In terms of plant diversity, India ranks tenth in the world and fourth in Asia. India is home to nearly 11% of the world's known floral diversity. India's flora is one of the richest in the world due to the country's diverse climate, topography, and habitat. Over 18,000 flowering plant species are estimated to exist in India, accounting for 6-7 percent of all plant species worldwide. India is home to over 50,000 plant species, including a number of endemics. More than 3000 Indian plant species have been officially documented as belonging to eight floristic regions: the Western Himalayas, the Eastern Himalayas, Assam, the Indus plain, the Ganges plain, the Deccan, Malabar, and the Andaman Islands. In this article, we will discuss Floral Diversity which will be helpful for UPSC exam preparation.

Floral Diversity in India

• Floral diversity refers to the variety of plants found in a given region at a given time. It generally refers to the variety of indigenous or native plants that occur naturally.
• To date, a total of 215,644 plant species have been catalogued on Earth, out of the 298,000 predicted.
• Out of an estimated 16,600 plant species, 8,600 have been recorded from the ocean.
• India, as a tropical country, is home to 54,733 species, including viruses, bacteria, and fungi.
• Floral diversity in India is concentrated in four phytogeographically distinct regions: the Himalayas, the Western Ghats, Northeast India, and the Andaman and Nicobar Islands.
• The Indian Flora accounts for 11.4% of all recorded plant species in the world, with approximately 28% of plant species being endemic to India.
• Angiosperms are the most numerous plant group in India, accounting for 39.92% of the country's floral diversity.
• Fungi, with 15,504 species, account for the remaining 28.33%. The country also has a high diversity of cryptogam (Bryophytes and Pteridophytes).
• So far, 1,310 Pteridophytes species and approximately 2,791 Bryophytes species have been identified in India.
• The Himalayas, Nilgiris, Western Ghats, Eastern Ghats, and Andaman and Nicobar Islands are also abundant in bryophytes (mosses and liverworts).
• In India, algae and fungi are widely distributed.
• The diversity of marine algae appears to be highest on the Gujarat coast's Okha-Dwarka region and the Tamil Nadu coast's Mandappam-Pamban region.
• Lichens are composite organisms made up of symbiotic algae and fungi that can be found in abundance in the Western Ghats, the Eastern and Western Himalayas, and the Andaman and Nicobar Islands. So far, 2,961 Lichene species have been identified in India.
• The majority of ferns and gymnosperms (including cycads, pines, firs, and junipers) grow in the cool temperate zones of the Himalayas and in the mountainous regions of southern India, particularly in the Western Ghats.
• Current estimates place the Indian flora at nearly 12% of the global floral diversity (excluding viruses).

Important Floral Groups in India

Algae

• Algae are green non-differentiated plants with chlorophyll. They typically grow in water or in moist environments.
• Freshwater algae are typically green or blue-green in colour, whereas marine algae are red or brown.
• These are autotrophic plants, meaning they can produce their own food.

Fungi

• Fungi are non-green, non-differentiated plants that lack chlorophyll completely.
• They grow as saprophytes on dead, rotten organic matter or as parasites on other living bodies known as hosts.
• Saprophytic fungi include moulds and mushrooms.
• The Western Ghats have the most fungi diversity, followed by the eastern and western Himalayas.

Bacteria

• Non-chlorophyllous microorganisms that live a saprophytic or parasitic existence.
• Many of them are pathogenic, but saprophytic bacteria are beneficial.
• They are soil-borne, and many of them are used in industries.

Lichens

• A lichen is a strange hybrid of an alga and a fungus, with the two living together for mutual benefit.
• They are a group of greyish green plants that grow on rocks, tree trunks, dead wood, and other surfaces.
• The algae produces food for the fungus, and it absorbs and retains water, keeping the algal cells moist.
• They are most common in wetlands, rare in rivers and streams, and not found in groundwater.

