CONTENT+FOR+THE+RETAKE+EXAM+SECOND+TERM

__**Content for the retake exam. Natural Science 2 year. Second Term**__ **Unit 4. Reproduction** .- Advantages and disadvantages of sexual and asexual reproduction. Page 48 .- Fragmentation, stolons and tubers. Page 50 .-Parts of a typical flower. Types of pollination. Page 52 .- Formation of the seed and the fruit. Page 54 .- Differences between budding and fragmentation. Page 56 .- Types of fertilization and types of embryonic development. Page 57 and 58 **Unit 5.- Ecosystems** .- Definition of Ecosystem, biotope, biocenosis. Page 64 .- Differences types of interspecific and intraspecific relationships. Page 68, 69 .- Food chain, food web. Page 70 **Unit 6. The Earth´s Structure** .- Definition of continental platform, abyssal plain, ridge and trench