MCQOPTIONS
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MCQOPTIONS
This section includes 639 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 551. |
What is called for the process when older communities of plants and animals are replaced by newer communities? |
| A. | Evolution |
| B. | Deforestation |
| C. | Forestation |
| D. | Ecological succession |
| Answer» E. | |
| 552. |
Zooplanktons are small organisms that graze on the |
| A. | Herbivores |
| B. | Phytoplankton |
| C. | Carnivores |
| D. | Omnivores |
| Answer» C. Carnivores | |
| 553. |
Without oceans, earth will be like |
| A. | Mars |
| B. | Jupiter |
| C. | Mercury |
| D. | Neptune |
| Answer» B. Jupiter | |
| 554. |
Who first gave concept of biosphere? |
| A. | Jabir bin ayan |
| B. | Augustine |
| C. | Edward Suess |
| D. | Edwin |
| Answer» D. Edwin | |
| 555. |
Which ecosystem is very important for man to produce food and fiber? |
| A. | Man subsidized solar power ecosystem |
| B. | Unsubsidized natural solar powered ecosystem |
| C. | Naturally subsidized solar powered ecosystem |
| D. | Fuel power ecosystem |
| Answer» B. Unsubsidized natural solar powered ecosystem | |
| 556. |
What are the advance technologies used for fishing? |
| A. | Radar |
| B. | Sonar |
| C. | Both a and b |
| D. | None of these |
| Answer» D. None of these | |
| 557. |
Why detritivores are considered at the zero level in the food web? |
| A. | Because it eats only producers |
| B. | Because it eats only consumers |
| C. | Because it eats producers as well as consumers |
| D. | Because it do not eat producers as well as consumers |
| Answer» D. Because it do not eat producers as well as consumers | |
| 558. |
What is concentration of O₂ in atmosphere? |
| A. | 0.12 |
| B. | 0.209 |
| C. | 0.21 |
| D. | 0.22 |
| Answer» C. 0.21 | |
| 559. |
Which type of forest is widely used for outdoor recreation? |
| A. | Natural forests |
| B. | Private forests |
| C. | Dead forests |
| D. | Grassland forests |
| Answer» C. Dead forests | |
| 560. |
How many grams of air in a liter ? |
| A. | 1.5 gm |
| B. | 1.3gm |
| C. | 1.2gm |
| D. | 7gm |
| Answer» C. 1.2gm | |
| 561. |
What does an ecosystems depend on ? |
| A. | Solar Energy |
| B. | Consumers |
| C. | Producers |
| D. | Food chain |
| Answer» B. Consumers | |
| 562. |
Biotic community along with its physical factors is known as |
| A. | Ecosystem |
| B. | Biosphere |
| C. | Hydrosphere |
| D. | Biome |
| Answer» B. Biosphere | |
| 563. |
Which ecosystem produce the highest annual net primary productivity? |
| A. | Tropical evergreen forest |
| B. | Tropical rain forest |
| C. | Tropical deciduous forest |
| D. | Temperate evergreen forest |
| Answer» C. Tropical deciduous forest | |
| 564. |
What flows through the ecosystem while matter cycles within them? |
| A. | Energy |
| B. | Force |
| C. | Pressure |
| D. | Wind |
| Answer» B. Force | |
| 565. |
Which type of ecosystem accounts for most of the net primary productivity on earth even though it has a low average net primary productivity? |
| A. | Tropical rain forest |
| B. | Desert |
| C. | Tropical evergreen forest |
| D. | Oceans |
| Answer» E. | |
| 566. |
Total primary production in an ecosystem is known as____________________ |
| A. | Gross final production |
| B. | Gross primary production |
| C. | Gross middle production |
| D. | Net primary production |
| Answer» C. Gross middle production | |
| 567. |
In ecosystem standing crop refers to________________ |
| A. | All the green plants |
| B. | All the non living materials |
| C. | All living and dead animals |
| D. | All the living materials both animals and plants |
| Answer» E. | |
| 568. |
The dominant second tropic level in a lake ecosystem is_____________________ |
| A. | Phytoplankton |
| B. | Zooplankton |
| C. | Plankton |
| D. | Benthos |
| Answer» C. Plankton | |
| 569. |
Generally ecosystem consists of how many basic components? |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» C. Three | |
| 570. |
The three functional components interact with each other to form__________________ |
| A. | Environmental succession |
| B. | Environmental depression |
| C. | Environmental system |
| D. | Ecology |
| Answer» D. Ecology | |
| 571. |
Green plants are the most important organisms for an ecosystem. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 572. |
Consumer for food that feeds on producers are known as_____________________ |
| A. | Carnivores |
| B. | Consumers |
| C. | Herbivores |
| D. | Producers |
| Answer» D. Producers | |
| 573. |
What are examples of man subsidized solar powered ecosystem? |
| A. | Coastal estuary, tropical rain forest |
| B. | Agriculture and Aquaculture |
| C. | Oceans |
| D. | Tropical Rain forest |
| Answer» C. Oceans | |
| 574. |
Which consumers do not rely directly on green plants? |
| A. | Herbivores |
| B. | Carnivores |
| C. | Secondary Consumers |