Bryophytes

• The plant's body is divided into a small stem and simple leaves, but there are no true roots.
• They prefer moist environments. Examples include liverworts and mosses.
• They are India's second largest group of green plants, primarily found in the Eastern Himalaya, North-eastern India, Western Himalaya, and Western Ghats.
• Mosses are the most abundant species in Indian bryoflora, followed by liverworts and hornworts.

Pteridophytes

• Pteridophytes have distinct plant bodies composed of roots, stems, and leaves. They also have vascular bundles.
• The majority of them are terrestrial plants that thrive in moist and shady environments, but some are aquatic.
• This category includes vascular cryptogams such as clubmosses, horsetails, and ferns, which are found all over the world.
• The north-eastern region (including the Eastern Himalaya) has the most pteridophytic diversity, followed by south India (including the Eastern and Western Ghats) and north India (including Western Himalaya).

Gymnosperms

• Gymnosperms are naked-seeded plants (gymnos=naked, sperma=seed).
• They have simple flowers with no accessory whorls, and their stamens and carpels remain aggregated in cones.
• Ovules are found on the surface of carpels and are pollinated directly by pollen grains.
• There is no such thing as an ovary, style, or stigma, and there is, of course, no fruit.
• Examples include Cycas, Pinus, and Gnetum.
• The largest family is the pine family. Gnetum and Cycas are mostly found in the North East, the Eastern and Western Ghats, and the Andaman and Nicobar Islands.

Angiosperms

• Angiosperms (angeion - a case) are closed-seeded plants.
• These are the most developed plants, with flowers that have prominent accessory and essential whorls.
• Carpels have the ovary, style, and stigma.
• The ovary usually develops into a fruit and the ovules into seeds in response to fertilisation. As a result, the seeds remain inside the fruits.
• More than 7% of the world's flowering plants are found in India.

Floral Endemism

• Floral Endemism refers to the phenomenon of flower species being restricted to a specific geographical area. Its metric defines species diversity at any given location.
• The following is the sequence of floral endemism in India (in descending order):
  • Peninsular India, including the Western and Eastern Ghats (about 2,600 species)
  • Eastern Himalaya and the north-eastern region (about 2,500 species)
  • The north-western Himalaya (about 800 species)
  • The Andaman and Nicobar Islands (about 250 species)

Significance of Flora

• The flora produces oxygen, which the fauna uses for respiratory purposes. In turn, fauna liberates carbon dioxide used by flora for photosynthesis.
• Flora provides enormous benefits to humanity through medicinal and food offerings.
• Flora found all over the world contributes to the earth's aesthetic value.
• People go to biosphere reserves, national parks and zoos, forests, botanical gardens, and other places to admire the beauty of landmarks.
• Flora also supports local economies through tourism.

Crop Genetic Diversity

• Agriculture continues to be a major driver and pillar of India's economic growth.
• The country's large mosaic of distinct agro-ecosystems, defined by differences in edaphic, climatic, and geographic features, has contributed to diverse cropping patterns and systems.
• In terms of species contribution to agriculture and animal husbandry, India ranks seventh in the world.
• The National Bureau of Plant Genetic Resources (NBPGR) in Delhi is primarily responsible for the long-term conservation of unique accessions as base collections for posterity, primarily in the form of seeds.

Conclusion

The number of species of wild relatives of crop plants found in various regions of India demonstrates the importance of the Indian flora. Flora is critical to human survival. Conservation is a protective measure designed to prevent the loss of genetic diversity in all species, save species from extinction, and ultimately protect all ecosystems from damage in order to promote their long-term use.

FAQs

Question: What is floral diversity?

Question: Why is floral diversity important for ecosystems?

Question: What factors influence floral diversity in India?

Question: How is India's floral diversity distributed across different regions?

Question: What steps are being taken to conserve India's floral diversity?

