Natural disasters, such as floods, earthquakes, and landslides, can cause habitat loss, but they are not considered a major cause compared to human activities like deforestation, urbanization, and mining.

Water pollution in India is caused by a combination of industrial effluents, agricultural runoff, and sewage discharge. These pollutants contaminate water bodies, leading to degradation of aquatic ecosystems and posing health risks to humans and wildlife.

Climate change generally leads to negative impacts on biodiversity, such as shifts in species distribution, increased frequency of extreme weather events, and loss of genetic diversity. Enhanced ecosystem productivity is not a direct consequence of climate change.

Overexploitation refers to the excessive and unsustainable extraction of natural resources, such as forests, fisheries, and minerals, beyond their capacity to regenerate or replenish.

Water Hyacinth, Lantana Camara, and Parthenium Hysterophorus are all examples of invasive alien species that have become a threat to biodiversity in India. They compete with native species for resources, disrupt ecosystems, and can cause economic losses.

Agriculture is the primary cause of deforestation in the Western Ghats. The conversion of forest land to agricultural land, particularly for cash crops like coffee and tea, has resulted in significant habitat loss and fragmentation.

Conservation Reserve is not a protected area category in India. The three main categories of protected areas in India are National Parks, Wildlife Sanctuaries, and Biosphere Reserves.

Vehicular emissions are the primary cause of air pollution in urban areas of India. The increasing number of vehicles, coupled with poor fuel quality and inefficient emission control systems, contribute to high levels of air pollutants such as particulate matter, nitrogen oxides, and carbon monoxide.

Oil spills are not considered a major threat to marine biodiversity in India compared to overfishing, bycatch, and coral bleaching. While oil spills can cause localized damage to marine ecosystems, they are not as widespread or persistent as the other threats mentioned.

Invasive species are non-native species that have been introduced to an area and have become a threat to native biodiversity. They can compete with native species for resources, transmit diseases, or alter ecosystems, leading to a decline in biodiversity.

Overgrazing is not a major threat to biodiversity in the Sundarbans. The primary threats to biodiversity in this region include habitat loss due to coastal development and agriculture, climate change-induced sea-level rise and increased frequency of cyclones, and pollution from industrial and agricultural activities.

Genetic erosion refers to the loss of genetic diversity within a population. This can occur due to factors such as habitat loss, fragmentation, overexploitation, and inbreeding. Genetic erosion reduces the ability of a population to adapt to environmental changes and increases its susceptibility to diseases and pests.

Overgrazing is not a major threat to biodiversity in the Eastern Himalayas. The primary threats to biodiversity in this region include deforestation for agriculture and logging, climate change-induced changes in temperature and precipitation patterns, and mining activities.

Land conversion refers to the process of converting natural ecosystems, such as forests, grasslands, or wetlands, into agricultural land or other human-modified landscapes. This conversion can have significant negative impacts on biodiversity, as it results in habitat loss, fragmentation, and disruption of ecological processes.

Overfishing is not a major threat to biodiversity in the Andaman and Nicobar Islands. The primary threats to biodiversity in this region include habitat loss due to deforestation and coastal development, climate change-induced sea-level rise and increased frequency of cyclones, and the introduction of invasive alien species.