MCQOPTIONS
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MCQOPTIONS
This section includes 1777 Mcqs, each offering curated multiple-choice questions to sharpen your 9th Class knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
Which of the following processes represents X, Y and Z in the given cycle? |
| A. | X Y Z Respiration Photosynthesis Decomposition |
| B. | X Y Z Photosynthesis Respiration Decomposition |
| C. | X Y Z Decomposition Photosynthesis Respiration |
| D. | X Y Z Decomposition Respiration Photosynthesis |
| Answer» B. X Y Z Photosynthesis Respiration Decomposition | |
| 352. |
What would happen, if all the oxygen present in the environment is converted to ozone? |
| A. | We will be protected more. |
| B. | It will become poisonous and kill living forms. |
| C. | Ozone is not stable, hence it will be toxic. |
| D. | It will help harmful sun radiations to reach earth and damage many life forms. |
| E. | None of these |
| Answer» C. Ozone is not stable, hence it will be toxic. | |
| 353. |
Which of the following statements is true about the process shown below? |
| A. | It is caused by the decay of organic substances. |
| B. | It is an important process in the nitrogen cycle. |
| C. | It is carried out by green plants and certain bacteria. |
| D. | It is an essential process in living organisms to provide energy and in maintaining the balance between oxygen and carbon dioxide in the atmosphere. |
| Answer» E. | |
| 354. |
Decomposers include which of the following in a natural ecosystem? |
| A. | Algae only |
| B. | Green plants only |
| C. | Bacteria and fungi |
| D. | All the above |
| E. | None of these |
| Answer» D. All the above | |
| 355. |
Which of the following is/are caused due to deforestation? |
| A. | Soil erosion |
| B. | Depletion of water in the catchment areas |
| C. | Global warming |
| D. | All of these |
| Answer» E. | |
| 356. |
By which of the following methods soil erosion can be prevented? |
| A. | Afforestation |
| B. | Terrace farming |
| C. | Intensive cropping |
| D. | All the above |
| E. | None of these |
| Answer» E. None of these | |
| 357. |
Which of the following processes labelled with arrows are brought about by bacteria? |
| A. | P and Q |
| B. | Q and R |
| C. | R and S |
| D. | S and P |
| Answer» D. S and P | |
| 358. |
Identify the process through which carbon is incorporated into life-forms. |
| A. | Respiration |
| B. | Combustion |
| C. | Photosynthesis |
| D. | All the above |
| E. | None of these |
| Answer» D. All the above | |
| 359. |
Biotic components of an ecosystem consists of: |
| A. | Consumers |
| B. | Producers |
| C. | Decomposers |
| D. | All the above |
| E. | None of these |
| Answer» E. None of these | |
| 360. |
Which one among the following is used as environment indicators or bio-indicators to check the level of pollution? |
| A. | Lichens |
| B. | Mosses |
| C. | Ferns |
| D. | All the above |
| E. | None of these |
| Answer» B. Mosses | |
| 361. |
Which of the following chemicals cause the thinning of layer P? |
| A. | Carbon monoxide |
| B. | Sulphur dioxide |
| C. | Chlorofluorocarbons |
| D. | Both [a] and [c] |
| Answer» E. | |
| 362. |
Which of the following gets heat up faster by solar radiation? |
| A. | Water bodies |
| B. | Land |
| C. | Both [a] and [b] heats up at the same time. |
| D. | Either [a] or [b] |
| E. | None of these |
| Answer» C. Both [a] and [b] heats up at the same time. | |
| 363. |
Which of the following processes represents P, Q and R? |
| A. | P-Respiration, Q-Photosynthesis, R-Combustion. |
| B. | P-Respiration, Q-Combustion, R-Photosynthesis. |
| C. | P-Combustion, Q-Decay, R-Respiration. |
| D. | P-Decay, Q-Respiration, R-Photosynthesis. |
| Answer» C. P-Combustion, Q-Decay, R-Respiration. | |
