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.
| 8551. |
Which of the following is an artificial ecosystem [MP PMT 2001] |
| A. | Rice-field |
| B. | Forest |
| C. | Grassland |
| D. | Lake |
| Answer» B. Forest | |
| 8552. |
The two vegetation of ecosystem are separated by [CPMT 2001] |
| A. | Ecotone |
| B. | Ecoline |
| C. | Ecosystem |
| D. | Ecesis |
| Answer» B. Ecoline | |
| 8553. |
When the number of organisms at successive levels are plotted, they assume the shape of a pyramid. This is called the pyramid of [CBSE PMT 2001; MHCET 2003] |
| A. | Energy |
| B. | Number |
| C. | Biomass |
| D. | Both a and c |
| Answer» C. Biomass | |
| 8554. |
Whale is |
| A. | Primary producer |
| B. | Carnivorous secondary consumer |
| C. | A decomposer |
| D. | Herbivorous |
| Answer» C. A decomposer | |
| 8555. |
In a food chain, the total amount of living material is depicted by [BHU 2001] |
| A. | Pyramid of energy |
| B. | Pyramid of numbers |
| C. | Pyramid of biomass |
| D. | All of these |
| Answer» D. All of these | |
| 8556. |
The ecosystem consists of [AIIMS 2001; BVP 2001] |
| A. | Producers |
| B. | Consumers |
| C. | Decomposers |
| D. | All of these |
| Answer» E. | |
| 8557. |
Transition zone between two ecosystems or vegetational regions is termed [HP PMT 2005; Kerala CET 2005] |
| A. | Ecocline |
| B. | Ecotone |
| C. | Ecad |
| D. | Barrier |
| Answer» C. Ecad | |
| 8558. |
During food chain the maximum energy is stored in [MHCET 2001; Pb. PMT 2004] |
| A. | Producers |
| B. | Decomposers |
| C. | Herbivores |
| D. | Carnivores |
| Answer» B. Decomposers | |
| 8559. |
Green plants are [BVP 2000] |
| A. | Autotrophs |
| B. | Heterotrophs |
| C. | Chemotrophs |
| D. | None of these |
| Answer» B. Heterotrophs | |
| 8560. |
Pyramid of energy is [BVP 2000] |
| A. | Upright |
| B. | Inverted |
| C. | Oblique |
| D. | None of these |
| Answer» B. Inverted | |
| 8561. |
Food chain consists of [MP PMT 2000, 03] |
| A. | Producer, consumer and decomposer |
| B. | Producer, carnivore and decomposer |
| C. | Producer and primary consumer |
| D. | Producer, herbivore and carnivore |
| Answer» B. Producer, carnivore and decomposer | |
| 8562. |
In ecological crisis, whom interference play important role |
| A. | Green plants |
| B. | Human |
| C. | Biotic and abiotic components |
| D. | None of these |
| Answer» C. Biotic and abiotic components | |
| 8563. |
The lentic ecosystem includes which of following water [KCET 2000] |
| A. | Rain |
| B. | Running |
| C. | Standing |
| D. | Gravitational |
| Answer» D. Gravitational | |
| 8564. |
Which of the following is source of energy to an ecosystem [MP PMT 2000] |
| A. | Solar energy |
| B. | Sugar stored |
| C. | Heat liberated during respiration |
| D. | ATP |
| Answer» B. Sugar stored | |
| 8565. |
Tip of ecological pyramid is occupied by [MP PMT 1999; CBSE PMT 2001] |
| A. | Herbivores |
| B. | Carnivores |
| C. | Producers |
| D. | Decomposers |
| Answer» C. Producers | |
| 8566. |
The dominant second trophic level, in a lake ecosystem, is [BHU 1999] |
| A. | Benthos |
| B. | Plankton |
| C. | Zooplankton |
| D. | Phytoplankton |
| Answer» D. Phytoplankton | |
| 8567. |
In an aquatic ecosystem, maximum biomagnification is seen among the [CBSE PMT 1999] |
| A. | Fishes |
| B. | Phytoplanktons |
| C. | Zooplanktons |
| D. | Macroscopic plant |
| Answer» B. Phytoplanktons | |
| 8568. |
The relationship in an ecosystem can be depicted in [AIIMS 1998] |
| A. | Pyramid of energy |
| B. | Pyramid of biomass |
| C. | Pyramid of numbers |
| D. | All of these |
| Answer» E. | |
| 8569. |
The rate at which light energy is converted into chemical energy of organic molecules is the ecosystem's [CBSE PMT 1998; BHU 1999; Kerala CET 2003] |
| A. | Net primary productivity |
| B. | Gross secondary productivity |
| C. | Net secondary productivity |
