MCQOPTIONS
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MCQOPTIONS
This section includes 286 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
The rate of growth of a natural population |
| A. | Always reaches the carrying capacity of the ecosystem |
| B. | Is limited by the carrying capacity of the ecosystem |
| C. | When graphed, always has a positive slope |
| D. | Is calculated by subtracting death rate from birth rate |
| Answer» C. When graphed, always has a positive slope | |
| 252. |
Which of the following pairs of an animal and a plant represents endangered organisms in India ? |
| A. | Banyan and black duck |
| B. | Bentinckianscobarica and red panda |
| C. | Tamarind and rhesus monkey |
| D. | Cinchona and leopard |
| Answer» C. Tamarind and rhesus monkey | |
| 253. |
Human activities in the recent past have caused the increased concentration of carbon dioxide in the atmosphere, bu a lot of it does not remain in the lower atmosphere because of |
| A. | 1 and 2 |
| B. | 2 only |
| C. | 2 and 3 only |
| D. | 3 only |
| Answer» D. 3 only | |
| 254. |
In the context of ecosystem productivity, marine upwelling zones are important as they increase the marine productivity by bringing the |
| A. | 1 and 2 |
| B. | 2 only |
| C. | 2 and 3 |
| D. | 3 only |
| Answer» C. 2 and 3 | |
| 255. |
There is a concern over the increase in harmful algae blooms in the sea waters of India. What could be the causative factors for this phenomenon ? |
| A. | 1 only |
| B. | 1 and 2 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» C. 2 and 3 only | |
| 256. |
Biodiversity forms the basis for human existence in the following ways : |
| A. | 1, 2 and 3 only |
| B. | 2, 3 and 4 only |
| C. | 1 and 4 only |
| D. | 1, 2, 3 and 4 |
| Answer» E. | |
| 257. |
Recently, "oilzapper" was in the news. What is it ? |
| A. | It is an eco-friendly technology for the remediation of oily sludge and oil spills |
| B. | It is the latest technology developed for under-sea oil exploration |
| C. | It is a genetically engineered high biofuel-yielding maize variety |
| D. | It is the latest technology to control the accidentally caused flames from oil wells |
| Answer» B. It is the latest technology developed for under-sea oil exploration | |
| 258. |
The importance of ecosystem lies is |
| A. | Cycling of material |
| B. | Flow of energy |
| C. | Both a & b |
| D. | Its biomass |
| Answer» D. Its biomass | |
| 259. |
Primary consumer of a ecosystem is |
| A. | Producer |
| B. | Herbivorous |
| C. | Carnivorous |
| D. | Decomposer |
| Answer» C. Carnivorous | |
| 260. |
The niche of an animal is best defined as ? |
| A. | The number of individuals of the species the environment will support |
| B. | The same as its habitat |
| C. | All the ways an animal fits into its environment |
| D. | The specific place within the habitat where the animal lives |
| Answer» E. | |
| 261. |
Some water, a small amount of soil a, few green aquatic plants and a fish were placed in a large bottle. The bottle was sealed to prevent the exchange of gases and other materials between its contents and the outside. The bottle was placed in a window to receive light during the daytime. Is carbon dioxide produced by the plants ? |
| A. | Yes, but it is produced only at night when the plants can no longer carry on photosynthesis. |
| B. | It is produced all the time as a result of cellular respiration. |
| C. | No, it is a waste product of animals only. |
| D. | No, plants take in only the waste products exhaled by animals. |
| Answer» C. No, it is a waste product of animals only. | |
| 262. |
The "Red Data books" published by the International Union for Conservation of Nature and Natural Resources (IUCN) contain lists of |
| A. | 1 and 3 |
| B. | 2 only |
| C. | 2 and 3 |
| D. | 3 only |
| Answer» C. 2 and 3 | |
| 263. |
Biodiversity hotspots |
| A. | 1, 2 |
| B. | 2, 3, 4 |
| C. | 2, 3 |
| D. | 2, 4 |
| Answer» E. | |
| 264. |
Along a food chain, the role of .............is to help |
| A. | Decomposers (bacteria, fungus) |
| B. | Consumers (lions, tigers) |
| C. | Prey (deer, water buffaloes) |
| D. | Producers (plants, trees) |
| Answer» B. Consumers (lions, tigers) | |
| 265. |
A term |
| A. | All individuals having same Phenotype |
| B. | All individuals having same genotype |
| C. | All individual with different phenotype |
| D. | All individuals with different genotype |
| Answer» B. All individuals having same genotype | |
| 266. |
Mangroves are salt-tolerant forest ecosystems. Name the |
| A. | The Sunderbans in West Bengal |
| B. | Muisue Forests in Eucador |
| C. | The Mekong Delta in Vietnam |
| D. | None of these |
| Answer» B. Muisue Forests in Eucador | |
| 267. |
Regarding |
| A. | The carbon credit system was ratified in conjunction with the Kyoto Protocol |
| B. | Carbon credits are awarded to countries or groups that have reduced greenhouse gases below their emission quota |
| C. | The goal of the carbon credit system is to limit the increase of carbon dioxide emission |
| D. | Carbon credits are traded at a price fixed from time to time by the United Nations Environment Programme |
| Answer» E. | |
| 268. |
In your opinion, which is the most effective way to conserve the |
| A. | By creating biosphere reserve |
| B. | By creating botanical gardens |
| C. | By developing seed bank |
| D. | By tissue culture method |
| Answer» B. By creating botanical gardens | |
| 269. |
Which one of the following is a pair of |
