All questions of Biodiversity and its Conservation for NEET Exam

Clarias Gariepinus

7 million !!!

Giant panda

Species diversity as we move away from the equator towards the poles

Introduction:
Species diversity refers to the variety of species within a given area. It is influenced by various factors, including climate, habitat complexity, and evolutionary history. One important pattern observed in species diversity is the change in diversity as we move away from the equator towards the poles.

Explanation:

1. Latitudinal Gradient:
- The latitudinal gradient in species diversity is a well-documented pattern in ecology.
- Generally, species diversity tends to decrease as we move away from the equator towards the poles.
- This means that there are typically more species in tropical regions near the equator and fewer species in polar regions.

2. Factors influencing species diversity:
- Several factors contribute to this latitudinal gradient in species diversity.
- Firstly, the equatorial regions receive more sunlight and have a more stable climate, allowing for higher primary productivity and more diverse habitats. This leads to the presence of a greater number of niches and a higher number of species.
- Secondly, the tropics have a longer evolutionary history, which has allowed for the accumulation of more species over time.
- Thirdly, the tropics provide more stable conditions for species survival, reducing the risk of extinction.
- In contrast, the polar regions have harsher and more unpredictable climates, with shorter growing seasons and lower primary productivity. These factors limit the number of species that can survive in these regions.

3. Biodiversity hotspots:
- Biodiversity hotspots are areas with exceptionally high species richness and endemism.
- Many biodiversity hotspots are found in tropical regions near the equator, such as the Amazon rainforest and the Coral Triangle.
- These hotspots support a diverse array of species, including plants, animals, and microorganisms.

Conclusion:
In conclusion, species diversity generally decreases as we move away from the equator towards the poles. This pattern is influenced by factors such as climate, habitat complexity, and evolutionary history. Understanding these patterns in species diversity is crucial for conservation efforts and maintaining the overall health and functioning of ecosystems.

Organisms Protected by the Bishnoi Community of Rajasthan

The Bishnoi community of Rajasthan is known for its deep-rooted traditions and religious beliefs that emphasize environmental conservation and protection of wildlife. They have been actively involved in safeguarding various organisms and habitats from harm. Two key organisms that are protected by the Bishnoi community are the Prosopis cineraria tree and the Black buck.

1. Prosopis cineraria:
The Prosopis cineraria, commonly known as the Khejri tree, is a native species to the arid regions of Rajasthan. It holds immense importance in the lives of the Bishnoi people. They consider the Khejri tree as sacred and worship it as part of their religious rituals. The Bishnoi community has been actively involved in the conservation and protection of this tree species for centuries. They believe that cutting down a Khejri tree is equivalent to killing a person from their own community. The Bishnoi community has played a significant role in preventing the indiscriminate felling of Khejri trees and raising awareness about their ecological importance.

2. Black buck:
The Black buck (Antilope cervicapra) is a species of antelope found in the Indian subcontinent, including the arid regions of Rajasthan. It is known for its distinctive black coat and spiraled horns in males. The Bishnoi community holds the Black buck in high regard and considers it a symbol of grace, beauty, and peace. They have a deep connection with this species and have taken several measures to protect it from hunting and poaching. The Bishnoi community has historically resisted the killing of Black bucks and has even sacrificed their lives to protect them. They have set up sanctuaries and conservation areas to provide a safe habitat for these animals.

Conclusion:
The Bishnoi community of Rajasthan plays a crucial role in the conservation and protection of various organisms, especially the Prosopis cineraria tree and the Black buck. Their religious beliefs and deep-rooted traditions guide their commitment to environmental conservation. Through their collective efforts, the Bishnoi community has successfully contributed to the preservation of these species and their habitats, ensuring a sustainable future for both nature and mankind.

Understanding Natural Extinction
Natural extinction refers to the gradual and ongoing process of species disappearing from the Earth, primarily due to natural factors rather than human influence. Let's break down the statements:
Statement Analysis
- (i) Extinctions abetted by human activities: This statement describes anthropogenic (human-caused) extinctions, not natural extinction. Thus, it is incorrect in this context.
- (ii) Slow replacement of existing species: Natural extinction often involves a gradual process where older species are replaced by newer ones through evolutionary processes. This statement is true.
- (iii) Also known as background extinction: Background extinction is the term used to describe the normal rate of extinction that occurs in the absence of human influence. This statement is true and identifies natural extinction accurately.
- (iv) A small population is most likely to be extinct: Smaller populations are indeed more vulnerable to extinction due to factors like genetic drift, inbreeding, and environmental changes. This statement is also true.
Conclusion
From the analysis, statements (ii), (iii), and (iv) accurately describe aspects of natural extinction. Therefore, the correct answer is option 'C', which includes these three statements:
- Slow replacement of existing species
- Also known as background extinction
- A small population is most likely to be extinct
Understanding these principles is crucial for grasping ecological dynamics and conservation efforts in the context of biodiversity and extinction rates.