| D. | Primary Producers |
| Answer» D. Primary Producers | |
| 575. |
How many oceans constitute the marine ecosystems around peninsular India? |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» D. Four | |
| 576. |
The marine life has been exploited by |
| A. | Humans |
| B. | Animals |
| C. | Pollution |
| D. | All of these |
| Answer» B. Animals | |
| 577. |
What is role of an acosystem ? |
| A. | providing nutritional support to plants |
| B. | to generate life continuity, flourishing distinctive structure to all species |
| C. | helping animals to survive in an environment |
| D. | All of above |
| Answer» C. helping animals to survive in an environment | |
| 578. |
Which ecosystem are the grazing areas of many rural communities? |
| A. | Tropical evergreen |
| B. | Tropical deciduous |
| C. | Grassland |
| D. | Desert |
| Answer» D. Desert | |
| 579. |
What is percentages of N₂ in atmosphere? |
| A. | 0.7808 |
| B. | 0.77 |
| C. | 0.79 |
| D. | 0.8 |
| Answer» B. 0.77 | |
| 580. |
Oceans exerts a great influence of the planets |
| A. | Weather |
| B. | Climate |
| C. | Precipitation |
| D. | Weather and Climate |
| Answer» E. | |
| 581. |
Which producers use energy stored in chemical bond? |
| A. | Herbivores |
| B. | Sulphur oxidizing bacteria |
| C. | Saprotrophs |
| D. | Heterotrophs |
| Answer» C. Saprotrophs | |
| 582. |
Which is the biggest desert in the world including both hot and cold deserts? |
| A. | Sahara |
| B. | Arctic |
| C. | Arabian |
| D. | Antarctica |
| Answer» E. | |
| 583. |
Where we can find tracts of tall elephant grass? |
| A. | Terai belt |
| B. | Deccan belt |
| C. | Himalayan pasture belt |
| D. | Gangs belt |
| Answer» B. Deccan belt | |
| 584. |
Which pesticide is used to get rid of malaria? |
| A. | Insecticides |
| B. | DDT |
| C. | Fungicides |
| D. | Herbicides |
| Answer» C. Fungicides | |
| 585. |
Which of the following factor diminishing as food chain proceeds? |
| A. | Pressure |
| B. | Energy |
| C. | Nutrition |
| D. | Temperature |
| Answer» C. Nutrition | |
| 586. |
A dependent, on producers for their food is called |
| A. | Autotrophic organisms |
| B. | Heterotrophs |
| C. | Primary producers |
| D. | Sulphur and carbon |
| Answer» C. Primary producers | |
| 587. |
What makes plant producers? |
| A. | Plants produce their own food |
| B. | Plants depend on other organisms for food |
| C. | Plants are decomposers |
| D. | Plants do not require any energy |
| Answer» B. Plants depend on other organisms for food | |
| 588. |
In Solar energy what works more efficiently when engines are hot? |
| A. | Photovoltaic cells |
| B. | Catalytic Converter |
| C. | Catalytic Cells |
| D. | Solar Plates |
| Answer» C. Catalytic Cells | |
| 589. |
Majority of meteriorites burn and disintegrate in |
| A. | Mesosphere |
| B. | Thermosphere |
| C. | Stratosphere |
| D. | Troposphere |
| Answer» B. Thermosphere | |
| 590. |
What is altitude of menopause? |
| A. | 80 km |
| B. | 45 km |
| C. | 50 km |
| D. | 90 km |
| Answer» B. 45 km | |
| 591. |
Beach is classified into which ecosystem? |
| A. | Lake ecosystem |
| B. | Seashore ecosystem |
| C. | Pond ecosystem |
| D. | River ecosystem |
| Answer» C. Pond ecosystem | |
| 592. |
What is called for a symbiotic relationship of fungus with an alga? |
| A. | Lichens |
| B. | Thallus |
| C. | Mycelium |
| D. | Funga |
| Answer» B. Thallus | |
| 593. |
What made organisms to build their ecosystem in quatic? |
| A. | Curiosity |
| B. | Evolution |
| C. | Force from other organisms |
| D. | Increase in water level |
| Answer» C. Force from other organisms | |
| 594. |
The producers within an underwater ecosystem are called as_____________________ |
| A. | Phytoplankton |
| B. | Autoplankton |
| C. | Hectoplankton |
| D. | Semiplankton |
| Answer» B. Autoplankton | |
| 595. |
Most types of algae are classified as producers. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 596. |
Autotrophic bacteria that produce food through chemosynthesis have also been found at places on the seafloor called_____________________ |
| A. | Cold seeps |
| B. | Hot seeps |
| C. | Coral seeps |
| D. | Warm seeps |
| Answer» B. Hot seeps | |
| 597. |
What does a primary consumer eat? |
| A. | Plants |
| B. | Decomposers |
| C. | Small animals |
| D. | Large animals |
| Answer» B. Decomposers | |
| 598. |
What is called for the symbiotic association between a fungus and the roots of a vascular plant? |
| A. | Thallus |
| B. | Mycelium |
| C. | Fungal mantle |
| D. | Mycorrhizae |
| Answer» E. | |
| 599. |
Gold can be decomposed. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 600. |
In order to form compost which of the following wastes cannot be decomposed by bacteria? |
| A. | Plant wastes |
| B. | Kitchen wastes |
| C. | Plastic and polythene wastes |
| D. | Bodies of dead animals |
| Answer» D. Bodies of dead animals | |