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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.
| 8451. |
In coconut, black covering (thin layer) adherent to the kernel around the endosperm is [MP PMT 1987] |
| A. | Mesocarp |
| B. | Endocarp |
| C. | Seed coat |
| D. | None of these |
| Answer» D. None of these | |
| 8452. |
Morphologically the white fluffy edible mass in maize is |
| A. | Seed coat |
| B. | Seed |
| C. | Endosperm |
| D. | Pericarp |
| Answer» D. Pericarp | |
| 8453. |
The phytoplankton in the ponds act as [DPMT 1992] |
| A. | Producers |
| B. | Decomposers |
| C. | Consumers |
| D. | Organic compounds |
| Answer» B. Decomposers | |
| 8454. |
The pyramid of number is based on [CBSE PMT 1993] |
| A. | Unit per area |
| B. | Food per individual |
| C. | Individuals in trophic level |
| D. | None of these |
| Answer» D. None of these | |
| 8455. |
What is maximum in a pond-ecosystem [RPMT 1992] |
| A. | Primary consumers |
| B. | Secondary consumers |
| C. | Producers |
| D. | Decomposers |
| Answer» D. Decomposers | |
| 8456. |
Ecosystem is [CPMT 1991; MP PMT 2002; Orissa JEE 2005] |
| A. | Open |
| B. | Closed |
| C. | Both open and close |
| D. | Neither open nor closed |
| Answer» B. Closed | |
| 8457. |
Energy storage at consumer level is called [MP PMT 1990; 2001] |
| A. | Gross primary productivity |
| B. | Secondary productivity |
| C. | Net primary productivity |
| D. | Net productivity |
| Answer» C. Net primary productivity | |
| 8458. |
In a tree ecosystem, the pyramid of number is [CPMT 1983; RPMT 1997] |
| A. | Upright |
| B. | Inverted |
| C. | Both of the above |
| D. | None of the above |
| Answer» D. None of the above | |
| 8459. |
Biological equilibrium is an equilibrium among the [CPMT 1981, 84, 85;MP PMT 1984] |
| A. | Producers |
| B. | Producers and consumers |
| C. | Decomposers and producers |
| D. | Producers, consumers and decomposers |
| Answer» E. | |
| 8460. |
In a food chain of grassland ecosystem, the top consumers are [NCERT 1979] |
| A. | Carnivores |
| B. | Herbivores |
| C. | Either carnivores or herbivores |
| D. | Bacteria |
| Answer» B. Herbivores | |
| 8461. |
In a food chain herbivores are [CPMT 1984; MHCET 2001; BVP 2001] |
| A. | Primary producers |
| B. | Primary consumers |
| C. | Secondary consumers |
| D. | Decomposers |
| Answer» C. Secondary consumers | |
| 8462. |
Trophic levels are formed by [CPMT 1980, 2000; BHU 1984] |
| A. | Organisms linked in food chain |
| B. | Only plants |
| C. | Only animals |
| D. | Only carnivores |
| Answer» B. Only plants | |
| 8463. |
The word ??ecosystem?? was first coined by [CPMT 1989, 2002; 1995; MP PMT 1997, 2001; BHU 2002] |
| A. | Weaver and Clements |
| B. | A.G. Tansley |
| C. | E.P. Odum |
| D. | By all the above |
| Answer» C. E.P. Odum | |
| 8464. |
An ecosystem must have continuous external source of [NCERT 1982] |
| A. | Food |
| B. | Minerals |
| C. | Energy |
| D. | All of the above |
| Answer» D. All of the above | |
| 8465. |
With regard to ecological food chain, man is a [CPMT 1980] |
| A. | Producer |
| B. | Consumer |
| C. | Both producer and consumer |
| D. | Producer and decomposer |
| Answer» C. Both producer and consumer | |
| 8466. |
The transfer of energy from organism to organism in a natural community establishes [CPMT 1988] |
| A. | Food chains |
| B. | Biological control |
| C. | Natural barriers |
| D. | All the above |
| Answer» B. Biological control | |
| 8467. |
The total energy fixed by a gram plant (Cicer arietinum) in an ecosystem on the whole is called [CPMT 1991] |
| A. | Primary production |