| D. | Gross primary productivity |
| Answer» E. | |
| 8570. |
Detritus food chain starts from |
| A. | Dead organic matter |
| B. | Green plants |
| C. | Zooplanktons |
| D. | None of the above |
| Answer» B. Green plants | |
| 8571. |
Decomposers are [CPMT 1998; BHU 2001] |
| A. | Autotrophs |
| B. | Heterotrophs |
| C. | Autoheterotrophs |
| D. | Organotrophs |
| Answer» C. Autoheterotrophs | |
| 8572. |
Energy enters in ecosystem through [CPMT 1998] |
| A. | Herbivores |
| B. | Carnivores |
| C. | Producers |
| D. | Decomposers |
| Answer» D. Decomposers | |
| 8573. |
The green plants are removed from an aquarium [KCET 1998] |
| A. | The fishes will not survive |
| B. | Fishes will increase in size |
| C. | Fishes will decrease in size |
| D. | None of the above |
| Answer» B. Fishes will increase in size | |
| 8574. |
Energy transfer from one trophic level to other, in a food chain is [CBSE PMT 1999; BHU 2005] |
| A. | 0.01 |
| B. | 0.02 |
| C. | 0.1 |
| D. | 0.2 |
| Answer» D. 0.2 | |
| 8575. |
The zooplanktonic forms are [MP PMT 1999] |
| A. | Primary consumers |
| B. | Secondary consumers |
| C. | Carnivores |
| D. | Primary producers |
| Answer» B. Secondary consumers | |
| 8576. |
The snakes are included under [MP PMT 1999] |
| A. | Saprophytes |
| B. | Primary consumers |
| C. | Second trophic level |
| D. | None of these |
| Answer» E. | |
| 8577. |
The transfer or energy from organisms to organisms in a natural community establishes [MP PMT 1999] |
| A. | Food chains |
| B. | Biological control |
| C. | Natural barriers |
| D. | All the above |
| Answer» B. Biological control | |
| 8578. |
Food and energy relationships among living components of ecosystem is generally referred as |
| A. | Biocoenosis |
| B. | Microcosm |
| C. | Bioenergetic approach |
| D. | None of the above |
| Answer» D. None of the above | |
| 8579. |
Which of the following habitats is most unsuitable for primary productivity [MP PMT 1999] |
| A. | Meadow |
| B. | Forested river bank |
| C. | Cave |
| D. | Pond |
| Answer» D. Pond | |
| 8580. |
Ecosystem may be defined as [MP PMT 1999] |
| A. | Group of plants which act as the energy suppliers |
| B. | Group of organisms which form population |
| C. | Functional unit for ecological studies |
| D. | None of these |
| Answer» D. None of these | |
| 8581. |
The living organisms of all ecosystems collectively consitute [RPMT 1997] |
| A. | Producers |
| B. | Decomposers |
| C. | Consumers |
| D. | Biosphere |
| Answer» E. | |
| 8582. |
Which of the following ecosystems would be most stable [RPMT 1997] |
| A. | Man made forest |
| B. | Fresh water lake |
| C. | Saline lake |
| D. | Natural forest |
| Answer» E. | |
| 8583. |
Ecological pyramids are of [MP PMT 1997] |
| A. | Two types |
| B. | Three types |
| C. | Four types |
| D. | Five types |
| Answer» C. Four types | |
| 8584. |
In an ecosystem bacteria are considered as [MP PMT 1997] |
| A. | Microconsumers |
| B. | Macroconsumers |
| C. | Primary consumers |
| D. | Secondary consumers |
| Answer» B. Macroconsumers | |
| 8585. |
The food chain in which microbes split energy rich compounds of the producer community is [AIIMS 1999] |
| A. | Parasitic food chain |
| B. | Detritus food chain |
| C. | Predators food chain |
| D. | Producer food chain |
| Answer» C. Predators food chain | |
| 8586. |
Phosphorus usually becomes a limiting factor at certain times of the year in which ecosystem |
| A. | Aquatic ecosystem |
| B. | Grassland ecosystem |
| C. | Forest ecosystem |
| D. | All the above |
| Answer» B. Grassland ecosystem | |
| 8587. |
Which of the following ecosystem has the highest gross primary productivity [CBSE PMT 1997, 2004] |
| A. | Grassland |
| B. | Coral reef |
| C. | Mangroves |
| D. | Rain forest |
| Answer» C. Mangroves | |
| 8588. |
The correct path of energy flow in an ecosystem is [MP PMT 1995, 2002] |