MCQs

1. Floral diversity refers to:

A) The variety of animal species in a region

B) Different types of trees only

C) The variety and abundance of plant species in a region

D) Coastal formations

2. The Western Ghats in India are known for:

A) High mineral deposits

B) A rich diversity of plant and animal species

C) Deserts and arid zones

D) Low floral diversity

3. Which of the following is a significant factor influencing floral diversity in India?

A) Monoculture farming practices

B) Uniform climatic conditions

C) Diverse climate, topography, and soil types

D) Absence of wetlands

4. The Eastern Himalayas are classified as:

A) A barren region

B) A biodiversity hotspot

C) A desert biome

D) An urbanized zone

5. Conservation of floral diversity in India involves:

A) Reducing tree planting initiatives

B) Establishing national parks and biosphere reserves

C) Ignoring international conventions

D) Promoting deforestation

GS Mains Questions and Model Answers

Q1: Discuss the significance of floral diversity in maintaining ecological balance and supporting ecosystem services.

Answer: Floral diversity is vital for maintaining ecological balance by providing ecosystem services such as oxygen production, carbon sequestration, soil stabilization, water regulation, and nutrient cycling. Diverse plant species create complex food webs, offering habitats and sustenance for a wide range of fauna. High floral diversity enhances ecosystem resilience to climate change, disease outbreaks, and other disturbances, ensuring environmental stability. The presence of varied plant species also supports pollination, seed dispersal, and other crucial ecological functions, contributing to overall biodiversity and ecosystem health.

Q2: Explain the factors contributing to India's rich floral diversity and its regional distribution.

Answer: India's rich floral diversity is shaped by its diverse climate, topography, and varying soil types. The country hosts a wide range of ecosystems, from tropical rainforests in the Western Ghats and northeastern states to alpine vegetation in the Himalayas, dry deciduous forests in central India, and desert vegetation in the Thar Desert. India's geographic diversity, including mountain ranges, coastal areas, and river valleys, creates unique habitats for different plant species. This regional distribution reflects the adaptation of flora to specific environmental conditions, making India one of the world's most biodiverse regions.

Q3: Evaluate the challenges and strategies for conserving India's floral diversity.

Answer: The conservation of India's floral diversity faces challenges such as habitat loss due to deforestation, urbanization, overexploitation of resources, invasive species, climate change, and pollution. Strategies to address these challenges include establishing protected areas like national parks, wildlife sanctuaries, and biosphere reserves; promoting afforestation and sustainable land use practices; and community-based conservation initiatives. Policy measures, international agreements like the Convention on Biological Diversity (CBD), and raising public awareness about biodiversity conservation also play a critical role in preserving India's rich floral diversity.

Previous Year Questions on  Vertebrates

1. UPSC CSE 2020

Question: Discuss the role of biodiversity hotspots in the conservation of floral diversity, with reference to the Western Ghats and Eastern Himalayas.

Answer: Biodiversity hotspots like the Western Ghats and Eastern Himalayas play a critical role in conserving floral diversity by harboring a high number of endemic and rare plant species. These regions are characterized by unique ecosystems and microclimates that support diverse flora. Conservation of these hotspots is essential for preserving genetic diversity, protecting endangered species, and maintaining ecosystem services. Efforts such as establishing protected areas, promoting sustainable development, and involving local communities are crucial for the effective conservation of these regions. Preserving hotspots helps mitigate biodiversity loss and strengthens global environmental resilience.

2. UPSC CSE 2019

Question: Analyze the impact of deforestation and habitat fragmentation on India's floral diversity.

Answer: Deforestation and habitat fragmentation have a significant negative impact on India's floral diversity by leading to the loss of natural habitats, reducing plant populations, and disrupting ecological interactions. Fragmentation isolates plant species, limits gene flow, and increases vulnerability to extinction. It also affects ecosystem services such as water regulation, soil fertility, and carbon sequestration. Addressing these issues requires afforestation, habitat restoration, sustainable land use practices, and strict enforcement of environmental laws. Promoting community involvement and raising awareness about the value of biodiversity are essential for reversing the effects of deforestation and preserving India's rich floral heritage.