1 comments Labels: Class 11 Biology MCQ, NEET Biology. (iv) Co-extinctions: If two species are in obligatory relationship the extinction of one species affect the other. 2. India has more than 50,000 genetically different strains of rice, and 1,000 varieties of mango. Ans. Indian land area occupies 2.4 per cent of the world’s land area and possess 8.1 per cent of global species diversity. It is through in situ (on site) conservation and ex situ (off site) conservation In situ conservation: Some areas of country are identified as ‘biodiversity hotspots’ These region shows high species richness and high degree of endemism. This 5-day unit covers topics in biodiversity, biogeography, and conservation biology. There are two ways of conservation of biodiversity-. Pollination is another ecosystems service by bees, bumblebees, birds and bats. Nearly 45,000 species of plants and twice as many of animals have been recorded from India. Tropics harbor more species than temperate or polar areas. 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. For example the Rauwolfia vomitoria growing in different Himalayan ranges shows the genetic variation i.e due to the concentration of the active chemical (reserpine) that the plant produces. Magnitude of biodiversity. There are about 45,000 species of plants and about 90,000-1,00,000 species of animals. MCQ Questions for Class 12 Biology: Ch 15 Biodiversity and its conservation Abhishek 06 Oct, 2020 MCQ Questions for Class 12 Biology: Ch 15 Biodiversity and its conservation The stable community shows much variation in productivity from year to year; they are resistant to disturbances and spreading of foreign species. It was noticed that the disappearance of 27 species in recent days. Initially designed for Advanced Placement Environmental Science high school students, the overall concept can also be easily adapted to non-AP courses. Biodiversity and Conservation - PowerPoint presentation for class 12/Plus 2/CBSE Biodiversity and Conservation PPT PDF Part 1 Biodiversity and Conservation PPT PDF Part 2 Biodiversity and its Conservation 12th Biology CBSE NCERT Chapter 15 Marketing along with videos,solved papers and worksheets.These are helpful for … Here we have given Plus Two Zoology Notes Chapter 8 Biodiversity and Conservation. (i) Genetic diversity: It is diversity at the genetic level. The overexploitation of marine fish populations leads to the reduction of commercially important species. For example, the Western Ghats have a greater amphibian species diversity than the Eastern Ghats. Topics Covered in NCERT Class 12 Revision Notes Biology Chapter 15 Solution. Preserving global biodiversity is the most important strategic plan to protect biodiversity. Some examples of recent extinctions include the dodo (Mauritius), quagga (Africa), thylacine (Australia), Steller’s Sea Cow (Russia) and three subspecies (Bali, Javan, Caspian) of tiger. Introduction of African catfish Clarias gariepinus for aquaculture purposes is a threat to the indigenous catfishesin river. Biodiversity can be conserved by the following two methods: In situ conservation – It involves the protection and conservation of a variety of animals and plant species in its natural habitat. Many marine fish population are over harvested, endangering the continued existence of some important species. Plus Two Zoology Notes Chapter 8 Biodiversity and Conservation is part of Plus Two Zoology Notes. According to IUCN (2004), the total number of plant and animal species described is slightly more than 1.5 million. The relationship between species richness and area for a number of taxa like angiospermic plants, fresh water fishes and birds is found to be a rectangular hyperbola. The reason for the greatest biodiversity in tropics. CBSE Class 12 Biology Notes Chapter 15 Biodiversity and its Conservation. Each topic is explained in very easy language with colored diagrams. (3) Ethical: Every species has an intrinsic value so they are conserved for future generations. This term was coined by Edward Wilson. The term ‘Biodiversity’ was introduced by an American Biologist Edward Wilson. How do we conserve Biodiversity? How Many Species are there on Earth and How Many in India? For example, the different type of ecosystems within India are deserts, rain forests, mangroves, coral reefs, wetlands, estuaries. Try watching this video on www.youtube.com, or enable JavaScript if it is disabled in your browser. Read More. Class 12 Biology Biodiversity and Conservation Introduction In our biosphere immense diversity (or heterogeneity) exists not only at the species level but at all levels of biological organization ranging from macromolecules within cells to biomes. Give three hypothesis for explaining why tropics ’”show greatest levels of species richness. The introduction of weed species like carrot grass (Parthenium), Lantana and water hyacinth (Eicchomia) seriously affected the land and aquatic population respectively.