| 364. |
Terrace farming helps the most in which of the following areas in soil conservation? |
| A. | Deserts |
| B. | Hilly regions |
| C. | Plains |
| D. | Wet areas |
| E. | None of these |
| Answer» C. Plains | |
| 365. |
Which of the following are the adverse effects of deforestation? |
| A. | Reduced rainfall |
| B. | Soil erosion |
| C. | Destruction of habitat |
| D. | All of these |
| Answer» E. | |
| 366. |
Which of the following processes involves the escaping of nitrogen into air from decaying matter? |
| A. | Nitrification |
| B. | Denitrification |
| C. | Nitrogen fixation |
| D. | Nitrogen assimilation |
| Answer» C. Nitrogen fixation | |
| 367. |
In which form carbon is not stored on earth? |
| A. | As organic molecule in living organisms. |
| B. | As carbon dioxide in the atmosphere. |
| C. | As water molecule |
| D. | . As organic matter in soil. |
| E. | None of these |
| Answer» D. . As organic matter in soil. | |
| 368. |
Which of the following cause greenhouse effect? |
| A. | Only (i) and (ii) |
| B. | Only (i) and (iii) |
| C. | Only (ii) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» B. Only (i) and (iii) | |
| 369. |
Identify the labelled parts P and R in the given cycle: |
| A. | P R Photosynthesis Nitrogen |
| B. | P R Respiration Combustion |
| C. | P R Excretion Oxygen |
| D. | P R Photosynthesis Carbon dioxide |
| Answer» E. | |
| 370. |
____ is present in the highest concentration in sea water. |
| A. | Sodium fluoride |
| B. | Magnesium sulphate |
| C. | Sodium chloride |
| D. | Calcium carbonate |
| E. | None of these |
| Answer» E. None of these | |
| 371. |
Which one of the following is not found in air? |
| A. | Carbon dioxide |
| B. | Argon |
| C. | Nitrogen |
| D. | Silver |
| E. | None of these |
| Answer» E. None of these | |
| 372. |
The following table shows mercury concentration in various organisms living in the same terrestrial habitat.OrganismMercury concentration (parts per trillion)P3,000Q6,90,000R8,900S2,800,000T16,000Now, select the correct food chain interlinking these organisms that will exist in the ecosystem |
| A. | \[\text{T}\to \text{Q}\to \text{P}\to \text{R}\to \text{S}\] |
| B. | \[\text{P}\to \text{Q}\to \text{R}\to \text{S}\to \text{T}\] |
| C. | \[\text{P}\to \text{R}\to \text{T}\to \text{Q}\to \text{S}\] |
| D. | \[\text{T}\to \text{R}\to \text{S}\to \text{P}\to \text{Q}\] |
| Answer» D. \[\text{T}\to \text{R}\to \text{S}\to \text{P}\to \text{Q}\] | |
| 373. |
Which of the following are negative effects on the environment from the excessive use of fertilisers in a farm situated near a lake? |
| A. | Decreased oxygen content in the water |
| B. | Decreased light penetration in the water |
| C. | Decreased population of aquatic organisms |
| D. | All of these |
| Answer» E. | |
| 374. |
Which of the following is not an effect of deforestation? |
| A. | Biodiversity loss |
| B. | Global warming |
| C. | Soil erosion |
| D. | None of these |
| Answer» E. | |
| 375. |
Which of the following would happen in the absence of greenhouse effect in the atmosphere? |
| A. | Pollution will increase. |
| B. | The earths surface temperature will increase. |
| C. | The earths surface temperature remains the same. |
| D. | The depleted ozone layer will decrease the earths temperature. |
| Answer» C. The earths surface temperature remains the same. | |
| 376. |
Which of the following activities leads to increase carbon dioxide content in air? |
| A. | Burning of fossil fuels. |
| B. | Burning of wood and charcoal |
| C. | Deforestation |
| D. | All the above |
| E. | None of these |
| Answer» E. None of these | |
| 377. |
Which of the following natural disasters affect habitat in the environment? |
| A. | Droughts |
| B. | Floods |
