Areas of land and/or sea, especially dedicated to the protection and maintenance of biological diversity, and of natural and associated cultural resources are protected areas. Some commercially important species are marine fishes are likely to become endangered because marine fish populations are being overharvested all over the world. All the others are prehuman times, this is anthropogenic. mammals, birds) and migrating animals are badly affected, leading to population declines. Biodiversity refers to the sum total of diversity that exists at all levels of biological organisation. The number of global species diversity is about 7 million according to Robert May and his conservative and scientific studies. UNIT 4. Forgot Nearly 22% account for the total plants (including algae, fungi, bryophytes, gymnosperms and angiosperms). Students who are in class 12th or preparing for any exam which is based on Class 12 Biology can refer NCERT Biology Book for their preparation. OTP, OTP has been sent to you on your mobile number. All Rights Reserved, Your account is your portal to all things, By Login, you agree to our Terms and Privacy Policies. All Chapters of Physics, chemistry & Maths are covered. It has clogged water bodies including wetlands at many placed resulting in the death of several aquatic plants and animals. The measure of variation in genetic information contained in the organisms is Genetic diversity. ○ Very high levels of species richness. Paul Ehrlich through Rivet popper hypothesis explained the effect of reduction in biodiversity. Hey Edubuzzer, welcome to the learning platform, EDUBUZZ NOTES. Please Resend In-situ conservation is of two types: hot spots and protected areas. In an aircraft (ecosystem) all components are joined collectively by using thousands of rivets (species). Degradation of many habitats by means of pollution has also threatened the loss of diversity. Biodiversity comprises of genetic variability and diversity of living forms like animal microbes, plants etc. Gametes of threatened species can be preserved in viable and fertile condition for long periods using cryopreservation techniques and plants can be propagated using tissue culture methods. The revision notes help you revise the whole chapter 15 in minutes. It is the most vital cause which drives animals and vegetation to extinction. The term ‘biodiversity’ was popularized by the sociobiologist Edward Wilson. Various examples of high diversity in tropical regions: About 1400 species of birds are found in Colombia located near the equator (tropical region). The term ‘Biodiversity’ was introduced by an American Biologist Edward Wilson. 3. Biodiversity and its conservation are important environmental issues of international concerns as it is of critical importance for our survival and well-being on this planet. India has 14 biosphere reserves, 90 national parks and 448 wildlife sanctuaries covering 4.7% of the land surface, as against 10% internationally suggested norm. Instead, we should take care of their wellbeing so to pass the rich biological legacy to future generations. IUCN Red List (2004) says that 784 species (338 vertebrates, 359 invertebrates & 87 plants) were extinct in the last 500 years. Nations with rich biodiversity are expected to reap enormous benefits. No comments: Post a … Kerala Plus Two Zoology Notes Chapter 8 Biodiversity and Conservation. The present-day extinction rate is 100 to 1000 times faster. Genetically uniform populations are highly prone to disease harsh environment. Different patterns in diversity are latitudinal, altitudinal, geographical, topographical, humidity gradients but most common is the latitudinal gradient in diversity. Already have an account? The key criteria for determining a hot spot are: Login, By filling this form C = Y-intercept. Types of Biodiversity: There are three interrelated hierarchical levels of biodiversity namely, genetic … Preserving global biodiversity is the most important strategic plan to protect biodiversity. Foll… CBSE Class 12 Biology Chapter 15 Biodiversity and Conservation Notes would provide you with an effective preparation for your examinations. Easy tips and tricks to solve numericals. (1) … Greater the genetic diversity among organisms of a species, more sustenance it has against environmental perturbations. ○ Oxygen: Plants are replenishing O2 of the atmosphere due to their photosynthetic activity. Biodiversity can be studied at Genetic diversity, Species diversity, Ecological/Ecosystem diversity. 2.Indo-Burma: Extending from Bhutan to Myanmar covering most of North-Eastern India. India is a homeland of 167 cultivated species and 320 wild relatives of crop plants. below, Want to update details? (iii) The World Summit on sustainable development was held in Johannesburg, South Africa in 2002, as a follow up in which 190 countries pledged their commitment to achieve by 2010. Password? World Conservation Center has recognized nearly 37000 protected areas. Biology Important Questions Class 12 are given below. Furthermore which rivet is eliminated may also be critical. Share to Twitter Share to Facebook Share to Pinterest. Litter and humus of plants act as a sponge retaining most of the rainwater. The biodiversity decreases as we move from low to high latitude i.e. The number of species per unit area is species richness, the number of individuals of different species represents species evenness or species equitability. surviving in a broad range of ecosystems. Biodiversity and its Conservation 12th Biology CBSE NCERT Chapter 15 Marketing along with videos,solved papers and worksheets.These are helpful for … ecosystems are undergoing changes. Biodiversity and conservation 1. Password? A = Area It is defined as“the variety and variability of living organisms and the ecological complexes in which they exist.” In other words, the term biodiversity refers to the occurrence of several ecosystems, different organisms, their species, along with the entire range of variants adapted to different environment, climate, etc. Amazon rainforest is estimated to produce 20% of it. Plants also increase the porosity of soil and thereby allow water to percolate down into the soil and then in the water table. Please provide the Phone Number you used when OTP, Terms and Back. The Notes cover all topics which provides the students a simple way to study of revise the chapter. The extinction of the parasite is due to the extinction of host species. It means we save the entire forest to save the tiger. Firewood: It is used as a source of energy for cooking and heating.

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