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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.
| 14101. |
How much portion of the PAR is captured by the plants? |
| A. | 5-10% |
| B. | 7-10% |
| C. | 8-10% |
| D. | 2-10% |
| Answer» E. | |
| 14102. |
Phosphorus is a sedimentary nutrient. This means it: |
| A. | cycles very slowly. |
| B. | never enters the atmosphere. |
| C. | settles as sediment in the ocean. |
| D. | All of the above |
| Answer» E. | |
| 14103. |
Decomposition is largely an/a |
| A. | carbon - requiring process |
| B. | oxygen - requiring process |
| C. | nitrogen - requiring process |
| D. | sulphur - requiring process |
| Answer» C. nitrogen - requiring process | |
| 14104. |
Food chains differ from food webs in that: (i) food chains are single sequence of who eats whom in a community. (ii) food chains better represent the entire community. (iii) food webs represent the complex interaction among food chains. (iv) food chain is the flow of energy in a population. |
| A. | (i) and (iii) |
| B. | (i) and (iv) |
| C. | (i), (ii) and (iii) |
| D. | (i), (ii), (iii) and (iv) |
| Answer» B. (i) and (iv) | |
| 14105. |
A crocodile has just eaten a lamb. A plover accommodatingly picks the crocodile's teeth. By this act, the plover, in ecological terms, is a: |
| A. | Decomposer |
| B. | Primary consumer |
| C. | Secondary consumer |
| D. | Tertiary consumer |
| Answer» D. Tertiary consumer | |
| 14106. |
Tip of ecological pyramid is occupied by: |
| A. | Producers |
| B. | Herbivores |
| C. | Carnivores |
| D. | Omnivores |
| Answer» D. Omnivores | |
| 14107. |
Which type of pyramid shows best efficiency of ecosystem? |
| A. | Pyramid of number |
| B. | Pyramid of biomass |
| C. | Pyramid of volume |
| D. | Pyramid of energy |
| Answer» E. | |
| 14108. |
Pick up the correct food chain. |
| A. | Grass \[\to \]Chamelion \[\to \]Insect \[\to \]Bird |
| B. | Grass \[\to \]Fox \[\to \]Rabbit \[\to \]Bird |
| C. | Phytoplankton \[\to \]Zooplankton \[\to \]Fish |
| D. | Fallen leaves \[\to \]Bacteria \[\to \]Insect larvae |
| Answer» C. Phytoplankton \[\to \]Zooplankton \[\to \]Fish | |
| 14109. |
Which of the following statements is not a major concern about our altering of the carbon cycle? |
| A. | The Greenland and Antarctic ice caps are expected to melt if global warming continues. |
| B. | High-sulphur fuels are used by power plants because they are less expensive than low-sulphur fuels. |
| C. | The increase in atmospheric \[C{{O}_{2}}\]exceeds the ability of the oceans to absorb the increase. |
| D. | \[C{{O}_{2}}\]is a gas that traps infrared radiation. |
| Answer» C. The increase in atmospheric \[C{{O}_{2}}\]exceeds the ability of the oceans to absorb the increase. | |
| 14110. |
In an aquatic ecosystem, maximum biomagnification is seen among: |
| A. | Fishes |
| B. | Phytoplanktons |
| C. | Zooplanktons |
| D. | Macroscopic plant |
| Answer» B. Phytoplanktons | |
| 14111. |
Which of the following statement(s) is/are correct about biogeochemical cycle? (i) Gaseous exchanges of phosphorus between organism and environment are negligible. (ii) All biogeochemical cycles include both organisms and non-living components. (iii)Most elements remain longest in the living portion of their cycle. (iv) The chemical elements used by organisms in large quantities cycle back and forth between organisms and environment. |
| A. | (i) and (iii) |
| B. | (i), (ii) and (iv) |
| C. | (i), (ii) and (iii) |
| D. | All of these |
| Answer» C. (i), (ii) and (iii) | |
| 14112. |
Match column-I with column-II and select the correct answer using the codes given below. Column-I Column-II A. Primary succession I. Autotrophs B. Climax community II. Community that has completed succession C. Consumer III. Colonisation of a new environment D. Producer IV. Animal |
| A. | A-III; B-II; C-IV; D-I |
| B. | A-III; B-I; C-IV; D-II |
| C. | A-I; B-III; C-II; D-IV |
| D. | A-II; B-III; C-IV; D-I |
| Answer» B. A-III; B-I; C-IV; D-II | |
| 14113. |
