The question asks for Robert May's scientifically sound estimate of total global species diversity. This is a factual question related to biodiversity and ecology, often covered in environmental science or biology sections of competitive exams. We need to recall the specific estimate provided by Robert May.
C) 7 million. Robert May's scientifically sound estimate for the total global species diversity is approximately 7 million. This figure is based on a statistical approach that extrapolates species richness from known groups to unknown ones.
The question asks for the full form of the acronym IUCN. This is a direct knowledge-based question related to international environmental organizations. Recalling the correct full form is key.
Correct Option: B) International Union for Conservation of Nature and Natural Resources
IUCN stands for the International Union for Conservation of Nature and Natural Resources. It is an international organization working in the field of nature conservation and sustainable use of natural resources. It was founded in 1948 and is known for compiling the IUCN Red List of Threatened Species.
The question asks for the percentage of all recorded species on Earth that are animals. This is a factual recall question related to biodiversity and species distribution, often covered in environmental science or biology sections of competitive exams.
Correct Option: A) 70% — Scientific data indicates that animals comprise more than 70% of all species recorded on Earth. This figure is a well-established fact in biology and environmental studies.
The question asks to identify the most species-rich taxonomic group among animals, specifically one that constitutes over 70% of all animal species. This requires knowledge of animal diversity and the relative proportions of different animal phyla/classes.
Insects (Class Insecta) are by far the most diverse group of animals, belonging to the phylum Arthropoda. They are estimated to make up more than 70% of all known animal species on Earth. Their success is attributed to various factors such as their small size, exoskeleton, ability to fly, high reproductive rates, and complex life cycles.
C) Insects — Insects constitute the largest group of animals, with millions of described species and many more yet to be discovered. They account for over 70% of all animal species, making them the most species-rich taxonomic group.
The question asks about the relative abundance of fungal species compared to other animal groups. This requires knowledge of biodiversity estimates for different taxonomic groups.
B) More than the combined total of fishes, amphibians, reptiles and mammals — Let's sum the approximate numbers for these groups: \(34,000 (\text{fishes}) + 8,000 (\text{amphibians}) + 11,000 (\text{reptiles}) + 6,500 (\text{mammals}) = 59,500\) species. Even the described number of fungal species (~120,000) is significantly higher than this combined total. The estimated total number of fungal species (millions) is vastly greater. Therefore, this statement is correct.
The question asks for India's approximate share of the world's total land area. This is a factual question related to India's geography and requires knowledge of basic geographical statistics.
Correct Option: A) 2.4% — India's total geographical area is about 3.28 million square kilometers. This constitutes approximately 2.4% of the world's total land area. It is the seventh-largest country in the world by area.