| C. | The thinning of the ozone layer |
| D. | All of these |
| Answer» E. | |
| 378. |
A triatomic molecule having three atoms of oxygen is: |
| A. | Elemental oxygen |
| B. | Ozone |
| C. | Tetra oxygen |
| D. | Water molecule |
| E. | None of these |
| Answer» C. Tetra oxygen | |
| 379. |
R is an organic compound containing only carbon, chlorine and fluorine. It has been widely used as refrigerant, propellent and solvent. Montreal protocol phased out manufacture of such compounds because, R contributes to S in the atmosphere.Which of the following would not be a consequence of S? |
| A. | Increased incidences of severe sunburns |
| B. | Increased incidences of cataracts |
| C. | Increased incidences of premature skin ageing |
| D. | Increased incidences of diabetes |
| Answer» E. | |
| 380. |
The given cycle represents circulation of nitrogen in the environment. Identify X, Y and Z in the cycle and select the correct option. |
| A. | X-Denitrification, Y-Ammonification, Z - Nitrogen fixation |
| B. | X - Nitrate, Y - Denitrification, Z - Ammonification |
| C. | X - Nitrate, Y - Nitrogen fixation, Z - Ammonification |
| D. | X-Nitrification, Y-Ammonification, Z - Denitrification |
| Answer» C. X - Nitrate, Y - Nitrogen fixation, Z - Ammonification | |
| 381. |
Which of the following is renewable natural resource? |
| A. | Sunlight |
| B. | Coal |
| C. | Soil |
| D. | Petroleum |
| Answer» B. Coal | |
| 382. |
The given graph shows changes in concentration of two substances X and Y in a river polluted by sewage. Which of the following options most appropriately identifies X and Y? |
| A. | X-Carbon dioxide, Y-Nitrogen compounds |
| B. | X-Nitrogen compounds; Y-Carbon dioxide |
| C. | X-Nitrogen compounds; Y-Oxygen |
| D. | X-Oxygen; Y-Nitrogen compounds |
| Answer» E. | |
| 383. |
Signs of eutrophication of water bodies include. |
| A. | reduced oxygen demand |
| B. | rapid decomposition of organic matter. |
| C. | algal bloom. |
| D. | fluorosis. |
| Answer» D. fluorosis. | |
| 384. |
Few characteristics of a type of soil are given below. Find the type of the soil based on the given characteristics. (i) Presence of iron oxides in the soil. (ii) Formed by the erosion of rocks in areas of high temperature. (iii) Soil appears red in colour. (iv) Found in western and eastern ghats. (v) Soil is not very fertile. |
| A. | Alluvial soil |
| B. | Laterite soil |
| C. | Red soil |
| D. | Black soil |
| E. | None of these |
| Answer» C. Red soil | |
| 385. |
The given figure shows a river and the types of land use on the sides of the river. The water quality of the river was studied by measuring the amounts of dissolved oxygen and ammonia in the water collected at sites X, Y and Z. The results are given below:SiteDissolved oxygen \[\text{(c}{{\text{m}}^{\text{3}}}\text{/litre)}\]Ammonia (ppm)X8.90.02Y0.30.62Z1.65.30 Which of the following is correct regarding this? |
| A. | Site X has the highest content of dissolved oxygen because of eutrophication. |
| B. | Site Z has the highest concentration of ammonia because of leaching of fertilisers from the nearby crop fields. |
| C. | Organisms such as algae and weeds will thrive at site Y, while very few fishes are found at site Y. |
| D. | Both (b) and (c). |
| Answer» E. | |
| 386. |
Which of these methods is/are used to control water pollution? |
| A. | Only (i) and (ii) |
| B. | Only (ii) and (iii) |
| C. | Only (i), (ii), (iii) |
| D. | (i), (ii) and (iii) |
| Answer» E. | |
| 387. |
Organisms like lichens are very sensitive to the levels of |
| A. | Carbon dioxide |
| B. | Sulphur dioxide |
| C. | Carbon monoxide |
| D. | Methane. |
| Answer» C. Carbon monoxide | |
| 388. |
Identify T in the given water cycle. |
| A. | Melting |
| B. | Condensation |
| C. | Evaporation |
| D. | Precipitation |