| A. | Producers ® Carnivores ® Herbivores ® Decomposers |
| B. | Producers ® Herbivores ® Carnivores ® Decomposers |
| C. | Herbivores ® Carnivores ® Producers ® Decomposers |
| D. | Herbivores ® Producers ® Carnivores ® Decomposers |
| Answer» C. Herbivores ® Carnivores ® Producers ® Decomposers | |
| 8589. |
Food levels in an ecosystem are called [MP PMT 1996] |
| A. | Trophic levels |
| B. | Consumer levels |
| C. | Producer levels |
| D. | Herbivore levels |
| Answer» B. Consumer levels | |
| 8590. |
The first link in any food chain is always a green plant because [MP PMT 1996, 99] |
| A. | They are widely distributed |
| B. | They are firmly fixed to the soil |
| C. | They alone have a capacity to fix atmospheric in the presence of sunlight |
| D. | All of the above |
| Answer» D. All of the above | |
| 8591. |
If forest area is reduced to half, which one of the following will be a long term effect [CBSE PMT 1996] |
| A. | The natives (tribals) of that area will die on account of hunger |
| B. | Cattles of that area will die due to scarcity of fodder |
| C. | To diversity in germplasm will effect the crop breeding |
| D. | It will be converted into large desert |
| Answer» D. It will be converted into large desert | |
| 8592. |
In a food chain, which of the following produces in the largest amount [CBSE PMT 1996] |
| A. | Producers |
| B. | Decomposers |
| C. | Tertiary consumers |
| D. | Primary consumers |
| Answer» B. Decomposers | |
| 8593. |
In a pond ecosystem, benthos means [EAMCET 1995; BHU 2000, 01; AFMC 2001; MHCET 2003] |
| A. | Primary consumers in the depth of a pond |
| B. | Zooplankton on the water surface |
| C. | Periphyton |
| D. | Epineuston |
| Answer» B. Zooplankton on the water surface | |
| 8594. |
Which one statement is correct regarding man made ecosystem |
| A. | They are highly efficient |
| B. | They are poor in diversity |
| C. | They are vulnerable to drought, floods and diseases |
| D. | All are correct |
| Answer» E. | |
| 8595. |
In a food chain, lion is a [EAMCET 1995; MHCET 2003] |
| A. | Secondary consumer |
| B. | Primary consumer |
| C. | Tertiary consumer |
| D. | Secondary producer |
| Answer» D. Secondary producer | |
| 8596. |
We refer to the following as the food chain [KCET 1994] |
| A. | Large number of animals near a source of food |
| B. | Transfer of food energy from the green plants through a series of consumer organisms |
| C. | Large number of human beings forming a human chain near a source of food |
| D. | None of these |
| Answer» C. Large number of human beings forming a human chain near a source of food | |
| 8597. |
In an ecosystem, there is flow of energy at different trophic levels. This is as follows : [KCET 1994] |
| A. | Primary consumers - Tertiary consumers - Secondary consumers - Decomposers - Producers |
| B. | Producers - Primary consumers - Secondary consumers - Tertiary consumers - Decomposers |
| C. | Producers - Decomposers - Primary consumers - Tertiary consumers - Secondary consumers |
| D. | Producers - Primary consumers - Tertiary consumers - Secondary consumers - Decomposers |
| Answer» C. Producers - Decomposers - Primary consumers - Tertiary consumers - Secondary consumers | |
| 8598. |
The pyramid of energy in a forest ecosystem is [MP PMT 1994, 95, 97, 2002] |
| A. | Always upright |
| B. | Always inverted |
| C. | Both upright and inverted |
| D. | None of the above |
| Answer» B. Always inverted | |
| 8599. |
Which of the following does not effect the forest ecosystem [Bihar MDAT 1995] |
| A. | Deforestation |
| B. | Soil erosion |
| C. | Climatic variation |
| D. | None of these |
| Answer» E. | |
| 8600. |
In a biotic community, primary consumers are [CBSE PMT 1995; BVP 2001; MHCET 2001] |
| A. | Omnivores |
| B. | Carnivores |
| C. | Detritivores |
| D. | Herbivores |
| Answer» E. | |