Biodiversity and Conservation — DU B.Sc. (Hons.) Environmental Science Previous Year Question Papers

.: Biodiversity and conservation : B.Sc. alons.) Environmental 1. Write short notes on any three of the following : (a) Tree of life and evolutionary history (b) Evenness. and abundance (c) Ecosystem services: nutrient cycling and climate regulation (d) IUCN Red List categories 2. Differentiate between any three of the following : (a) Natural vs. anthropogenic disturbances (b) National Parks vs. Wildlife Sanctuaries (c) Gene banks vs. Seed banks (d) Density vs. Frequency in Biodiversity Surveys 3. (a) Describe the geographic time scale and its role in understanding organic evolution. (10) (b) How many species are estimated on Earth? Mention the basis of estimation. (5) 4. (a) Explain molecular techniques used in biodiversity estimation. (10) (b) What is the significance of a molecular database? 5. (a) Discuss the consequences ofbiodiversity loss on ecosystem functioning. (1'0) (b) What is invasive species threat? Provide one example. ~ (5) 6. Describe different strategies to restore biodiversity at ecosystem levels. (15)