| A. | Garden lizard and Maxican poppy |
| B. | Rhesus monkey and Sal tree |
| C. | Indian peacock and Carrot grass |
| D. | Hornbnill and Indian Aconite |
| Answer» E. | |
| 270. |
Which of the following lists include only |
| A. | Food, temperature, fire, wind |
| B. | Soil minerals, oxygen level, light, predators |
| C. | Wind, rainfall, temperature, soil minerals |
| D. | Light, food, predators, competitors |
| Answer» D. Light, food, predators, competitors | |
| 271. |
In a mountaenous terrain, |
| A. | Lower latitudes and higher altitudes |
| B. | Higher latitudes and lower altitudes |
| C. | Lower latitudes and lower altitudes |
| D. | Higher latitudes and higher altitudes |
| Answer» D. Higher latitudes and higher altitudes | |
| 272. |
Read the two statements A and B |
| A. | Statement A is Correct, B is wrong |
| B. | Statement B is Correct, A is wrong |
| C. | Both the statements A and B are correct |
| D. | Both the statements A and B are wrong. |
| Answer» B. Statement B is Correct, A is wrong | |
| 273. |
During the growth of a tomato plant from a seed, it increases considerably in biomass. Which of the following |
| A. | Carbon dioxide and water. |
| B. | Carbon dioxide, oxygen, and nitrogen. |
| C. | Water, nitrate, and methane. |
| D. | Water, carbon dioxide, and mineral salts. |
| Answer» E. | |
| 274. |
Which of the following is not one of the major environment problems resulting from human interference in the nitrogen cycle ? |
| A. | Eutrophication |
| B. | Nitrous oxide release increases global warming |
| C. | Increased acid rain |
| D. | Stratospheric ozone depletion |
| Answer» E. | |
| 275. |
Which of the following affects biodiversity |
| A. | Climate change |
| B. | Ocean acidification |
| C. | Environmental pollution |
| D. | All of the above |
| Answer» C. Environmental pollution | |
| 276. |
The Secretariat of the conventions on Biological Diversity, coordinating the International year of |
| A. | Italy |
| B. | London |
| C. | Toronto |
| D. | Montreal |
| Answer» E. | |
| 277. |
Consider the following list of factors : |
| A. | 1 and 3 |
| B. | 3 and 5 |
| C. | 2 and 4 |
| D. | 2 and 5 |
| Answer» E. | |
| 278. |
The decomposers in and ecosysteme are |
| A. | Prokaryotes and plants |
| B. | Prokaryotes an animals |
| C. | Plants and animals |
| D. | Fungi and Prokaryotes |
| Answer» E. | |
| 279. |
What is the primary reason for targeting 'biodiversity hotspots' for conservation ? |
| A. | To protect all areas of threatened species would not allow for new species to develop |
| B. | The number of species threatened far exceeds our capacity to protect them and we can therefore on;y concentrate on areas of highest species diversity |
| C. | They are areas where people do not live and conservation would therefore not be effecting the economic development of the area |
| D. | The are the only areas where species are seriously threatened in the world |
| Answer» C. They are areas where people do not live and conservation would therefore not be effecting the economic development of the area | |
| 280. |
The single greatest current threat to biodiversity is |
| A. | Global warming |
| B. | Habitat destruction |
| C. | introduced species |
| D. | overhunting |
| Answer» C. introduced species | |
| 281. |
Edge species |
| A. | decrease biodiversity |
| B. | exist only increases that have been altered by humans |
| C. | May require conditions found in both of the bordering ecosystems |
| D. | require the unique homogenous edge eivironment |
| Answer» C. May require conditions found in both of the bordering ecosystems | |
| 282. |
What was the message that the club of Rome were trying to send to the world in 1972 ? |
| A. | Nuclear power is the answer to the world s resource limitations |
| B. | Global populations will naturally start to decline and therefore the world's problems will begin to subside |
| C. | Humans were heading on a path to massive environmental degradation and resource exhaustion |
| D. | None of these |
| Answer» D. None of these | |
| 283. |
A molecule of nitrogen which you have just breathed in may have been part of a plant that lived thousands of years ago, or part of a dinosaur that lived millions of years ago. This illustrates the principle that |
| A. | Dead organisms may be fossilized |
| B. | Molecules of cytoplasm may be replaced by inorganic salts. |
| C. | Nitrogen does not combine readily with other elements. |
| D. | Decay bacteria cycle elements. |
| Answer» E. | |
| 284. |
Which one of the following pairs of geographical areas show maximum biodiversity in our country ? |
| A. | Sunderbans and Rann of Kuntch |
| B. | Eastern ghats and West Bengal |
| C. | Eastern Himalaya and Western ghats |
| D. | Kerala and Punjab |
| Answer» D. Kerala and Punjab | |
| 285. |
Biosphere reserves differ from national parks and wildlife sanctuaries because in the former |
| A. | Human beings are not allowed to enter |
| B. | People are an integral part of the system |
| C. | Plants are paid greater attention than than animals |
| D. | Living organisms are brought from all over the world and preserved for posterity |
| Answer» C. Plants are paid greater attention than than animals | |
| 286. |
The "greenhouse effect" refers to : |
| A. | Increasing agricultural yields |
| B. | Gradual warming of the earth's surface |
| C. | Build-up of toxic airborne pollutants |
| D. | Reduction in the earth's ozone layer |
| Answer» C. Build-up of toxic airborne pollutants | |