MCQOPTIONS
Saved Bookmarks
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.
| 8651. |
Bacillus megatherium is used in |
| A. | Food poisoning |
| B. | Food processing |
| C. | Food manufacturing |
| D. | None of the above |
| Answer» C. Food manufacturing | |
| 8652. |
Human symbiotic bacteria help in |
| A. | Intake of meals |
| B. | Digestion of meals |
| C. | Excretion of digested meal |
| D. | None of the above |
| Answer» E. | |
| 8653. |
Which of the following red pigment is present in root nodules of bacteria |
| A. | Phycoerythrin |
| B. | Bacterio chlorophyll |
| C. | Leg haemoglobin |
| D. | Bacterio viridin |
| Answer» D. Bacterio viridin | |
| 8654. |
A free living anaerobic bacterium capable of \[{{N}_{2}}\] fixation in soil is [DPMT 1989, 93; CBSE PMT 1990; CMC Vellore 1993; RPMT 1995; MP PMT 1996] |
| A. | Rhizobium |
| B. | Azotobacter |
| C. | Streptococcus |
| D. | Clostridium |
| Answer» E. | |
| 8655. |
Tetanolysin is produced by |
| A. | Mycobacterium laprae |
| B. | Clostridium botulinum |
| C. | Clostridium tetani |
| D. | None of these |
| Answer» E. | |
| 8656. |
What is the cause of flavour of tea and tobacco leaves |
| A. | Mechanical method |
| B. | Different strains of bacteria |
| C. | Activity of fungi |
| D. | Action of viruses |
| Answer» E. | |
| 8657. |
Which of the following decompose the remanents of the plants into \[C{{O}_{2}}\] and water |
| A. | Algae |
| B. | Sunlight |
| C. | Virus |
| D. | Bacteria |
| Answer» C. Virus | |
| 8658. |
Which of the bacterium cause the fermentation of milk and other plant products |
| A. | Lactobacillus |
| B. | Hay bacillus |
| C. | Acetobacter |
| D. | Rhizobium |
| Answer» C. Acetobacter | |
| 8659. |
Bacteria which convert the nitrogen of the air to nitrogenous compounds are called [CPMT 1974] |
| A. | Nitrifying |
| B. | Nitrogen fixing |
| C. | Denitrifying |
| D. | Putrefying |
| Answer» B. Nitrogen fixing | |
| 8660. |
Retting of fibres is caused by [JIPMER 1987] |
| A. | Bacillus |
| B. | Clostridium |
| C. | Nitrobacter |
| D. | Rhizobium |
| Answer» C. Nitrobacter | |
| 8661. |
Clostridium is an example of [BHU 1984] |
| A. | Obligate aerobic nitrogen fixing bacteria |
| B. | Facultative nitrogen fixing bacteria |
| C. | Non nitrogen fixing bacteria |
| D. | Aerobic nitrogen fixing bacteria |
| Answer» B. Facultative nitrogen fixing bacteria | |
| 8662. |
Nitrifying bacteria, Nitrosomonas and Nitrobactor [AFMC 1981, 84; CPMT 1983, 86; BHU 1985] |
| A. | Convert (oxidise) ammonia or ammonium compounds into nitrates |
| B. | Convert nitrate into nitrogen |
| C. | Convert nitrogen into nitrates |
| D. | Convert carbon dioxide into carbohydrates |
| Answer» B. Convert nitrate into nitrogen | |
| 8663. |
Who defined ecology as the reciprocal relationship between organisms and their environments |
| A. | Misra |
| B. | Haeckel |
| C. | Odum |
| D. | Lamarck |
| Answer» C. Odum | |
| 8664. |
Who defined ecology as the study of form, function and factor |
| A. | Odum |
| B. | Climents |
| C. | Misra |
| D. | Haeckel |
| Answer» D. Haeckel | |
| 8665. |
Who defined ecology as the study of structure and function of nature |
| A. | Haeckel |
| B. | E.P. Odum |
| C. | R. Misra |
| D. | Taylor |
| Answer» C. R. Misra | |
| 8666. |
The species of plants that play a vital role in controlling the relative abundance of other species in a community are called [Kerala CET 2005] |
| A. | Edge species |
| B. | Link species |
| C. | Keystone species |
| D. | Pioneer species |
| E. | Successful species |
| Answer» D. Pioneer species | |
| 8667. |
Which of the following is correct [Orissa JEE 2005] |
| A. | 99% of existed species are extinct |
| B. | 25% of existed species are extinct |
| C. | 40% of existed species are extinct |
| D. | 30% of existed species are extinct |
| Answer» B. 25% of existed species are extinct | |
