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Biodiversity and Conservation class 12 Notes Biology

Biodiversity: 1. Example, Genetic variation in the medicinal plant Rauwolfia vomitoria growing in different Himalayan ranges might be in terms of the potency and concentration of the active chemical reserpine that the plant produces. For example, the Western Ghats have a greater amphibian species diversity than the Eastern Ghats. For example, India with its deserts, rain forests, mangroves, coral reefs, wetlands, estuaries and alpine meadows has a greater ecosystem diversity.

It means, out of every 10 animals, 7 are insects on the earth. Biodiversity in India i Although India has only 2. This makes India one of the 12 megadiversity countries of the world. If this proportion.

Patterns of biodiversity indicate that the biodiversity is not uniform throughout the world because it is affected by: i Latitudinal gradients demonstrates the decrease in species diversity as we move away from the equator towards the poles. It homes 40, species of plants, 3, of fishes, 1, of birds, of mammals, of amphibians, of reptiles and of more than 1,25, invertebrates. The temperate regions were subjected to frequent glaciation in the past, but the tropics have remained undisturbed and hence, had evolved more species diversity.

Such constant environments promote niche specialisation and lead to a greater species diversity. Z values in the range of 0. For example, for fruit eating birds and mammals in the tropical forests of different continents, the slope is found to be 1. Importance of Species Diversity to the Ecosystem i According to ecologists, communities with more species tend to be more stable than those with less species. He also showed that increased diversity contributed to higher productivity.

But, it is enough to realise that rich biodiversity is not only essential for ecosystem health but imperative for the survival of the human race on this planet. Results of Loss of Biodiversity in a Region a Decline in plant production. Causes of Biodiversity Losses These are mainly four as given below. They are also named as The Evil Quartet. Examples, a Nile perch a large predator fish when introduced in Lake Victoria East Africa caused the extinction of an ecologically unique species of cichlid fish in the lake.

For example, if the host species becomes extinct, all those parasites exclusively found on it will also become extinct. In plant pollinator mutualism, extinction of one results in the extinction of the other. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.

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NCERT Solutions for CBSE Class 12 Biology ‒ Chapter 15: Biodiversity and Conservation

Download revision notes for Biodiversity and Conservation class 12 Notes and score high in exams. These are the Biodiversity and Conservation class 12 Notes prepared by team of expert teachers. The revision notes help you revise the whole chapter 15 in minutes. Revision notes in exam days is one of the best tips recommended by teachers during exam days. Biodiversity or biological diversity is the occurrence of different types of ecosystems, different species of organisms and their variant like biotypes, ecotypes and gene adapted to different climates and environments of different regions including their interactions and processes. This term was coined by Edward Wilson.


Biodiversity. Biodiversity Conservation. makes our country one of the 12 mega diversity countries of the world. Nearly 45, species of.


NCERT Solutions For Class 12 Biology Biodiversity and Conservation

With these solutions, students can easily understand the concepts involved in the questions of this chapter. Questions from this chapter are frequently asked in CBSE board exams and various competitive exams. How do ecologists estimate the total number of species present in the world? An estimation by researchers says that it is about seven millions. The total number of species present in the world is calculated by ecologists.

CBSE Class 12 Biology Revision Notes Chapter 15 - Biodiversity and Conservation

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NCERT Class 12 Biology Biodiversity and Conservation

These solutions for Biodiversity And Conservation are extremely popular among Class 12 Science students for Biology Biodiversity And Conservation Solutions come handy for quickly completing your homework and preparing for exams. Biodiversity is the variety of living forms present in various ecosystems. It includes variability among life forms from all sources including land, air, and water.

Class 12 Biology Chapter 15 revision notes online are prepared with the help of expert professionals who are updated with the latest edition of NCERT. Available in the form of PDF files, these can easily be downloaded from the online platform for free. Besides, students can fetch other related documents online through established educational platforms like Vedantu. Mock test papers, PQYP, sample papers, etc. Students can practice all of the papers for giving their best shot during examinations. Having know-how about the paper structure, pattern, type of questions, and important topics is a great help for preparations. Working on the following Class 12 notes Biodiversity and Conservation with the help of the revision plan will work wonders:.

Biodiversity: 1. Example, Genetic variation in the medicinal plant Rauwolfia vomitoria growing in different Himalayan ranges might be in terms of the potency and concentration of the active chemical reserpine that the plant produces. For example, the Western Ghats have a greater amphibian species diversity than the Eastern Ghats. For example, India with its deserts, rain forests, mangroves, coral reefs, wetlands, estuaries and alpine meadows has a greater ecosystem diversity. It means, out of every 10 animals, 7 are insects on the earth. Biodiversity in India i Although India has only 2. This makes India one of the 12 megadiversity countries of the world.

Ans: Three components of biodiversity are: a Genetic diversity b Species diversity c Ecological diversity. How do ecologists estimate the total number of species present in the world? Ans: Ecologists estimate the total number of species present in the world by comparing species richness of some exhaustively studied groups between any two regions tropics, temperate or polar regions. Species richness, as a measure of diversity, has been used by many ecologists.

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