary consumer |
| C. | Secondary consumer |
| D. | Decomposer |
| Answer» D. Decomposer | |
| 8515. |
The trophic level of Cuscuta, Orobanche and Albugo is |
| A. | Decomposer |
| B. | Primary producer |
| C. | Primary consumer |
| D. | Secondary consumer |
| Answer» D. Secondary consumer | |
| 8516. |
In lake ecosystem the population rise or its explosion is termed |
| A. | Tide |
| B. | Bloom |
| C. | Plankton |
| D. | Nekton |
| Answer» C. Plankton | |
| 8517. |
Plankton, nekton and benthos are not the components of |
| A. | River ecosystem |
| B. | Oceanic ecosystem |
| C. | Savannah ecosystem |
| D. | Lake ecosystem |
| Answer» D. Lake ecosystem | |
| 8518. |
Which of the following is a man made artificial ecosystem |
| A. | Grassland ecosystem |
| B. | Agro-ecosystem |
| C. | Ecosystem of artificial lakes and dams |
| D. | Forest ecosystem |
| Answer» C. Ecosystem of artificial lakes and dams | |
| 8519. |
Dynamic aspect of an ecosystem is |
| A. | Producer and energy flow |
| B. | Producer and mineral cycles |
| C. | Consumer and mineral cycles |
| D. | Energy flow and mineral cycles |
| Answer» E. | |
| 8520. |
Given below is one of the types of ecological pyramids This type represents [AIIMS 2005] |
| A. | Pyramid of numbers in a grassland |
| B. | Pyramid of biomass in a fallow land |
| C. | Pyramid of biomass in a lake |
| D. | Energy pyramid in a spring |
| Answer» D. Energy pyramid in a spring | |
| 8521. |
In a food chain, the total amount of living material is depicted by [Pb. PMT 2004] |
| A. | Pyramid of biomass |
| B. | Pyramid of energy |
| C. | Pyramid of number |
| D. | Trophic levels |
| Answer» B. Pyramid of energy | |
| 8522. |
The Great Barrier Reef along the east coast of Australia can be categorised as [AIIMS 2004] |
| A. | Population |
| B. | Community |
| C. | Ecosystem |
| D. | Biome |
| Answer» D. Biome | |
| 8523. |
In an ecosystem [AIEEE 2004] |
| A. | Cycling of energy and nutrients is a coupled process |
| B. | Cycling of energy is an independent process |
| C. | Movement of energy is unidirectional |
| D. | Macro and micronutrients cycle at the same pace |
| Answer» D. Macro and micronutrients cycle at the same pace | |
| 8524. |
Area where two ecosystems overlap each other [Kerala PMT 2004] |
| A. | Niche |
| B. | Ecotype |
| C. | Edge line |
| D. | Ecotone |
| E. | Corridor |
| Answer» E. Corridor | |
| 8525. |
An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having [CBSE PMT 2004] |
| A. | Low stability and low resilience |
| B. | High stability and high resilience |
| C. | Low stability and high resilience |
| D. | High stability and low resilience |
| Answer» D. High stability and low resilience | |
| 8526. |
Bacteria and fungi in a forest ecosystem are generally [Kerala PMT 2004] |
| A. | Producers |
| B. | Decomposers |
| C. | Primary consumers |
| D. | Secondary consumers |
| E. | Tertiary consumers |
| Answer» C. Primary consumers | |
| 8527. |
Which of the following in an ecosystem exhibits one-way flow rather than cyclic flow |
| A. | Potassium |
| B. | Carbon |
| C. | Free energy |
| D. | Nitrogen |
| Answer» D. Nitrogen | |
| 8528. |
Which of the following is producer of plant kingdom |
| A. | Melia |
| B. | Ficus |
| C. | Ziziphus |
| D. | All the above |
| Answer» E. | |
| 8529. |
Decomposers are [Pb. PMT 2004] |
| A. | Autotrophs |
| B. | Heterotrophs |
| C. | Organotrophs |
| D. | Autoheterotrophs |
| Answer» C. Organotrophs | |
| 8530. |
A man-made ecosystem is [BHU 2004] |
| A. | Less in diversity |
| B. | More in diversity |
| C. | Man does not make ecosystem |
| D. | More stable than natural ecosystem |
| Answer» B. More in diversity | |
| 8531. |
Which of the following supports a dense population of plankton and littoral vegetation [BHU 2004] |
| A. | Oligotrophic |
| B. | Eutrophic |
| C. | Lithotrophic |
| D. | Agroecotrophic |