| Answer» C. Evaporation | |
| 389. |
The zone of earth where the atmosphere, hydrosphere and lithosphere interact is: |
| A. | Microsphere |
| B. | Lithosphere |
| C. | Biosphere |
| D. | Stratosphere |
| E. | None of these |
| Answer» D. Stratosphere | |
| 390. |
Which of the following statements is incorrect regarding nitrogen fixation? |
| A. | Nitrosomonas converts ammonia into nitrites. |
| B. | Nitrobacter converts nitrites into nitrates. |
| C. | Both (a) and (b) can be called nitrification. |
| D. | Nitrosomonas and Nitrobacter are usually photoautotrophs. |
| Answer» E. | |
| 391. |
Zephyr refers to: |
| A. | A gale with great speed. |
| B. | A soft gentle breeze. |
| C. | A type of soil. |
| D. | Name of a pesticide. |
| E. | None of these |
| Answer» C. A type of soil. | |
| 392. |
Soil is a complex mixture. The given figure shows the percentage by volume of different soil components as P, 0, R and S. What will you place at S? |
| A. | Air |
| B. | Water |
| C. | Organic matter |
| D. | Either air or water |
| Answer» E. | |
| 393. |
Which of these statements is/are true about the given sample of air? |
| A. | Dissolved air from pond water |
| B. | Fresh air from a field |
| C. | Exhaled air |
| D. | Polluted air near a factory |
| Answer» D. Polluted air near a factory | |
| 394. |
Arrange the following components in decreasing order according to their percentage present in air. |
| A. | Nitrogen, Oxygen, Argon, Carbon dioxide. |
| B. | Oxygen, Argon, Carbon dioxide, Nitrogen. |
| C. | Nitrogen, Carbon dioxide, Oxygen, Argon. |
| D. | Nitrogen, Oxygen, Carbon dioxide, Argon. |
| E. | None of these |
| Answer» B. Oxygen, Argon, Carbon dioxide, Nitrogen. | |
| 395. |
Match column I with column II and select the correct option from the given codes. Column I Column II (a) Particulate matter (i) Chemical water pollutant (b) Heat (ii) Non-degradable soil pollutant (c) Detergent (iii) Degradable (d) Plastic (iv) Air pollutant (e) Vegetable peel (v) Physical water pollutant |
| A. | (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii), (e)-(v) |
| B. | (a)-(iv), (b)-(v), (c)-(i), (d)-(ii), (e)-(iii) |
| C. | (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv), (e)-(v) |
| D. | (a)-(i), (b)-(ii), (c)-(iii), (d)-(v), (e)-(iv) |
| Answer» C. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv), (e)-(v) | |
| 396. |
What is the role of the bacteria in Root nodules of legumes |
| A. | To convert oxides of nitrogen into soil nitrates. |
| B. | To convert atmospheric nitrogen gas into soil nitrates. |
| C. | To convert soil nitrates into gaseous nitrogen. |
| D. | To convert plant proteins into ammonia. |
| Answer» C. To convert soil nitrates into gaseous nitrogen. | |
| 397. |
Which one among the following is not a layer of atmosphere? |
| A. | Mesosphere |
| B. | Stratosphere |
| C. | Lithosphere |
| D. | Troposphere |
| E. | None of these |
| Answer» D. Troposphere | |
| 398. |
Which of the following gas is responsible for causing green-house effect? |
| A. | Carbon dioxide |
| B. | Methane |
| C. | Nitrous oxide |
| D. | All the above |
| E. | None of these |
| Answer» E. None of these | |
| 399. |
Eutrophication is the process in which dissolved oxygen in water is reduced due to excessive growth of algae. This is the result of |
| A. | Change in temperature of water |
| B. | Extra loading of nutrients in water body |
| C. | Stratification of aquatic habitat |
| D. | Bioaccumulation in algae. |
| Answer» C. Stratification of aquatic habitat | |
| 400. |
The given graph shows the amount of pollutants in four rivers P, Q, R and S. The river that can continue to support the most number of aquatic plants and animals is _____. |
| A. | P |
| B. | Q |
| C. | R |
| D. | S |
| Answer» B. Q | |