1
Question
Which one of the following statements is correct?
Which one of the following statements is correct?
Open in App
Solution
The correct option is C Steller’s sea cow is an extinct animal
Biodiversity refers to the huge variety and variability that exists at different levels of biological organisation.
The global species diversity of earth is estimated to be around 7 million by Robert May.
But, the rapid loss of biodiversity due to extinction (complete disappearance of a species from the surface of earth) of species in the past 500 years is alarming.
Biodiversity loss is primarily an outcome of human activities such as hunting, habitat destruction, over-exploitation, introduction of alien species, etc. Hence, many species have become extinct or endangered (facing risk of extinction).
The International Union for Conservation of Nature (IUCN) has recorded the extinction of a total 784 species in the past 500 years and Steller's sea cow of Russia is listed as an extinct animal. It has been hunted to extinction by humans.
Therefore, the statement in option (c) is correct.
Rest of the statements are incorrect.
A species whose distribution is confined to a particular geographical area and not found anywhere else is said to be endemic species.
Parthenium (carrot grass) is not an endemic species of India, rather it is believed to have been introduced into India as contaminants in wheat imported from the USA. It is an invasive weed (non-native species) which grows rapidly and adversely affects the native species and also disrupts the ecosystem it colonizes.
Lantana, another alien species (non-native species), also strongly competes with the native species.
Parthenium is popularly known as carrot grass, not Lantana.
African catfish is also an alien species which adversely affects the growth of indigenous catfishes in our rivers.
Biodiversity refers to the huge variety and variability that exists at different levels of biological organisation.
The global species diversity of earth is estimated to be around 7 million by Robert May.
But, the rapid loss of biodiversity due to extinction (complete disappearance of a species from the surface of earth) of species in the past 500 years is alarming.
Biodiversity loss is primarily an outcome of human activities such as hunting, habitat destruction, over-exploitation, introduction of alien species, etc. Hence, many species have become extinct or endangered (facing risk of extinction).
The International Union for Conservation of Nature (IUCN) has recorded the extinction of a total 784 species in the past 500 years and Steller's sea cow of Russia is listed as an extinct animal. It has been hunted to extinction by humans.
Therefore, the statement in option (c) is correct.
Rest of the statements are incorrect.
A species whose distribution is confined to a particular geographical area and not found anywhere else is said to be endemic species.
Parthenium (carrot grass) is not an endemic species of India, rather it is believed to have been introduced into India as contaminants in wheat imported from the USA. It is an invasive weed (non-native species) which grows rapidly and adversely affects the native species and also disrupts the ecosystem it colonizes.
Lantana, another alien species (non-native species), also strongly competes with the native species.
Parthenium is popularly known as carrot grass, not Lantana.
African catfish is also an alien species which adversely affects the growth of indigenous catfishes in our rivers.
Suggest Corrections
1
Similar questions
Join BYJU'S Learning Program
Explore more
Join BYJU'S Learning Program