Choose the incorrect statements regarding ecological pyramids. (i) The relationship between organisms at different trophic levels is expressed in terms of number, biomass and energy. (ii) Any calculations of energy content, biomass or number has to include one group of organism at that trophic level. (iii) In most ecosystems, all the pyramids of number, biomass and energy are upright. (iv) The pyramid of biomass in sea is generally inverted. (v) Pyramid of energy is always inverted and can never be upright. |
| A. | (i), (iii) and (iv) |
| B. | Only (i) |
| C. | (ii) and (v) |
| D. | (i) and (v) |
| Answer» D. (i) and (v) | |
| 14114. |
The amount of energy captured by photosynthesis, minus the amount lost as heat in respiration, is: |
| A. | Secondary productivity |
| B. | Consumption efficiency |
| C. | NPP |
| D. | Photosynthetic efficiency |
| Answer» D. Photosynthetic efficiency | |
| 14115. |
What will happen if decomposers are removed from the ecosystem? |
| A. | Energy cycle is stopped |
| B. | Mineral cycle is stopped |
| C. | Consumers cannot absorb solar energy |
| D. | Rate of decomposition of mineral increases |
| Answer» C. Consumers cannot absorb solar energy | |
| 14116. |
The zone of effective light penetration in oceanic biome is called as: |
| A. | Epipelagic zone |
| B. | Bathypelagic zone |
| C. | Abyssal zone |
| D. | Benthic zone |
| Answer» B. Bathypelagic zone | |
| 14117. |
A community which starts succession in a habitat is: |
| A. | Pioneer community |
| B. | Serai community |
| C. | Biotic community |
| D. | Ecosere |
| Answer» B. Serai community | |
| 14118. |
In which life zone of ocean, the producers in the food chains are rarely found? |
| A. | Littoral |
| B. | Limnetic |
| C. | Profundal |
| D. | Intertidal |
| Answer» D. Intertidal | |
| 14119. |
Which is not true regarding wetlands? |
| A. | Natural ground water recharging systems |
| B. | Used as pasture land |
| C. | Purify runoff water |
| D. | Act as sedimentation traps |
| Answer» C. Purify runoff water | |
| 14120. |
Given below is one of the types of ecological pyramids. This type represents: |
| A. | Pyramid of numbers in a grassland |
| B. | Pyramid of biomass in a fallow land |
| C. | Pyramid of biomass in a lake |
| D. | Energy pyramid in a spring |
| Answer» D. Energy pyramid in a spring | |
| 14121. |
Which of the following statement(s) is/are correct? (i) An important characteristic of all communities is that their composition and structure constantly change in response to the changing environmental conditions. (ii) The climax community remains stable as long as the environment remains changed. (iii) The entire sequence of communities that successively change in a given area are called sere(s). |
| A. | (i), (ii) and (iii) |
| B. | (i) and (ii) |
| C. | (ii) and (iii) |
| D. | (i) and (iii) |
| Answer» E. | |
| 14122. |
Which of the following is incorrect for a pyramid of productivity? |
| A. | Only about 10% of the energy in one trophic level is passed into the next level. |
| B. | Because of the loss of energy at each trophic level, most food chains are limited to three to five steps. |
| C. | The pyramid of productivity of some aquatic ecosystems is inverted because of the large zooplankton primary - consumer level. |
| D. | Eating grain-fed beef is an inefficient means of obtaining the energy trapped by photosynthesis. |
| Answer» D. Eating grain-fed beef is an inefficient means of obtaining the energy trapped by photosynthesis. | |
| 14123. |
The occupational address of a species is often called as its: |
| A. | Biome |
| B. | Niche |
| C. | Environment |
| D. | Habitat |
| Answer» C. Environment | |
| 14124. |
Which of the following features would be characteristic of oceans but not of freshwater ecosystems? |
| A. | Receives material from land mostly via ground water. |
| B. | Seasonal mixing of materials. |
| C. | Elements buried in bottom sediments for long periods of time. |
| D. | Bottom waters frequently lacking oxygen. |
| Answer» D. Bottom waters frequently lacking oxygen. | |
| 14125. |
A complex of several species and communities in various stages of succession maintained under similar climatic conditions is known as: |
