100 Agronomy One Liner Questions. 100 Agronomy One Liner Questions for Entry Test Preparation. 100 Agronomy One Liner Questions for M.Sc Students. 100 Agronomy One Liner Questions for Ph.D. students
| Statement | Answer |
|---|---|
| Poor plant productivity on the acid soils is due to the__________________ | Al toxicity Mn toxicity Excess of H ions (All of the given options) |
| Chlorophyll absorbs the light at the_______________ | 0.67 micrometer |
| Brady rhizobium is the……………….in nature. | Symbiotic |
| …………. bacteria are called to produce the vitamin B. | Azotobacter |
| Trichoderma is the_____________________ | Root pathogen |
| ………….are responsible for the converting fixed P into the available P. | AMF |
| ……………reactions are responsible for the developing brown color of the residues. | Oxidation and polymerization |
| Higher clay content will cause the_______________ | Lower mineralization |
| Excess of the N will………….the availability of the P. | Decrease |
| Sometimes increase and sometimes decrease the ………….uptake is less affected by the competition between the neighboring roots. | Phosphate |
| Concentration of the micronutrients (Fe, Cu, Mn, Zn) in the soil solution depends upon the________________ | Soil OM contents Soil pH Soil redox potential (All the three given options) |
| Under the submerged & flooded conditions, the whole system is the____________ | Reduced |
| Organic matter decomposition & mineralization decreases under the flooded conditions up to the_______________ | Twenty% |
| Phosphorous availability will………. under the flooded conditions. | Increases |
| The redox potential under the extreme flooded conditions goes up to the minus 300 mV due to the production of the___________ | Hydrogen sulphide |
| Under the flooded conditions, the micronutrient that protects system from going into the extreme negative state is the_____________ | Iron |
| Mechanism by which the nutrients are converted into the cellular components is known as______________ | Metabolism |
| Water erosion is known as……………… | Splash erosion |
| Maximum loss of the nutrients occurs in the………….. | Sheet erosion |
| ………… is the most serious form of the erosion | Gully erosion |
| If the vertical slope increases by the eight times, the K.E of run-off water will increase by the………………….. | Eight times |
| Addition of the silica…………………….. | Makes the soil loose |
| Crop residues can absorb the water…………. times more than the weight | None of the options is correct |
| The Waterlogging results in…………….. | Disappearance of oxygen |
| Oxygen deficient soil layer in characterized by the…………….. colour | Dark grey |
| Presence of the easily decomposable organic matter is an indication of the……………………. | Soil reduction |
| If the Alkali soil gets waterlogged, its PH…………………. | Falls |
| In the waterlogged soil, the uptake of the Zn is lowered due to the………………. | Its antagonistic interaction with p |
| ………………….are not liming the materials | Sulphur |
| If the quick results are required, is considered the best liming material ……………………………. | Slaked lime |
| Due to the more ABA, stomata…………….. | Are closed |
| ………………. is an organic nitrogen source | Proline |
| Under the favourable soil moisture conditions, genotypes with the ………………….transpiration efficiency produce | Low |
…………………….helps in the root proliferation. |
P |
| Antitranspirants is the………………… | Reflect light and decrease canopy temperature |
| Soils having the kaolinite clay show the…………. PH than having the montmorillonite. | Higher |
| In acidic the soils, manganese can occur the……………….. | Both in divalent or in soluble form |
| Deficiency of the…………….. is considered the real cause for the poor plant growth in the acidic soils. | P |
| In strongly acidic soil, the dominant form of the microorganisms is the…………………… | Fungi |
| Rice is the grouped as…………………… responsive crop towards the liming | Low |
| Under the normal conditions soils affect the yield through……………… primary factors. | Three |
| ………………..is mutually beneficial relationship between the plant roots and the bacteria. | Symbiosis |
| Assuming that all nitrogen applied as the fertilizer is used by the soybeans, then what is the source of the most of remaining nitrogen needed by the plants growing in this field________________? | The nitrogen released during the decomposition of dead organic matter. |
| Nitrogenase is destroyed by the___________________ | Oxygen |
| Nodulated legumes fixing the nitrogen, but then exposed to the mineral nitrogen from the soil & the fertilizer N will______________ | Reduce their biological nitrogen fixation activity in the proportion to the ability of the mineral N to meet the plants N requirements |
| The first detectable step in the interaction of the legumes and the soil rhizobium bacteria leading to the formation of the nodules on plant roots is_____________________ | Legume roots secrete flavoniods that, when detected by rhizobia, cause activation of rhizobia Nod genes |