| B. | Gross production |
| C. | Secondary production |
| D. | None of the above |
| Answer» C. Secondary production | |
| 8468. |
Driving force of an ecosystem is [CPMT 1991] |
| A. | Producer |
| B. | Carbohydrates in plants |
| C. | Biomass |
| D. | Solar energy |
| Answer» E. | |
| 8469. |
Which of the cycle is concerned with energy flow in the ecosystem |
| A. | Food cycle |
| B. | cycle |
| C. | cycle |
| D. | All the above |
| Answer» B. cycle | |
| 8470. |
Flow of energy declines from low to higher trophic level in ecosystem, is mainly explained by [CPMT 1991; MP PMT 1999] |
| A. | First law of thermodynamics |
| B. | Second law of thermodynamics |
| C. | Both of these |
| D. | None of the above |
| Answer» C. Both of these | |
| 8471. |
In an ecosystem decomposer include [CPMT 1991] |
| A. | Bacteria and fungi |
| B. | Only microscopic organisms |
| C. | Above two |
| D. | Above two plus macro-organisms |
| Answer» D. Above two plus macro-organisms | |
| 8472. |
The pyramid that cannot be inverted in a stable ecosystem, is pyramid of [CPMT 1991, 99, 2001, 02; MP PMT 2001, 02; KCET 2000; HP PMT 2005; Orissa JEE 2005] |
| A. | Number |
| B. | Energy |
| C. | Biomass |
| D. | All the above |
| Answer» C. Biomass | |
| 8473. |
The maximum biological magnification of DDT through food web is seen in [MP PMT 1992] |
| A. | Algae |
| B. | Bacteria |
| C. | Higher plants |
| D. | Man |
| Answer» E. | |
| 8474. |
In an ecosystem which of the following are important components [MP PMT 1992] |
| A. | Energy flow and food chain |
| B. | Mineral recycling and energy flow |
| C. | Food chain and decomposers |
| D. | All the above |
| Answer» E. | |
| 8475. |
Which is the correct sequence in the food chain in a grassland [MP PMT 1990; AFMC 1999; Pb. PMT 2004; HP PMT 2005] |
| A. | Grass ® wolf ® deer ® buffalo |
| B. | Bacteria ® grass ® rabbit ® wolf |
| C. | Grass ® insect ® birds ® snakes |
| D. | Grass ® snake ® insect ® deer |
| Answer» D. Grass ® snake ® insect ® deer | |
| 8476. |
Cyberviatic is associated with [Pb. PMT 1999; RPMT 1999] |
| A. | Flow of energy |
| B. | Cycle of energy |
| C. | Energy released |
| D. | Study of energy |
| Answer» B. Cycle of energy | |
| 8477. |
What is studied under the ??microcosm?? |
| A. | Ecosystem |
| B. | Livings |
| C. | Non-livings |
| D. | None of the above |
| Answer» B. Livings | |
| 8478. |
Which of the following acts as 'nature's scavengers' [CBSE PMT 1997] |
| A. | Man |
| B. | Animals |
| C. | Insects |
| D. | Micro-organisms |
| Answer» E. | |
| 8479. |
On the global basis the maximum productivity is shown by [MP PMT 1988; CPMT 2000] |
| A. | Aquatic ecosystem |
| B. | Grasslands |
| C. | Forests |
| D. | Deserts |
| Answer» B. Grasslands | |
| 8480. |
An ecosystem resist change because it is in a state of [MP PMT 1987] |
| A. | Imbalance |
| B. | Homeostasis |
| C. | Shortage of components |
| D. | Deficiency of light |
| Answer» C. Shortage of components | |
| 8481. |
Which one of the following components of ecosystem comes from outside [MP PMT 1987] |
| A. | Oxygen |
| B. | Temperature |
| C. | Insects |
| D. | Energy |
| Answer» E. | |
| 8482. |
Nepenthes is a [CPMT 1986, 90, 93; MP PMT 1995; BVP 2002] |
| A. | Primary producer |
| B. | Consumer |
| C. | Primary producer and consumer |
| D. | None of the above |
| Answer» D. None of the above | |
| 8483. |
The number of primary producer within a specified area would be maximum in [RPMT 1985; CPMT 1976; MP PMT 1995] |
| A. | Pond ecosystem |
| B. | Grassland |
| C. | Desert |
| D. | Forest ecosystem |
| Answer» B. Grassland | |