| A. | Biome |
| B. | Environmental complex |
| C. | Biological spectrum |
| D. | Biological clocks |
| Answer» B. Environmental complex | |
| 14126. |
One way cycle is; |
| A. | \[C{{O}_{2}}\] cycle |
| B. | \[{{H}_{2}}O\] cycle |
| C. | Free energy cycle |
| D. | \[{{O}_{2}}\]cycle |
| Answer» D. \[{{O}_{2}}\]cycle | |
| 14127. |
Which of the following is not one of the three aspects studied in biogeochemical cycling? |
| A. | The nature and size of element reservoir. |
| B. | The rate of movement between reservoirs. |
| C. | How different biogeochemical cycles interact. |
| D. | How new species create their own biogeochemical cycles. |
| Answer» E. | |
| 14128. |
The term ecosystem was coined by: |
| A. | E.P. Odum |
| B. | A.G. Tansley |
| C. | E. Haeckel |
| D. | E. Warming |
| Answer» C. E. Haeckel | |
| 14129. |
Which among the following is likely to have the highest levels of DDT depositions in its body? |
| A. | Eel |
| B. | Crab |
| C. | Seagull |
| D. | Phytoplankton |
| Answer» D. Phytoplankton | |
| 14130. |
Which hypothesis regarding what limits food- chain length has the most support? |
| A. | Energy transfer hypothesis |
| B. | Stability hypothesis |
| C. | Environmental complexity hypothesis |
| D. | All of the above |
| Answer» D. All of the above | |
| 14131. |
A pasture of 40 hectares has a biomass of 40 kg/hectare, or roughly 1,000,000 calories of energy. Cattle grazing on this pasture are sold for beef. About how many calories of energy from the pasture reach human consumers of the beef? |
| A. | 10000 |
| B. | 1000 |
| C. | 100000 |
| D. | 1000000 |
| Answer» D. 1000000 | |
| 14132. |
The use of tobacco is originated in |
| A. | China |
| B. | America |
| C. | Russia |
| D. | Eastern India |
| Answer» C. Russia | |
| 14133. |
Which one is not involved in mental illness |
| A. | Hereditary factors |
| B. | Childhood experiences |
| C. | Changes in brain |
| D. | Rheumatic fever |
| Answer» E. | |
| 14134. |
In epilepsy, seizure is |
| A. | Warming cry |
| B. | Fit of convulsions |
| C. | Loss of consciousness |
| D. | All the above |
| Answer» D. All the above | |
| 14135. |
Worker Bees are: |
| A. | Fertile males |
| B. | Fertile females |
| C. | Sterile females |
| D. | Sterile males |
| Answer» D. Sterile males | |
| 14136. |
The larva of Bombyx mori is: |
| A. | Cocoon |
| B. | Nymph |
| C. | Caterpillar |
| D. | Trochophore |
| Answer» D. Trochophore | |
| 14137. |
Match column-I with column-II and select the correct answer using the codes given below. Column-I Column-II A. Hybrid variety I. X-ray B. Mutation II. Allowpolyploidy C. Pure line III. \[{{F}_{1}}\]generation D. Triticale IV. Selection in self pollinated crops V. Genetic engineering |
| A. | A-III; B-II; C-I; D-IV |
| B. | A-III; B-I; C-IV; D-II |
| C. | A-I; B-III; C -IV; D-II |
| D. | A-II; B-I; C-III; D-IV |
| Answer» C. A-I; B-III; C -IV; D-II | |
| 14138. |
In crop improvement programme, haploids are of great importance because they: |
| A. | are useful in studies on meiosis. |
| B. | require only about half the amount of chemical fertilisers as compare to diploids |
| C. | give homozygous lines following diploidisation. |
| D. | grow better under adverse conditions. |
| Answer» D. grow better under adverse conditions. | |
| 14139. |
Which one of the following statement is incorrect? |
| A. | Pectinase and cellulase dissolve the cell wall. |
| B. | Some cyanobacteria form symbiotic association with the fem Azolla. |
| C. | Regeneration of cell wall in somatic hybridisation is induced by PEG. |
| D. | Plants obtained through pollen culture are always haploids. |
| Answer» D. Plants obtained through pollen culture are always haploids. | |
| 14140. |
Following table shows the steps and the aims in the breeding of a new genetic variety of crop with few steps or aims marked as A, B, C and D. Identify correct explanation of A, B, C and D from the given option. Step Aim I. A To evaluate and selection as parents II. Pure line creation Collection of pre-existing genetic variability III. B To combine desired characters of different plants IV. Screening the superior C V. Release and Commercialisation D |