| Answer» C. Lithotrophic | |
| 8532. |
Which of the following organism form the decomposers [BHU 2004] |
| A. | Pteris |
| B. | Bacteria |
| C. | Saprophytic fungi |
| D. | Both b and c |
| Answer» E. | |
| 8533. |
Which of the food chains directly depends on solar radiations [MP PMT 2004] |
| A. | Predator |
| B. | Grazing |
| C. | Detritus |
| D. | None of these |
| Answer» C. Detritus | |
| 8534. |
Inverted pyramid is found in [MHCET 2003; Manipal 2005] |
| A. | Biomass pyramid of aquatic system |
| B. | Energy pyramid of grassland |
| C. | Biomass pyramid of grassland |
| D. | Pyramid of number of aquatic system |
| Answer» B. Energy pyramid of grassland | |
| 8535. |
If decomposers are removed what will happen ecosystem [BHU 2003] |
| A. | Energy cycle is stopped |
| B. | Mineral cycle is stopped |
| C. | Consumers cannot absorb solar energy |
| D. | Rate of decomposition of mineral increases |
| Answer» C. Consumers cannot absorb solar energy | |
| 8536. |
When spontaneous process occurs then free energy of system [DPMT 2003] |
| A. | Decrease |
| B. | Increase |
| C. | Remains same |
| D. | Either can increase or decrease |
| Answer» B. Increase | |
| 8537. |
A natural ecosystem |
| A. | Depends on man |
| B. | Depends on plants |
| C. | Depends on animals |
| D. | Is auto-operated |
| Answer» E. | |
| 8538. |
Which ecosystem shows maximum genetic diversity [AIEEE 2003] |
| A. | Coniferous forests |
| B. | Tropical rain forests |
| C. | Subtropical forests |
| D. | Temperate forests |
| Answer» C. Subtropical forests | |
| 8539. |
If bamboo plant is growing in a far forest then what will be its trophic level [CBSE PMT 2002] |
| A. | First |
| B. | Second |
| C. | Third |
| D. | Fourth |
| Answer» B. Second | |
| 8540. |
A food chain starts with [BVP 2002; MP PMT 2004] |
| A. | Nitrogen fixing organisms |
| B. | Photosynthesis |
| C. | Respiration |
| D. | Decomposers |
| Answer» C. Respiration | |
| 8541. |
Which of the following food chain may not be directly dependent upon solar energy [CBSE PMT 2002] |
| A. | Grazing |
| B. | Detritus |
| C. | Soaking |
| D. | Depleting |
| Answer» C. Soaking | |
| 8542. |
In a food web, each successive trophic level has [BHU 2002] |
| A. | Increased total energy |
| B. | Less total energy content |
| C. | More total energy content |
| D. | Non estimated energy content |
| Answer» C. More total energy content | |
| 8543. |
Source of energy in an ecosystem is [CPMT 2002] |
| A. | Sun |
| B. | ATP |
| C. | Sugar made by plants |
| D. | Green plant |
| Answer» B. ATP | |
| 8544. |
Maximum biomass and variable organism are found in [Orissa PMT 2002] |
| A. | River |
| B. | Pond |
| C. | Lake |
| D. | Estuary |
| Answer» C. Lake | |
| 8545. |
The above represents |
| A. | Food chain |
| B. | Food web |
| C. | A population |
| D. | Ecosystem |
| Answer» C. A population | |
| 8546. |
When peacock eats snakes which eat insects thriving on green plants, the peacock is [CPMT 2002] |
| A. | A primary consumer |
| B. | A primary decomposer |
| C. | Final decomposer |
| D. | The apex of food pyramid |
| Answer» E. | |
| 8547. |
The bacteria that attack dead organic matter are [MHCET 2001] |
| A. | Producer |
| B. | Herbivore |
| C. | Carnivores |
| D. | Decomposers |
| Answer» E. | |
| 8548. |
A plant being eaten by a herbivorous which in turn is eaten by a carnivorous makes [CBSE PMT 2002] |
| A. | Food chain |
| B. | Food web |
| C. | Omnivorous |
| D. | Interdependent |
| Answer» B. Food web | |
| 8549. |
Which of the following is most important abiotic factor in pond ecosystem [MHCET 2001] |
| A. | Water |
| B. | Phytoplankton |
| C. | Zooplankton |
| D. | Temperature |
| Answer» B. Phytoplankton | |
| 8550. |
Which are the biotic components of forest ecosystem [MP PMT 2001] |
| A. | Producers |
| B. | Decomposers |
| C. | Consumers |
| D. | All of the above |
| Answer» E. | |