B) as plants have evolved earlier on the earth than animals and as plants are autotrophs ( they can produce their own food with the help of inorganic substances) plants are therefore found mostly in every part of the eart and outnumber animal species which depends on plants to get their foods,,

Bioprospecting
Bioprospecting refers to the exploration of biodiversity for new resources, such as medicinal plants or compounds. While bioprospecting can lead to valuable discoveries, it is not a broadly utilitarian argument for the conservation of biodiversity. This is because bioprospecting focuses on the potential benefits that humans can derive from biodiversity, rather than considering the intrinsic value of biodiversity itself.
Pollination
Pollination is a key ecosystem service provided by biodiversity. Many plants rely on pollinators to reproduce, and without them, food production would be severely impacted. By conserving biodiversity, we ensure that pollinators continue to thrive and support agricultural systems.
Aesthetic Value
The aesthetic value of biodiversity is another important reason for conservation efforts. Many people derive joy and inspiration from the beauty of nature, whether it's through observing diverse plant and animal species or exploring natural landscapes. Preserving biodiversity allows for future generations to experience and appreciate the wonders of the natural world.
Climatic Regulation
Biodiversity plays a crucial role in regulating the Earth's climate. Forests, for example, act as carbon sinks, absorbing carbon dioxide from the atmosphere and helping to mitigate climate change. By protecting biodiversity, we can maintain these important ecosystem functions and contribute to global efforts to address climate change.
In conclusion, while bioprospecting focuses on human-centric benefits, the broader utilitarian argument for the conservation of biodiversity includes pollination, aesthetic value, and climatic regulation as key reasons for preserving the diversity of life on Earth.

Introduction:
The question asks about the number of plant and animal species that have been discovered and described so far. The correct answer is option 'A', which states that 1.5 million species have been discovered and described.

Explanation:
Here is a detailed explanation of why option 'A' is the correct answer:

1. The Known Species:
- Scientists estimate that there are approximately 8.7 million species of plants and animals on Earth.
- However, the exact number is difficult to determine as new species are constantly being discovered, and some may become extinct before they are even identified.

2. Discovery and Description Process:
- Discovering and describing a new species is a complex and time-consuming process.
- Scientists rely on various methods, including fieldwork, DNA analysis, and museum collections, to identify and describe species.
- This involves studying the physical characteristics, behavior, habitat, and genetic makeup of the organisms.

3. Cataloging and Classification:
- Once a new species is discovered and described, it is cataloged and classified into the existing taxonomic system.
- The taxonomic system organizes species into groups based on their evolutionary relationships and shared characteristics.
- This helps scientists understand the diversity of life and how different species are related to each other.

4. Number of Described Species:
- As of now, scientists have described and named approximately 1.5 million species of plants and animals.
- This includes both terrestrial and marine species from various regions around the world.
- The number of described species is constantly increasing as new discoveries are made and existing species are better understood.

5. Unexplored Biodiversity:
- Despite the progress made in discovering and describing species, there is still a vast amount of biodiversity that remains unexplored.
- Many regions, especially in tropical rainforests and deep oceans, are still relatively unexplored, and countless new species are waiting to be discovered.

Conclusion:
In conclusion, the number of plant and animal species that have been discovered and described so far is approximately 1.5 million. However, this represents only a fraction of the estimated 8.7 million species on Earth. The process of discovering and describing species is ongoing, and scientists continue to explore and catalog the Earth's biodiversity.

The correct answer is option 'D', which states that selective hunting of dangerous and threatening species is not an objective of the Convention on Biological Diversity (CBD). The CBD is an international treaty that aims to promote the conservation and sustainable use of biodiversity, as well as the fair and equitable sharing of benefits arising from the utilization of genetic resources.

The Convention on Biological Diversity (CBD) was adopted in 1992 during the Earth Summit in Rio de Janeiro, Brazil. It has three primary objectives:

1. Conservation of Biodiversity:
The CBD seeks to conserve biodiversity, which refers to the variety of life on Earth, including ecosystems, species, and genetic diversity. It recognizes the intrinsic value of biodiversity and the need to maintain its ecological integrity. The conservation objective focuses on protecting and preserving natural habitats, ecosystems, and species to ensure their long-term survival.