| A. | A-Germplasm collection, B-Cross hybridisation, C-To select and test the hybrid for desired character combination for success of breeding objective, D-Obtained hybrid is evaluated in the crop fields and is compared with local crop cultivar. |
| B. | A-Germplasm collection, B-Self pollination, C-To select and test the hybrid for de sired character combination for success of breeding objective, D-Obtained hybrid is evaluated in the crop fields and is compared with foreign crop cultivar. |
| C. | A-Mutation, B-Cross hybridisation, C-To select and test the hybrid for desired character combination for success of breeding objective, D-Obtained hybrid is evaluated in the crop fields and is compared with local crop cultivar. |
| D. | A-Self pollination, B-Germplasm collection, C-Mutation, D?Cross-hybridisation. |
| Answer» B. A-Germplasm collection, B-Self pollination, C-To select and test the hybrid for de sired character combination for success of breeding objective, D-Obtained hybrid is evaluated in the crop fields and is compared with foreign crop cultivar. | |
| 14141. |
Gelatin, a very important raw material for preparation of photographic emulsion, is a byproduct of: |
| A. | Chicken |
| B. | Forest |
| C. | Fish |
| D. | Cattle |
| Answer» E. | |
| 14142. |
Tussar silk is extracted from: |
| A. | Bombyx mori |
| B. | Apis indica |
| C. | Antheraea paphia |
| D. | Apis dorsata |
| Answer» D. Apis dorsata | |
| 14143. |
In India, which of the following species of honey bee is reared in artificial hives? |
| A. | Apis indica |
| B. | Apis dorsata |
| C. | Apis florae |
| D. | None of these |
| Answer» B. Apis dorsata | |
| 14144. |
Natural silk contains: |
| A. | Potassium |
| B. | Phosphorus |
| C. | Nitrogen |
| D. | Magnesium |
| Answer» D. Magnesium | |
| 14145. |
The tumor inducing capacity of Agrobacterium tumefaciens is located in large extra-chromosomal plasmids called: |
| A. | Riplasmid |
| B. | Lambda phage |
| C. | pBR 322 |
| D. | Ti plasmid |
| Answer» E. | |
| 14146. |
The scientific process by which crop plants are enriched with certain desirable nutrients is called: |
| A. | Crop protection |
| B. | Breeding |
| C. | Bio-fortification |
| D. | Bio-remediation |
| Answer» D. Bio-remediation | |
| 14147. |
Two bactena round to be very useful in genetic engineering experiment are: |
| A. | Nitrosomonas and Klebsiella |
| B. | Escherichia and Agrobacterium |
| C. | Nitrobacter and Azotobacter |
| D. | Rhizobium and Diplococcus |
| Answer» C. Nitrobacter and Azotobacter | |
| 14148. |
A man made allopolyploid cereal crop is: |
| A. | Hordeum vulgare |
| B. | Raphano brassica |
| C. | Triticale |
| D. | Zea mays |
| Answer» D. Zea mays | |
| 14149. |
Which of the following statement(s) is correct? (i) The maintenance of hives of honeybee, for the production is called apiculture (ii) A group of animals related by descent and similar in most characters are called a breed (iii) The agricultural practice of breeding and raising livestock is called animal husbandry. (iv) The ability of plant cells to regenerate into complete plant is called somaclonal variation. |
| A. | (i) and (ii) |
| B. | (ii) and (iii) |
| C. | (iii) and (iv) |
| D. | (i), (ii) and (iii) |
| Answer» E. | |
| 14150. |
Match column-I with column-II and select the correct answer using the codes given below. Column ?I Column-II A. Many people Have deficiencies as they cannot buy fruits & vegetables. I. Single cell Proteins B. Crops with higher vitamins, proteins and fats II. Micropropagation C. Growing microbes as the alternative source of proteins. III. Somaclones D. Capacity to generate plant from a single cell or explant. IV. Hidden hunger E. Production of thousand plants through tissue culture. V. Biofortification F. Genetically identical plants. VI. totipotency |
| A. | A-IV; B-V; C-VI; D-I; E-II; F-III |
| B. | A-IV; B-V; C-VI; D-I; E-III; F-II |
| C. | A-IV; B-V; C-I; D-VI; E-II; F-III |
| D. | A-VI; B-V; C-I; D-IV; E-II; F-III |
| Answer» D. A-VI; B-V; C-I; D-IV; E-II; F-III | |