| 8668. |
The organisms spending most of the time in transitional area between two communities are called [HP PMT 2005] |
| A. | Exotic species |
| B. | Edge species |
| C. | Keystone species |
| D. | Critical link species |
| Answer» C. Keystone species | |
| 8669. |
Energy contents of macrophytes may be estimated by |
| A. | Calorimeter |
| B. | Energy measuring apparatus |
| C. | Oxygen bomb calorimeter |
| D. | None of the above |
| Answer» D. None of the above | |
| 8670. |
Habitat together with functions of species constitute its [CPMT 2005] |
| A. | Trophic level |
| B. | Boundary |
| C. | Topography |
| D. | Niche |
| Answer» E. | |
| 8671. |
Which one of the following correctly represents an organism and its ecological niche [AIIMS 2005] |
| A. | Vallisneria and pond |
| B. | Desert locust (Scistocerca) and desert |
| C. | Plant lice (aphids) and leaf |
| D. | Vultures and dense forest |
| Answer» D. Vultures and dense forest | |
| 8672. |
What is a keystone species [CBSE PMT 2004] |
| A. | A rare species that has minimal impact on the biomass and on other species in the community |
| B. | A dominant species that constitutes a large proportion of the biomass and which affects many other species |
| C. | A species which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the community's organization and survival |
| D. | A common species that has plenty of biomass, yet has a fairly low impact on the community's organization |
| Answer» D. A common species that has plenty of biomass, yet has a fairly low impact on the community's organization | |
| 8673. |
Name the term used to describe a single dominant species that dictates community structure [Kerala PMT 2004] |
| A. | Pioneer species |
| B. | Transitional species |
| C. | Key stone species |
| D. | Indigenous species |
| E. | Exogenous species |
| Answer» D. Indigenous species | |
| 8674. |
The ecological niche of population is a [MHCET 2003] |
| A. | Geographical area that it covers |
| B. | Place where it lives |
| C. | Set of conditions and resource it uses |
| D. | None of these |
| Answer» D. None of these | |
| 8675. |
Y-shaped energy flow model was given by |
| A. | H.T. Odum |
| B. | E.P. Odum |
| C. | Tensley |
| D. | Both a and b |
| Answer» E. | |
| 8676. |
'Exobiology' refers to the study of [BVP 2003] |
| A. | Exodermis |
| B. | Terrestrial organism |
| C. | Life in the air |
| D. | Life on other planets |
| Answer» E. | |
| 8677. |
Species are considered as [CBSE PMT 2003] |
| A. | Real units of classification devised by taxonomists |
| B. | Real basic units of classification |
| C. | The lowest units of classification |
| D. | Artificial concept of human mind which cannot be defined in abosolute terms |
| Answer» C. The lowest units of classification | |
| 8678. |
The light intensity can be measured by |
| A. | Sacchi disc |
| B. | Lux photometer |
| C. | Measuring disc |
| D. | None of these |
| Answer» C. Measuring disc | |
| 8679. |
Which of the following statements is true regarding individuals of same species [CBSE PMT 2002] |
| A. | They are interbreeding |
| B. | They live in same niche |
| C. | They live in different niche |
| D. | They live in different habitate |
| Answer» B. They live in same niche | |
| 8680. |
Study of environment and animals relation [CPMT 2002] |
| A. | Ecosystem |
| B. | Phytosociology |
| C. | Biotic community |
| D. | Ecology |
| Answer» E. | |
| 8681. |
Distribution of different plant geographically is called [AFMC 2002; DPMT 2004] |
| A. | Allopatric |
| B. | Sympatric |
| C. | Geopatric |
| D. | Sibling |
| Answer» B. Sympatric | |
| 8682. |
A community is defined as [CBSE PMT 2001] |
| A. | A group of birds |
| B. | A collection of species |
| C. | Interacting populations |
| D. | An interactive ecosystem |
| Answer» D. An interactive ecosystem | |