2. Sustainable Use of Biodiversity:
The CBD promotes the sustainable use of biodiversity, which involves utilizing natural resources in a way that maintains their availability for future generations. It recognizes that human activities, such as agriculture, forestry, fisheries, and tourism, can have an impact on biodiversity. Therefore, the CBD encourages the adoption of sustainable practices that minimize negative impacts and ensure the continued provision of ecosystem services.

3. Fair and Equitable Sharing of Benefits:
The CBD emphasizes the fair and equitable sharing of benefits arising from the utilization of genetic resources. Genetic resources are the heritable material of plants, animals, and microorganisms that have potential value for human use. The CBD recognizes that the conservation and sustainable use of biodiversity should be accompanied by the fair and equitable sharing of the benefits derived from accessing and utilizing these resources. This objective aims to ensure that countries and communities that hold genetic resources are fairly compensated for their contribution to scientific research, innovation, and commercialization.

Selective hunting of dangerous and threatening species, as mentioned in option 'D', does not align with the objectives of the CBD. The Convention focuses on conservation, sustainable use, and benefit-sharing rather than promoting hunting practices that may endanger species or disrupt ecosystems. The CBD aims to protect biodiversity as a whole and promote the long-term sustainability of ecosystems and the services they provide to humanity.

Understanding Co-extinction
Co-extinction refers to the phenomenon where the extinction of one species leads to the extinction of another species that is dependent on it for survival. This relationship is often obligatory, meaning that the dependent species cannot survive without the host or partner species.
Key Aspects of Co-extinction:
- Obligatory Relationships: Many species have evolved in close association with one another, such as parasites and their hosts, or pollinators and the plants they pollinate. When one species in these relationships goes extinct, the other often follows.
- Examples in Nature:
- Pollinators: Certain plants rely on specific insects for pollination. If the insect becomes extinct, the plant may also die out due to lack of reproduction.
- Parasites and Hosts: Parasites may not survive if their host species becomes extinct, leading to a cascade effect in the ecosystem.
- Biodiversity Impact: Co-extinction contributes significantly to biodiversity loss. The interconnected web of life means that the loss of one species can have a ripple effect, threatening multiple other species.
- Conservation Significance: Understanding co-extinction highlights the importance of conserving entire ecosystems rather than focusing on individual species. Protecting keystone species can help maintain the balance and health of the community.
Conclusion:
In summary, co-extinction underscores the complex interdependencies within ecosystems. The extinction of one species can trigger a chain reaction, leading to the decline of other species that rely on it. This phenomenon emphasizes the need for comprehensive conservation strategies to protect biodiversity effectively.

Protection in a National Park

National parks are designated areas that are set aside for the conservation and preservation of natural resources and biodiversity. These parks aim to protect and sustain the entire ecosystem, including both flora and fauna. Let's explore why protection is provided to the entire ecosystem in a national park.

Preservation of Biodiversity
- National parks are established to protect and preserve the rich biodiversity found within their boundaries. Biodiversity refers to the variety of plant and animal species, as well as the ecosystems in which they exist.
- By providing protection to the entire ecosystem, national parks ensure the conservation of a wide range of species and habitats. This helps to maintain the balance and functioning of natural systems.

Interconnectedness of Flora and Fauna
- Flora and fauna are interconnected components of an ecosystem. Plants provide the necessary habitat, food, and resources for animals, while animals help in pollination, seed dispersal, and nutrient cycling for plants.
- By protecting both flora and fauna, national parks ensure the sustainability of these ecological interactions and the overall health of the ecosystem.

Conservation of Endangered Species
- Many national parks are home to endangered or threatened species. These species are at risk of extinction due to various factors such as habitat loss, poaching, and climate change.
- By providing protection to the entire ecosystem, national parks offer a safe haven for these species, allowing them to thrive and recover their populations. This is crucial for the long-term survival of endangered species.

Preservation of Ecosystem Services
- Ecosystem services are the benefits that humans derive from the natural environment. These include clean air and water, climate regulation, soil fertility, and recreational opportunities.
- By protecting the entire ecosystem, national parks ensure the preservation of these valuable ecosystem services. This benefits both present and future generations by maintaining the quality of the environment and supporting human well-being.

Educational and Research Opportunities
- National parks also serve as outdoor classrooms and research sites, providing opportunities for scientists, students, and the general public to learn about and study the natural world.
- By protecting the entire ecosystem, national parks offer a diverse range of research subjects and educational resources, enhancing our understanding of ecology, conservation, and sustainable management practices.

In conclusion, protection is provided to the entire ecosystem in a national park to preserve biodiversity, maintain ecological interactions, conserve endangered species, sustain ecosystem services, and facilitate education and research. By safeguarding both flora and fauna, national parks play a vital role in ensuring the long-term health and sustainability of our natural resources.