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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1251. |
Which stage comes first in xerarch succession?A. MossB. ShrubC. LichenD. Annual herb |
| Answer» Correct Answer - C | |
| 1252. |
An orderly sequence of community development on an area is calledA. SuccessionB. CoverC. EstablishmentD. Diversity |
| Answer» Correct Answer - A | |
| 1253. |
The terminal stage of a successional process is calledA. Final stageB. Climax stageC. Seral stageD. Pioneer stage |
| Answer» Correct Answer - B | |
| 1254. |
Which is not a characteristic of sera stages?A. Simplified food chainB. Few and generalized nichesC. Low NPPD. Low energy use efficiency |
| Answer» Correct Answer - C | |
| 1255. |
In aquatic ecosystems, the limiting factor for the productivity is _________. |
| Answer» In aquatic ecosystems, the limiting factor for productivity is light. | |
| 1256. |
If the pioneer stage is dominated by autotrophs, then the succession is called.A. AllogenicB. AutogenicC. AutotrophicD. Heterotrophic |
| Answer» Correct Answer - C | |
| 1257. |
In an ecosystem dominated by trees, the pyramid (of numbers) is _________ type. |
| Answer» In an ecosystem dominated by trees, the pyramid (of numbers) is of inverted type. | |
| 1258. |
Plants are called as_________ because they fix carbon dioxide. |
| Answer» Plants are called as autotrophs because they fix carbon dioxide. | |
| 1259. |
In an ecosystem dominated by trees, the pyramid (of numbers) is____type.A. uprightB. spindle shapedC. InvertedD. none of the above |
| Answer» Correct Answer - C | |
| 1260. |
The ultimate energy source of all ecosystem isA. producersB. organic moleculesC. carbohydrateD. solar radiation. |
| Answer» Correct Answer - D | |
| 1261. |
Percentage of photosyntetically active radiation (PAR) that is captured by plants in synthesis of organic matter isA. 50-70%B. 30-40%C. 80-100%D. 2-10% |
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Answer» Correct Answer - D About 1-5 % of incident solar energy or 2-10 % of PAR is captured by the photosynthetic organisms for the synthesis of organic matter (Gross primary productivity). Roughly 20 % of it is consumed in respiration so that net capture of energy (net primary productivity) is 0.8-4 % of incident radiation or 1.6-8% of PAR. |
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| 1262. |
Plants are called as_____ because they fix carbon dioxide.A. heterotrophsB. autotrophsC. saprotrophsD. all of these |
| Answer» Correct Answer - B | |
| 1263. |
What percentage of photosynthetically active radiation is captured by plants? |
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Answer» 2 – 10% of photosynthetically active radiation is captured by plants. |
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| 1264. |
What do you mean by PAR? Mention its significance. |
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Answer» The amount of light available for photosynthesis of plants is called Photosynthetically Active Radiation (PAR) which is between the range of 400-700 mm wave length. |
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| 1265. |
Define Grey carbon and Black carbon. |
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Answer» Grey carbon – carbon stored in fossil fuel (coal, oil and biogas deposits in the lithosphere). Black carbon – carbon emitted from gas, diesel engine and coal fired power plants. |
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| 1266. |
Percentage of photosynthetically active radiation (PAR) in the incident solar radiation isA. 1-5%B. 2-10%C. less than 50%D. approx 100% |
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Answer» Correct Answer - C Less that 50 % of the solar energy incident over earth is PAR (photosynthetically active radiation). |
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| 1267. |
Percentage of photosynthetically active radiation (PAR) in the incident solar radiation isA. `50%`B. `100%`C. `1-5%`D. `2-10%` |
| Answer» Correct Answer - A | |
| 1268. |
What is the percentage of photosynthetically active radiation (PAR), in the incident solar radiation.A. 1B. 0.5C. 1-5%D. 2-10% |
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Answer» Correct Answer - B Out of total incident solar radiation, about fifty percent of it forms photosynthetically active radiation or PAR. |
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| 1269. |
Pointout the factors that affects the photosynthetically active radiation. |
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Answer» PAR is not always constant because of clouds, tree shades, air, dust particles, seasons, latitudes and length of the daylight availability. |
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| 1270. |
Photosynthetically Active Radiation ranges between the wavelength of. (a) 400 – 600 nm (b) 600 – 700 nm (c) 400 – 500 nm (d) 400 – 700 nm |
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Answer» (d) 400 – 700 nm |
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| 1271. |
Decomposers like fungi and bacteria areA. autotrophsB. heterotrophsC. saprotrophsD. chemo-autotrophs. |
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Answer» Correct Answer - C Decomposers like bacteria and fungi are heterotrophs because they are dependent on others for their food as they cannot make their own food. They are also sarprotrophs because they feed on dead and decaying organic matter. |
