Sciencegajab

HUMAN REPRODUCTION 1. Human reproduces ➤SEXUALLY & VIVIPAROUS 2. Puberty is the time in life when a boy or girl becomes sexually mature. It is a process that usually happens between ages 10 and 14 for girls and ages 12 and 16 for boys. It causes physical changes, and affects boys and girls differently. 3. The REPRODUCTIVE EVENTS in human are : o Gametogenesis : production of sperm and ovum. o Insemination : It is transfer of sperm into female genital tract o Fertilization: Fusion of male and female gamete. o Implantation : Attachment of Blastocyst into uterine wall. o Gestation : Embryonic development. o Parturition : Delivery of baby. 4. THE MALE REPRODUCTIVE SYSTEM : o It is located in pelvis region. o It includes a pair of testes, accessory ducts, glands and external genitelia.  5. TESTES : o A pair of testes are located outside the abdominal cavity in a pouch called  SCROTUM . o The scrotum helps in maintaining the low temperature of the testes 2

  THE LIVING WORLD  1. Systematic and detail description of life forms              o Identification, nomenclature and classification. 2. ERNST MAYR  ‘The Darwin of the20th century’; Pioneered the currently accepted definition of a biological species. 3. CHARACTERSTICS OF A LIVING ORGANISM               GROWTH:         TWIN CHARACTERISTICS                  •Increase in mass and increase in number         A multicellular organism grows by cell division.         In plants, the growtUnlimited & Localised           In animals, the growth is Limited & Unlocalised           Unicellular organisms grow by cell division.          Growth of living organism is from inside.           Growth cannot be taken as a defining property of living organisms as non-livings also grow in mass.(by deposition; Outside) oREPRODUCTION Characteristic of living organisms. Fungi multiply through asexual spores. In lower organisms like yeast and hydra reproduce by budding.  In PLAN