MCQOPTIONS
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MCQOPTIONS
This section includes 38 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is not a type of organism in the food chain? |
| A. | Producer |
| B. | Cons |
| C. | Electrical Insulators Electrical Conductors Copper, gold Nickel, clay |
| D. | Decomposer |
| Answer» D. Decomposer | |
| 2. |
Directions: Fill in the blanks Desert ecosystems are located in regions that receive very less __(47)__ . Due to extremely high __(48)__, low water availability and intense __(49)__, fauna and flora are scarce and poorly developed. |
| A. | humidity |
| B. | air pressure |
| C. | A cell converts chemical energy to electrical energy. |
| D. | rainfall |
| Answer» E. | |
| 3. |
What are those plants and animals called that get their energy by eating other things? |
| A. | Producers |
| B. | Herbivores |
| C. | Copper |
| D. | Consumers |
| Answer» E. | |
| 4. |
Below are given the parts of a food chain. Which of the arrangements is in the correct order? |
| A. | Flower\[\to \] Caterpillar \[\to \] Bird |
| B. | Bird \[\to \] Caterpillar \[\to \] Flower |
| C. | Open Open Closed Closed |
| D. | Bird \[\to \] Flower \[\to \] Caterpillar |
| Answer» B. Bird \[\to \] Caterpillar \[\to \] Flower | |
| 5. |
The picture below shows a plant. In which type of ecosystem do you expect to find this? |
| A. | Grassland |
| B. | Desert |
| C. | All the statements are correct. |
| D. | Marine |
| Answer» C. All the statements are correct. | |
| 6. |
What does every food web begin with? |
| A. | Decomposers |
| B. | Air |
| C. | A, B and C only |
| D. | Nutrients |
| Answer» D. Nutrients | |
| 7. |
Largest ecosystem of the world are [AIIMS 1985; MHCET 2000] |
| A. | Grasslands |
| B. | Great lakes |
| C. | Oceans |
| D. | Forests |
| Answer» D. Forests | |
| 8. |
In a given ecosystem number of individuals in species remain more or less constant over a period of time. The constancy of number is maintained by |
| A. | Parasite |
| B. | Predators |
| C. | Man |
| D. | Available food |
| Answer» E. | |
| 9. |
If phytoplankton are destroyed in the sea, then [DPMT 1984] |
| A. | Algae will get more space to grow |
| B. | Primary consumers will grow luxuriently |
| C. | It will affect the food chain |
| D. | No effect will be seen |
| Answer» D. No effect will be seen | |
| 10. |
Snake generally belongs to [CPMT 1991] |
| A. | Saprophytes |
| B. | Primary consumer |
| C. | Second trophic level |
| D. | None of these |
| Answer» E. | |
| 11. |
Generally the food chain has how many trophic levels [MP PMT 1990, 2001, 02; BHU 2001] |
| A. | One |
| B. | Two |
| C. | Three or Four |
| D. | Three |
| Answer» D. Three | |
| 12. |
The pyramid of number in a grassland ecosystem is [MP PMT 1998; BHU 2002] |
| A. | Always erect |
| B. | Always inverted |
| C. | Either erect or inverted |
| D. | Irregular |
| Answer» B. Always inverted | |
| 13. |
First link in any food chain is a green plant because [RPMT 1985; CPMT 1985] |
| A. | Green plants can synthesize food |
| B. | They can eat everything |
| C. | Fixed at one place |
| D. | None of the above |
| Answer» B. They can eat everything | |
| 14. |
Green plants constitute [CPMT 1983, 84, 88; MP PMT 1999] |
| A. | First trophic level |
| B. | Second trophic level |
| C. | Third trophic level |
| D. | Complete food chain |
| Answer» B. Second trophic level | |
| 15. |
Which ecosystem does not show variations dependent upon geographic location and rainfall |
| A. | Marine ecosystem |
| B. | Fresh water ecosystem |
| C. | Desert ecosystem |
| D. | Tropical ecosystem |
| Answer» B. Fresh water ecosystem | |
| 16. |
Which of the following has the greatest amount of energy |
| A. | Insectivores |
| B. | Carnivores |
| C. | Herbivores |
| D. | Autotrophs |
| Answer» E. | |
| 17. |
Pyramid of number becomes partly inverted partly erect for |
| A. | Aquatic ecosystem |
| B. | Terrestrial ecosystem |
| C. | Tree ecosystem |
| D. | All the above |
| Answer» D. All the above | |
| 18. |
Micro-consumers are |
| A. | Primary consumers |
| B. | Secondary consumers |
| C. | Tertiary consumers |