| The primary function of the hemoglobin in the nodule cells containing the biological nitrogen fixing bacteroids______________ | To trap oxygen in the cell cytoplasm in order to protect the nitrogenase enzyme in the bacteroid from toxic amounts of oxygen. |
| A reasonable amount of the nitrogen fixation (kilogram ha-1 & lbs acre-1) annually for a highly active the legume system is the________________ | 300 |
| Root hairs originate the from the root_________________ | Epidermis. |
| The process of the de-nitrification is the________________ | Conversion of nitrates to nitrogen gas |
| Which of following does not lead to increase the fixed nitrogen________________? | Biomass burning |
| Which of following gases is the least important in the problem of the global warming____________________? | Hydrogen sulfide |
| Which is not the way in which Nitrogen is lost from ecosystem_______________? | Weathering of parent material |
| Primary Producers are called……………………… | Autotrophs |
| Which of following is not the process of the internally cycled nitrogen________________________? | Nitrogen demobilization |
| Nitrogenous compound more readily taken up by the microbes is the_____________________ | NH4 |
| The conversion from the ammonium to the nitrate is termed as___________________ | Nitrification |
| Which of following forms of the N cannot be directly used by the plants___________________? | N2 |
| What is inhibitor on the nitrogenase___________________? | Available O2 |
| The key enzyme in the process of the BNF________________________ | Nitrogenase |
| ……………are the special soil bacteria those responsible for the BNF with legumes. | Rhizobia |
| In rhizobia legume symbiosis, rhizobia provide the plant with the_________________ | Fixed Nitrogen |
| …………strains of the rhizobia should be selected for the inoculants | Superior |
| Most important factor affecting the amount of the BNF is_______________ | Number of rhizobia in the soil |
| Amount of the nitrogen left in soil by legumes for the subsequent crops depends on____________________ | Legume species |
| Entry of rhizobia to the root occurs by the formation of the____________________ | Infection thread |
| The shape and location of the Nodules are mostly determined by the_________________ | Host legume |
| BNF requires the biological energy from the__________________ | Host plant |
| Legume rhizobia symbiosis require the about kilograms of carbohydrates /kg of the N fixed________________ | 10 |
| Exchange of the plant sugars for the NH3 takes place in the______________ | Nodules |
| Young nodules that are effective are often the…………………….. in colour | Pink to red |
| ………………..form of the bacteria is known as bacteriod | Non motile |
| If the inoculant is not stored properly, the number of the rhizobia in the inoculant will_________________________ | Decline |
| Liquid & solid substance containing the living rhizobia is known as______________ | Inoculant |
| Rhizobia are the soil bacteria that can infect the………………………..of legumes for N fixation. | Root |
| Rhizobia require the temperature for the growth in the range of the………………………. | 25-30c |
| ……………………..is the most serious threat to the good quality inoculants. | Heating |
| …………………..is the poorest method of the seed inoculation.Lime pelleting can be the beneficial when the soils are highly……………………….. | Acidic |
| Rhizobia in the coated seeds die rapidly when legume seeds are planted in the……………………… | Hot and dry soil |
| Grains of the legumes are rich in the………………………. | Proteins |
| The nitrogen fixation ability of the nodule is referred to the …………………………………. | Effectiveness |
| The quality of the various inoculants can be tested by the……………………….. | Grow out tests |
| Urea Fertilizer contains the……………………..percent nitrogen. | 46 |
| Chlorophyll occurs in the………………… of the plant | Chloroplast |
| cell………………….increases the amount of the inoculant that will | Sticker |
| …………………..are the major nitrogen fixing crops. | Legumes |
| …………………….. is the ultimate source of the water. | Rainfall |
| Turgor is the important because it gives the………………………… to the cell | Shape |
| The upper limit of the available water is the…………………… | Field Capacity |
| The ability of the water to enter into the different reactions is known as ………………………… | Water activity |
| Developmental plasticity is the mechanism of the……………………… | Drought escape |
| If the stomata are closed the water use efficiency……………………. | Increases |
| The energy available in the system to perform the work is the……………………….. | Free energy |
| In the mature cells most of the water is present in the…………………….. | Vacuole |
| The water potential of the pure free water is the………………… | Maximum |
| The energy developed in the solution due to the presence of the solutes is……………………………. | Osmotic potential |
| ________________is the permanent climatic feature of the region. | Aridity |
| In Pakistan, more than the……………….million hectares area is subjected to the drought | 5 |
| The opening and the closing of the stomata is known as ……………… | Stomatal regulation |
| Hydrophytes have the ………………..root hair. | No |