| 8683. |
Tetonic is the study of [MHCET 2001] |
| A. | Earthquakes |
| B. | Earth's crust |
| C. | Sand |
| D. | None of these |
| Answer» C. Sand | |
| 8684. |
The carrying capacity of a population is determined by its [BHU 2001] |
| A. | Birth rate |
| B. | Death rate |
| C. | Limiting resource |
| D. | Reproductive status |
| Answer» D. Reproductive status | |
| 8685. |
Number of endangered species of angiosperms in India is [KCET 2001] |
| A. | 487 |
| B. | 3000 |
| C. | 5000 |
| D. | 15000 |
| Answer» B. 3000 | |
| 8686. |
The term ecology was coined by [BHU 2001; AFMC 2004] |
| A. | Linnaeus |
| B. | William |
| C. | Odum |
| D. | Haeckel |
| Answer» B. William | |
| 8687. |
The term 'niche' of a species refers to [AFMC 1999] |
| A. | Specific and habitual function |
| B. | Specific place where an organism lives |
| C. | Competitive power of an organism |
| D. | Specific function of organism |
| Answer» C. Competitive power of an organism | |
| 8688. |
Population whose members reproduce asexually are termed |
| A. | Panimictic |
| B. | Amphimictic |
| C. | Apomictic |
| D. | Ecotype |
| Answer» D. Ecotype | |
| 8689. |
Name the famous plants ecologist [MP PMT 1998] |
| A. | Jagdish Chandra Bose |
| B. | Birbal Sahani |
| C. | Ramdeva Misra |
| D. | Charles Darwin |
| Answer» D. Charles Darwin | |
| 8690. |
Phytotron is a device by which [AIIMS 1998] |
| A. | Mutations are produced in plants |
| B. | Plants are grown in controlled environment |
| C. | Protons are liberated |
| D. | Leaf fall occurs on abscission layer |
| Answer» C. Protons are liberated | |
| 8691. |
The plants and animals living in a given area form [CPMT 1998; MP PMT 2002] |
| A. | Biological community |
| B. | Ecotone |
| C. | Biome |
| D. | Consociation |
| Answer» B. Ecotone | |
| 8692. |
Agrostology is related with the study of [RPMT 1997] |
| A. | Agricultural growth |
| B. | Epiphytes |
| C. | Grasses |
| D. | Nematode diseases |
| Answer» D. Nematode diseases | |
| 8693. |
Biogenetic law was putforward by [EAMCET 1993] |
| A. | E. Haeckel |
| B. | Charles Darwins |
| C. | Karl von Bear |
| D. | Lamarck |
| Answer» B. Charles Darwins | |
| 8694. |
The ecologically fixed and genetically irreversed species are called [CPMT 1999] |
| A. | Ecotone |
| B. | Ecological equivalents |
| C. | Ecotype |
| D. | None of these |
| Answer» B. Ecological equivalents | |
| 8695. |
Ecological factors which prevent a species from producing at its maximum rate is termed as [AMU 1990] |
| A. | Survival curve |
| B. | Ecological drift |
| C. | Environmental resistance |
| D. | None of these |
| Answer» D. None of these | |
| 8696. |
World environment day is celeberated on [MP PMT 1991; CPMT 2002; KCET 2004] |
| A. | 15th March |
| B. | 15th April |
| C. | 4th May |
| D. | 5th June |
| Answer» E. | |
| 8697. |
Ecology takes into account only [JIPMER 1989] |
| A. | Environmental factors only |
| B. | Plant adaptations only |
| C. | Effect of environment on plants |
| D. | All of the above |
| Answer» E. | |
| 8698. |
Paleo-ecology is referred as the study of |
| A. | Living organisms with environment |
| B. | Extinct organisms with their environment |
| C. | Herbivores with their environment |
| D. | None of these |
| Answer» C. Herbivores with their environment | |
| 8699. |
The term 'biocoenosis' was proposed by [MP PMT 1988, 2000; KCET 2001] |
| A. | Tansley |
| B. | Carl Mobious |
| C. | Warming |
| D. | None of the above |
| Answer» C. Warming | |
| 8700. |
Biotic potential refers to [AIIMS 1986] |
| A. | Increase of population under optimum conditions |
| B. | Increase of population under given conditions |
| C. | Increase of population under natural conditions |
| D. | Increase of population under climatic conditions |
| Answer» B. Increase of population under given conditions | |