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Xam Idea Class 12 Biology Chapter 15 Solutions: Biodiversity & Conservation

Xam Idea Class 12 Biology Solutions for Chapter 15 ‘Biodiversity and Conservation’ is one of the efficient preparation guides that will assist you in your senior secondary exams as well as competitive exams. These solutions are designed in a systematic manner which will clear all your doubts on the chapter. You will be able to solve questions related to biodiversity patterns, species-area relationship, loss of biodiversity and latitudinal gradients. 

Xam Idea Class 12 Biodiversity and Conservation solutions have a total of 98 questions that is divided into four different categories. As you know biodiversity is very important for the maintenance of ecosystem stability. Our solutions will help you learn about three genetic components of biodiversity, species and ecosystem biodiversity. Moreover, you will also learn about how important it is to conserve biodiversity and how in different ways we can conserve our biodiversity. The various types of questions given in the exercises will enhance your ability to face all tricky and inherent questions. Going through all these questions will make you much aware of varied aspects of the chapter.

The Xam Idea Class 12 solutions offered by Instasolv for Biodiversity and Conservation assist you for answering questions that are asked in CBSE Class 12 exams. Our experts are well-acknowledged of the latest CBSE exam pattern and trends, thus they provide comprehensive solutions to each question in a very easy and understandable language.

Important topics of Xam Idea Class 12 Biology Solutions Chapter 15: Biodiversity and Conservation

Biodiversity mainly refers to a large variety of plants and animals that exist on earth. The socio-biologist Edward Wilson popularized the term “biodiversity”. Biodiversity and its conservation are important environmental issues on a global level as an increasing number of people across the world are starting to realize the importance of biodiversity for existence and planet well-being.

  • As per IUCN, the overall number of plant and animal species so far is around 1.5 million but still, so many species are yet to be discovered.
  • About more than 70% of overall species recorded are animals while others are plants including algae, bryophytes, angiosperms etc.
  • The number of fungal species present in the world is more than the combined total of species of fishes, mammals, reptiles etc.

It is mainly of three types

  • Genetic biodiversity: It depicts the total number of genes present in the genetic makeup of a species.
  • Species diversity: It is the total number of species present in the ecological community.
  • Ecological diversity: It is the greater diversity that is present in the ecosystem level in a specific area with all the deserts, rain forests etc.

Biodiversity pattern: Several patterns of biodiversity includes

  • Latitudinal gradients: The diversity of different species reduces towards the pole. There are several species present in the tropics as compared to the Polar Regions or the temperate region. It is because the tropical regions are undisturbed for many years and this has led to species diversification. The tropics environment is also consistent as well as predictable which is a strong reason there is more species diversity. Solar energy also enhances high productivity and assists in enhancing biodiversity in the tropics.
  • Species-Area relationship: The graph that exists between various species richness and the area for varied taxa is a rectangular hyperbola. On a logarithmic scale, the relationship is a straight line described by the equation

Log S = log C + Z log A   where,

S= Species richness

A= Area

Z = slope of the line (regression coefficient)

C = Y-intercept

Some ecologists have found out that the Z value lies between 0.1 to 0.2 no matter what is the region’s taxonomic group.

In a region when the explored area is enhanced the species richness also increases but it has a limit.

The vitality of species diversity to our ecosystem: Communities having more number of species are generally more stable as compared to communities with less number of species. In a stable community, there will be not much variation in productivity from year to year.

Rich biodiversity is required for ecosystem health and needed for the survival of the human race on this planet.

Biodiversity loss:

It generally leads to

  1. Destruction of plant production.
  2. Reduced resistance to all environmental problems like global warming, drought etc.
  3. High variation in ecosystem processes.
  4. Reasons behind biodiversity loss:
  5. Habitat thrashing and disintegration
  6. Overexploitation
  7. Alien species incursion
  8. Co-extinctions

Biodiversity Conservation

It is the protection, upliftment and proper management of biodiversity to reap impeccable benefits for both presents as well as upcoming generations.

The two methods of biodiversity conservation are

  1. In-Situ conservation involves protecting and conserving varied animals and plant species in its natural habitat. It mainly involves biosphere reserves, national parks, wild forests, hot spots and the sanctuaries.
  2. Ex-situ conservation: It mainly involves conservation and protection of the rare species of animals and plants outside of their natural habitats. This mainly involves aquariums, botanical gardens, zoos etc.

Important reasons for biodiversity conservation:

  • Human beings receive numerous economic advantages from nature like food, construction, firewood, medicines, fibre etc.
  • The Amazon forest offers about 20% of the overall atmospheric earth oxygen.
  • These are our biological legacies and should be passed on to our future generations.
  • Some of the pollinating agents in the co-system are birds, bees etc.

 Discussion of Exercises of Xam Idea Class 15 Biology Solutions Chapter 15: Biodiversity and Conservation

Xam Idea Class 12 Biology Solutions Chapter 15 posses a total of 98 questions divided into PYQ (past years questions) and OIQ (objective inventory questionnaires).

Very Short Answer Questions

  • This category consists of about 35 questions from which there are about 8 questions under PYQ category and 27 questions under the OIQ category. 
  • The questions require a very short one-line answer and mainly involve the basic concepts of the chapter like the level of biodiversity in India, the importance of cryopreservation, type of biodiversity, genetic diversity.

Short Answer Type Questions – I  

  • There are about 40 questions under this category which is further divided into PYQ category with 17 questions and OIQ categories with 23 questions. 
  • The whole question set covers all important aspects of the chapter like biodiversity use in modern agriculture, features that make a stable biological community, how ex-situ conservation helps, and fragmented habitat.

Short Answer Type Questions-II 

  • This category comprises about 12 questions with PIQ having 10 questions and OIQ with 2 questions. 
  • The questions are based on biodiversity conservation, rivet popper hypothesis, and a different approach to conservation.

Long Answer Type Questions

  • There are about 11 questions under this category with 6 questions under PYQ subcategory and 5 questions under the OIQ category. 
  • The questions are based on the tropic region with more species diversity, reasons behind loss of biodiversity, conservation of biodiversity. All of these questions need descriptive answers.

Why Use Xam Idea Class 12 Biology Solutions Chapter 15: Biodiversity and Conservation by Instasolv?

  • The Xam Idea solutions offered by Instasolv provide you with immense benefits while preparing for CBSE Class 12 exams and score high marks in exams.
  • Prepared by our team of experts it is a trustable source of information. All the experts make an effort to answer the questions keeping in mind all aspects of CBSE exam patterns and syllabus.
  • You can also refer to our solutions and form a solid understanding of biodiversity for medical entrance exams like NEET.