| 8484. |
Eutrophic lakes means [DPMT 1984] |
| A. | Lake poor in nutrients |
| B. | Lake rich in nutrients |
| C. | Lake poor in flora and fauna |
| D. | Lake lacking in water |
| Answer» C. Lake poor in flora and fauna | |
| 8485. |
An ecosystem is a complex interacting system of [JIPMER 1984; MP PMT 1984; AMU 1987] |
| A. | Individual |
| B. | Population |
| C. | Communities and their physical environment |
| D. | Communities and their soil conditions |
| Answer» D. Communities and their soil conditions | |
| 8486. |
A wolf has just eaten a lamb when tiger saw the wolf attacked it and consumed it. The tiger is in ecological terms [CPMT 1982] |
| A. | A producer |
| B. | A primary consumer |
| C. | A secondary consumer |
| D. | A tertiary consumer |
| Answer» E. | |
| 8487. |
Maximum solar energy may be trapped by [BHU 1978] |
| A. | Growing grasses |
| B. | Planting trees |
| C. | Growing algae in large water bodies |
| D. | More cultivation of crop plants |
| Answer» D. More cultivation of crop plants | |
| 8488. |
If all the plants of the world die all the animals will also die due to shortage of [CPMT 1975, 78; AFMC 1989] |
| A. | Cold air |
| B. | Oxygen |
| C. | Food |
| D. | Timber |
| Answer» D. Timber | |
| 8489. |
In food web hyaenas and vultures are |
| A. | Primary consumers |
| B. | Predators |
| C. | Scavengers |
| D. | Decomposers |
| Answer» D. Decomposers | |
| 8490. |
Standing state of the ecosystem is |
| A. | Living and non-living components |
| B. | Only living components |
| C. | Total weight of non-living components |
| D. | None of the above |
| Answer» D. None of the above | |
| 8491. |
Which one of the following contains very low concentrations of dissolved inorganic nutrients for algal growth |
| A. | Oligotrophic lake |
| B. | Eutrophic lake |
| C. | Mesotrophic lake |
| D. | Both eutrophic and mesotrophic lakes |
| Answer» B. Eutrophic lake | |
| 8492. |
The planktonic forms are |
| A. | Autotrophs |
| B. | Heterotrophs |
| C. | Chemotrophs |
| D. | Insectivorous types |
| Answer» B. Heterotrophs | |
| 8493. |
Which of the following are consumers of second order |
| A. | Herbivores |
| B. | Carnivores |
| C. | Top carnivores |
| D. | None of the above |
| Answer» C. Top carnivores | |
| 8494. |
In an ecosystem energy flows in |
| A. | One direction |
| B. | Two direction |
| C. | Four direction |
| D. | All directions |
| Answer» B. Two direction | |
| 8495. |
The second order consumer in a food chain is |
| A. | Cattle |
| B. | Deer |
| C. | Tiger |
| D. | Goat |
| Answer» D. Goat | |
| 8496. |
Which one of the following ecosystems is more productive in terms of carbon dioxide fixation |
| A. | Crop ecosystem |
| B. | Forest ecosystem |
| C. | Aquatic ecosystem |
| D. | Hot spring ecosystem |
| Answer» D. Hot spring ecosystem | |
| 8497. |
Which one of the following system constitutes the primary producers |
| A. | Higher plants |
| B. | Algal phytoplanktons |
| C. | Bryophytes |
| D. | All the above |
| Answer» E. | |
| 8498. |
The total rate of photosynthesis including the organic matter used up in respiration during definite period is known as |
| A. | Gross primary productivity |
| B. | Net primary productivity |
| C. | Secondary productivity |
| D. | None of above |
| Answer» B. Net primary productivity | |
| 8499. |
Osmotrophs are also called as |
| A. | Producers |
| B. | Consumers |
| C. | Autotrophs |
| D. | Decomposers |
| Answer» E. | |
| 8500. |
Herbivores are called |
| A. | Primary consumers |
| B. | Secondary producers |
| C. | Key industry animals |
| D. | All the above |
| Answer» E. | |