| D. | Decomposers |
| Answer» E. | |
| 19. |
These belong to the catergory of primary consumers ... [KCET 2004] |
| A. | Snakes and frogs |
| B. | Water insects |
| C. | Eagle and snakes |
| D. | Insects and cattle |
| Answer» E. | |
| 20. |
In forest ecosystem, fungi is grouped as [CPMT 2003] |
| A. | Producer |
| B. | Consumer |
| C. | Secondary consumer |
| D. | Decomposer |
| Answer» E. | |
| 21. |
The maximum biomass of living diatoms to be found in [AIEEE 2003] |
| A. | Marine pelagic habitats |
| B. | Moist soil and swamps |
| C. | Deep coastmines |
| D. | Salt lakes |
| Answer» B. Moist soil and swamps | |
| 22. |
In food chain initial organisms are [MP PMT 2002] |
| A. | Top consumers |
| B. | Secondary consumers |
| C. | Primary consumers |
| D. | Photosynthates |
| Answer» E. | |
| 23. |
The above represents |
| A. | Food chain |
| B. | Food web |
| C. | A population |
| D. | Ecosystem |
| Answer» C. A population | |
| 24. |
Energy enters into the ecosystem through [CBSE PMT 2001; CPMT 2003] |
| A. | Herbivores |
| B. | Carnivores |
| C. | Producers |
| D. | Decomposers |
| Answer» D. Decomposers | |
| 25. |
The flora and fauna in lakes or ponds are [AIIMS 2000] |
| A. | Lentic biota |
| B. | Lotic biota |
| C. | Abiotic biota |
| D. | Field layer |
| Answer» B. Lotic biota | |
| 26. |
A rat feeding upon potato tuber is [KCET 1999] |
| A. | Producer |
| B. | Carnivore |
| C. | Decomposer |
| D. | Primary consumer |
| Answer» E. | |
| 27. |
Ecosystem is defined as [CPMT 1998] |
| A. | Relation between plants and animals |
| B. | Relation between biotic and physical components |
| C. | Relation between producers and decomposers |
| D. | None of these |
| Answer» C. Relation between producers and decomposers | |
| 28. |
In an ecosystem in abiotic components which of the following occur [MP PMT 1999] |
| A. | Flow of energy |
| B. | Cycling of materials |
| C. | Consumers |
| D. | Flow of energy and cycling of materials |
| Answer» E. | |
| 29. |
The number of individuals of a species in a particular ecosystem at a given time remains constant due to [MP PMT 1998] |
| A. | Man |
| B. | Parasites |
| C. | Predators |
| D. | Available food |
| Answer» D. Available food | |
| 30. |
A lake ecosystem is [MP PMT 1997] |
| A. | Artificial |
| B. | Abiotic |
| C. | Natural |
| D. | Hydrological |
| Answer» D. Hydrological | |
| 31. |
Biological equilibrium is found among the [MP PMT 1998; MHCET 2003] |
| A. | Producer plants |
| B. | Consumers and producers |
| C. | Decomposers |
| D. | Producers, consumers and decomposers |
| Answer» E. | |
| 32. |
Transfer of energy from one trophic level to other trophic level is according to the second law of thermodynamics. The efficiency of energy transfer from herbivorous to carnivorous is [CBSE PMT 1996; AIEEE 2004] |
| A. | 0.25 |
| B. | 0.5 |
| C. | 0.1 |
| D. | 0.05 |
| Answer» D. 0.05 | |
| 33. |
Which of the following is the most stable ecosystem [CBSE PMT 1995; BHU 2002; MP PMT 2000] |
| A. | Mountain |
| B. | Desert |
| C. | Forest |
| D. | Ocean |
| Answer» E. | |
| 34. |
In lake ecosystem, pyramid biomass is [MP PMT 1993; Bihar 2005] |
| A. | Upright |
| B. | Inverted |
| C. | Anything is possible |
| D. | None is correct |
| Answer» C. Anything is possible | |
| 35. |
Which group of living organisms given below is a link in food chain between green plants and hawk |
| A. | Grasshopper, frog and snake |
| B. | Grasshopper, rat and snake |
| C. | Millipedes, centipedes and sparrow |
| D. | Earthworm, hen and rat |
| Answer» B. Grasshopper, rat and snake | |
| 36. |
In ecosystem lithosphere is concerned with |
| A. | Gases |
| B. | Minerals |
| C. | Water |
| D. | All the above |
| Answer» C. Water | |
| 37. |
Which of the following word is related to Homo sapiens [MP PMT 1994] |
| A. | Herbivor |
| B. | Carnivor |
| C. | Autotroph |
| D. | Omnivor |
| Answer» E. | |
| 38. |
Which of the following ecosystems have more productivity in an unit area |
| A. | Grassland |
| B. | Marine ecosystem |
| C. | Pond ecosystem with algae |
| D. | Tree ecosystem |
| Answer» D. Tree ecosystem | |