CHAPTER 10 PHOTOSYNTHESIS AND RESPIRATION PHOTOSYNTHESIS photo light

CHAPTER 10 PHOTOSYNTHESIS AND RESPIRATION

PHOTOSYNTHESIS “photo” – light “synthesis” – to put together Process of a cell catching sunlight and using it to make food. All living things depend on energy that is captured during photosynthesis

Photosynthesis Cont. Performed by organisms that make their own food – AUTOTROPHS We are HETEROTROPHS – organisms that cannot make their own food

Photosynthesis Cont. Autotrophs use energy from the sun to convert carbon dioxide and water into GLUCOSE and oxygen.

Photosynthesis Cont. The sugars that are produced are used in cells for energy. It can be stored or used to make other compounds

CELLULAR RESPIRATION Process of breaking down simple molecules such as glucose (sugar) and releasing the energy they contain. Energy is glucose is transferred to Adenosine Tri-phosphate (ATP). Cells use ATP as its energy currency

Cellular Respiration Cont.

Photosynthesis and Cellular Respiration are the opposite of each other – These keep the levels of oxygen and carbon dioxide constant

MITOSIS Cells dividing into two identical cells -needed for growth and repair

Mitosis

Meiosis Process of producing gametes (sex cells) – Sperm and Egg Reduces the amount of DNA each cell has – Normal human cells have 46 chromosomes – Sex cells contain 23 (23 + 23 = 46)

Meiosis