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| 1272. |
The given graphs shows the productivity of an aquatic ecosystem measured in terms of dissolved oxygen produced and consumed by green plants and photosynthetic algae where PS=photosynthesis and R=respiration. A. PS will be increase, R will be decreasedB. PS will be decreased, R will be increased.C. PS and R will not change.D. PS+R will increase. |
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Answer» Correct Answer - D During photosynthesis, green plants produce oxygen which leads to increase in dissolved oxygen in an aquatic ecosystem. Respiration uses oxygen and hence causes decrease in dissolved oxygen. The excess growth of planktonic algae that causes colouration of water is called algal bloom. The increased growth in photosynthetic algae will lead to more photosynthesis which will increase PS+ R ultimately. |
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| 1273. |
The region of sea having maximum productivity isA. coastalB. continental shelf water levelC. deep seaD. very deep sea |
| Answer» Correct Answer - B | |
| 1274. |
Which of the following is the correct sequence in the food chain?A. Grass`rarr` Wolf `rarr` Deer `rarr` BuffaloB. Grass `rarr` Snake `rarr` Insect `rarr` DeerC. Grass `rarr` Insect `rarr` Bird `rarr` SnakeD. Bacteria `rarr` Grass `rarr` Rabbit `rarr` Wolf |
| Answer» Correct Answer - C | |
| 1275. |
Interlocking of food chains results in:A. food linkB. food lockC. food webD. ecological pyramid |
| Answer» Correct Answer - C | |
| 1276. |
Percentage energy transferred to higher trophic level in food chain isA. `1%`B. `10%`C. `90%`D. `100%` |
| Answer» Correct Answer - B | |
| 1277. |
Which of the following food chains is correct?A. Grasses `rarr` Fox `rarr` RabbitB. Phytoplankton `rarr` Zooplankton `rarr` FishC. Grasses `rarr` Chameleon `rarr` Insects `rarr` BirdsD. Fallen leaves `rarr` Bacteria `rarr` Insect `rarr` Birds |
| Answer» Correct Answer - B | |
| 1278. |
The upright pyramid of number is absent inA. ForestB. LakeC. GrasslandD. Pond |
| Answer» Correct Answer - A | |
| 1279. |
Energy and nutrients enter a community through:A. producersB. herbivoresC. carnivoresD. decomposers |
| Answer» Correct Answer - A | |
| 1280. |
Energy and nutrients enter a community throughA. producerB. consumerC. scavengerD. detritivores |
| Answer» Correct Answer - A | |
| 1281. |
The animal species controlling the ecosystem functioning is known as:A. edge speciesB. pioneer speciesC. keystone speciesD. umbrella species |
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Answer» Correct Answer - C The animal species controlling theecosystem functioning is known as keystone species. These are that has a disproportionately large effect on its environment relative to its abundance. Such species are described as playing a critical role in maintaning the structure of an ecosystem community, affecting many other organisms in ecosystem and helping to determine the types and number of various other species in the community. |
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| 1282. |
____ is the rate of production of organic matter by consumers.A. Net productivityB. Secondary productivityC. Net primary productivityD. Gross primary productivity |
| Answer» Correct Answer - D | |
| 1283. |
At each trophic level of a food chain, the energy not used or passed along is given off as aA. matterB. free energyC. heatD. water |
| Answer» Correct Answer - C | |
| 1284. |
In a food chain, as we go from lower to higher trophic level, the energy:A. becomes doubled at each stepB. increases irregularlyC. remains constantD. decreases |
| Answer» Correct Answer - D | |
| 1285. |
The upright pyramid of number is absent inA. pondB. forestC. lakeD. grassland |
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Answer» Correct Answer - B Pyramid of number represents the number of individuals per unit area at various trophic levels. It is always upright in grassland, pond and lake ecosystems But in forest or single tree ecosystem, it is spindle - shaped and if parasitic food chain is considered, then it will be an inverted pyramid . |
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| 1286. |
Read the statement and select the correct terminology for the same: “Carrying away of inorganic compounds of soil by water”.(a) Eluviation (b) Fragmentation (c) Humification (d) Mineralisation |
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Answer» (a) Eluviation |
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| 1287. |
Energy and nutrients enter a community byA. sunB. producersC. microbesD. biogeochemical cycle |
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Answer» Correct Answer - B Energy and minerals enter a community through producers. It manufactures organic food from simple inorganic substances by fixing energy which is then passed to the heterotrophic components (consumers). |
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| 1288. |
Trophic level of food chain having greatest amount of energy isA. carnivoresB. herbivoresC. autotrophsD. omnivores |
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Answer» Correct Answer - C In an ecosystem all energy is provided by sun. Autotrophs (plants) use `1-3%` of sun light and store it in the form of food to the herbivores. So grestest amount of energy is present in autotrophs. |
