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100 questions in this collection · Page 10 of 10
Question 91 of 100
📘 CLASS XII
Biodiversity And Conservation
Read the following statements regarding the term 'biodiversity':
I. 'Biodiversity' is a term popularized by the sociobiologist Edward Wilson. II. It describes the combined diversity at all levels of biological organization. III. Edward Wilson was a physical anthropologist who studied only the genetic diversity of human populations.
Which of the statements given above are correct?
Biodiversity was popularized by sociobiologist Edward Wilson to describe the combined biological diversity at all levels of organization. He was not a physical anthropologist. Therefore, statement III is incorrect, while statements I and II are correct.
Question 92 of 100
📘 CLASS XII
Biodiversity And Conservation
Analyze the following statements regarding historical extinctions caused by humans:
I. Human colonization of tropical Pacific Islands led to the extinction of over 2,000 species of native birds. II. The IUCN Red List (2004) documents the extinction of 784 species in the last 500 years. III. This list of 784 extinct species consists of exactly 338 vertebrates, 359 invertebrates, and 87 plants.
Which of the statements given above are correct?
All three statements are correct. Human activities and colonization led to the loss of more than 2,000 native bird species on Pacific Islands, and the IUCN Red List (2004) documents 784 extinctions comprising 338 vertebrates, 359 invertebrates, and 87 plants.
Question 93 of 100
📘 CLASS XII
Biodiversity And Conservation
Consider the following statements about alien species introductions and their impacts:
I. The Nile perch was introduced into Lake Victoria in west Africa. II. Its introduction led to the extinction of an ecologically unique assemblage of over 200 species of cichlid fish. III. Cichlid fish are a species of marine mammals native to Lake Victoria.
Which of the statements given above is/are correct?
Statement I is incorrect because Lake Victoria is located in east Africa. Statement III is incorrect because cichlid fish are fishes, not marine mammals. Only statement II is correct.
Question 94 of 100
📘 CLASS XII
Biodiversity And Conservation
Study the statements regarding the locations of sacred groves in India:
I. Sacred groves are found in the Khasi and Jaintia Hills of Meghalaya. II. The Aravalli Hills of Rajasthan represent a notable region containing sacred groves. III. In Meghalaya, sacred groves serve as the last refuges for a large number of rare and threatened plants. IV. The Western Ghats of Kerala and Tamil Nadu are the only places in India where sacred groves are legally prohibited.
Which of the statements given above are correct?
Statements I, II, and III are correct. Statement IV is incorrect because sacred groves are also widely distributed in the Western Ghats of Karnataka and Maharashtra and are protected, not prohibited.
Question 95 of 100
📘 CLASS XII
Biodiversity And Conservation
With reference to tropical environment constancy and predictability, evaluate the following statements:
I. Tropical environments are highly seasonal, which forces organisms to adapt and mutate faster. II. They are relatively more constant and predictable compared to temperate environments. III. Relatively constant environments promote niche specialization, leading to greater species diversity.
Which of the statements given above are correct?
Statement I is incorrect because tropical environments are less seasonal and more predictable than temperate environments. Statements II and III are correct.
Question 96 of 100
📘 CLASS XII
Biodiversity And Conservation
Consider the following statements regarding global species estimates and the proposal by Robert May:
I. Extreme global estimates of biodiversity range from 20 to 50 million species. II. Robert May proposed a conservative and scientifically sound global estimate of about 7 million species. III. Robert May's estimate states that 1.5 million is the absolute maximum limit of life on Earth.
Which of the statements given above are correct?
Statements I and II are correct. Statement III is incorrect because 1.5 million represents the number of species already described, not the maximum number of species on Earth.
Question 97 of 100
📘 CLASS XII
Biodiversity And Conservation
Read the following statements regarding the use of plant species in human health and traditional medicine:
I. More than 25 per cent of the drugs currently sold in the market worldwide are derived from plants. II. Exactly 25,000 species of plants contribute to the traditional medicines used by native peoples around the world. III. Native traditional medicines use only marine algae and no terrestrial vascular plants.
Which of the statements given above are correct?
Statements I and II are correct. Statement III is incorrect because traditional medicines utilize a vast range of terrestrial plant species in addition to other organisms.
Question 98 of 100
📘 CLASS XII
Biodiversity And Conservation
Study the statements regarding the comparative species richness of fungi:
I. The number of fungi species in the world is more than the combined total of the species of fishes, amphibians, reptiles, and mammals. II. Fungi comprise more species than all vertebrate species combined. III. There are more species of amphibians than there are of fungi worldwide.
Which of the statements given above are correct?
Statements I and II are correct because fungi outnumber the combined total of vertebrate species. Statement III is incorrect because fungi are far more species-rich than amphibians.
Question 99 of 100
📘 CLASS XII
Biodiversity And Conservation
Consider the following statements about the ecosystem services provided by the Amazon forest:
I. The Amazon rain forest produces about 20 per cent of the total oxygen in the Earth's atmosphere through photosynthesis. II. This massive oxygen output is considered a direct economic benefit under the narrowly utilitarian argument. III. This role of oxygen production is an example of a broadly utilitarian ecosystem service provided by nature.
Which of the statements given above are correct?
Statements I and III are correct. Oxygen production is an indirect ecosystem service and therefore falls under the broadly utilitarian argument, not the narrowly utilitarian argument.
Question 100 of 100
📘 CLASS XII
Biodiversity And Conservation
With reference to the consequences of regional biodiversity loss, evaluate the following statements:
I. Loss of biodiversity in a region leads to an increase in plant production due to a reduction in plant pathogens. II. It leads to lowered resistance of ecosystems to environmental perturbations such as drought. III. It leads to increased variability in certain ecosystem processes such as plant productivity, water use, and pest/disease cycles.
Which of the statements given above are correct?
Statement I is incorrect because biodiversity loss leads to a decline in plant production. Statements II and III are correct because biodiversity loss lowers ecosystem resistance to disturbances and increases variability in ecosystem processes.