CBSE 12th Biology

UNIT VI: Reproduction

Biology in essence is the story of life on earth. While individual organisms die without fail, species continue to live through millions of years unless threatened by na !ural or anthropogenic extinction. Reproduction becomes a vital process without which species cannot survive for long. Each individual leaves its progeny by as exu at or sexua I me a ns. S exua I mode of reproduction enables creation ofnewvarianls,so that survival advantage is enhartced. This unit examines the gerteral principles unde rtying reproductive processes in living orga nisrns and then explains the details of this process in flowering plants and humans as easy to relate representative examples. A related perspective on human reproductive health and how reproductive ill health can be avoided is also presented to complete our understanding of biology ofreproductiort.