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| 1289. |
Which of the following pairs of animals are correctly ranked in the ecosystem terminology ?A. Rabbit and wall lizard-herbivoresB. Cow and honeybee -ProducersC. Frog and head louse-CarnivoresD. Cat and frog -Secondary consumers |
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Answer» Correct Answer - D cat and frog are secondary consumers. |
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| 1290. |
Both hydrarch and xerarch successios leads toA. Medium water conditionsB. Excessive wet conditionC. Xeric conditionD. Highly dry conditions |
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Answer» Correct Answer - A Both hydrarch and xerarch successions lead to medium water conditions. |
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| 1291. |
During ecological succession:A. The estabilishment of a new biotic community is very fast in its primary phaseB. The numbers and types of animals remain constantC. The changes lead to a community that is in near equilibrium with ethe environment and is called pioneer commnityD. The gradual and predictable change in species composition occurs in a given area |
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Answer» Correct Answer - D During ecological succession there is a gradual and predictable change in species composition occurs in a given area. |
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| 1292. |
Natural reservoir of phosphorus isA. animal banesB. rockC. fossilsD. sea water |
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Answer» Correct Answer - B The natural reservoir of phosphorus is rock, which contains phosphorus in form of phosphates. Sea water animals bones and fossile are reservoir of carbon. |
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| 1293. |
Macth the following and select the correct option. (a) Earthworm (i) Pioneer species (b) Succession (ii) Detrivore (c) Ecosysem service (iii) Natality (d) Population growth (iv) PollinationA. `{:("(a)", "(b)", "(c)", "(d)"),("(i)", "(ii)", "(iii)", "(iv)"):}`B. `{:("(a)", "(b)", "(c)", "(d)"),("(iv)", "(i)", "(iii)", "(ii)"):}`C. `{:("(a)", "(b)", "(c)", "(d)"),("(iii)", "(ii)", "(iv)", "(i)"):}`D. `{:("(a)", "(b)", "(c)", "(d)"),("(ii)", "(i)", "(iv)", "(iii)"):}` |
| Answer» Correct Answer - D | |
| 1294. |
The first trophic level in an ecosystem consists of:A. primary producersB. primary consumersC. secondary producersD. secondary consumers |
| Answer» Correct Answer - A | |
| 1295. |
Which is correct for secondary succession ?A. It follows primary succession.B. It is similar but faster than primary successionC. It begins on bare rock.D. It occurs on deforested site. |
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Answer» Correct Answer - D `2^(@)` succession begins in areas where natural biotic communities have been destroyed . E.g.: Abandoned farm lands, Burned or cut forest (deforested site) and land that have been flooded. |
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| 1296. |
The mass of living material at a trophic level at a particular time is called:A. Net Primary productivityB. Standing cropC. Gross primary productivityD. Standing state |
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Answer» Correct Answer - B The mass of living material at a trophic level at a particular time is called standing crop. |
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| 1297. |
The mass of living material at a trophic level at a particular time is called:A. gross pimary productivityB. standing stateC. net primary productivityD. standing crop |
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Answer» Correct Answer - D The total dried biomass of living organisms present at a trophic level at a particular time is known as standing crop. Standing state is the amount of inorganic nutrients present at any time in the soil or water of ecosystem. The gross primary productivity is the total organic matter synthesised by producers during photosynthesis per unit time and area. |
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| 1298. |
Natural reservoir of phosphorus is:A. Sea waterB. Animal bonesC. RockD. Fossils |
| Answer» Correct Answer - C | |
| 1299. |
Which occupies more than one trophic level in the same ecosystem at the same time ?A. SparrowB. GoatC. FrogD. Lion |
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Answer» Correct Answer - A In a pond ecosystem , fish occupy more than one trophic level. Man and sparrow occupy more than one trophic level in ecosystem. |
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| 1300. |
The mass of living material at a trophic level at a particular time is calledA. standing stateB. Net primary productivityC. standing cropD. gross primary productivity |
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Answer» Correct Answer - C (a) Standing state - The amount of inorganic nutrients present any time in soil/water of the ecosystem. (b) Net primary productivity - It is the total organic matter stored by producers per unit area/volume per unit time. (c ) Standing crop - It is the amount of living biomass in an ecosystem. (d) Gross primary productivity - It is the total organic matter synthesized by the producers in the process of photosynthesis per unit per unit time. |
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