12.Brianna+Stuart

7th February, 2012.
 * Who is he?
 * What was his job?
 * What did he contribute to cell theory?[[file:biology.pptx]]
 * Why was his contribution so important?

Robert Brown: __Who is he?__ Robert Brown was a Scottish botanist and a Plant geographer, who was born on the 21st of Decemeber, 1773, in Montrose and died on the 10th of June 1858. He first studied medical studies at Edinburgh University in 1975. __What was his job?__ Robert Browns job involved being a botanist and a plant geographer. A Botanist is a scientist, who studdies plants flowers, and plant like things, such as moss and seaweed. Botany is also the scientific study of plants along with their growth, use, structure, and process in all forms of plant life. __What did he contribute to cell theory?__ Robert Brown contributed to the cell theory, with the discovery of the cell nucleus. As well as the first observation of Brownian Motion, the early work on plant pollination and fertilisation and also some studies in palynology. __Why was his contribution so important?__ Robert Browns contribution was so important because he had contributed to many different area's within the cell theory which he had discovered or observed himself.

Robert Hooke: __Who is he?__ Robert Hooke was an english physicist and an inventor in the 17th century. He was born on the 18th of July, 1635 and died on the 3rd of March 1703. Robert Hooke also attend Oxford University, and also introduced the word "cell", and was popular for his invention of the compound microscope. __What was his job?__ Robert Hooke's job had involved being a physicist and he was known as a inventor within the 17th century. __What did he contribute to cell theory?__ Robert Hooke contributed to the cell theory by being the first to formulate the theory of planetary, explore the behaviour of elastic materials and introduced the term "cell". Robert had also build the first 'Gregorian telescope'. __Why was his contribution so important?__ Robert Hooke's contribution was importantbecause he proved and invented things and theory's which had related to the cell theory. He was also well known for his book ' Micrographia' in 1665. Through Robert Hooke studies led him to having an enunciation of "Hooke's Law".

7 March 2012 This is also a protective mechanism as it is skin cell which are made up of a few layers,but main function is protection, and water proofing with oils. ||
 * __//Learning Prep://__** Using the internet students are to research each of part of the plant listed create a table to describe their function.
 * Root, Stem, Axillary bud, Leaf, Flower, Apical Bud, Photosynthetic tissue, Vascular tissue, Mesophyll tissue, Guard cells, Epidermal cells, Palisade mesophyll cells, Spongy mesophyll cells.
 * **Structure** || **Function** ||
 * Roots || Roots have four main functions. The main functions are the absorption of water and inorganic nutrients, anchoring of the plant body to the ground, storage of food and nutrients and to prevent soil erosion. ||
 * Stems || Stems have four main functions. The main functions are to support the elevation of leaves, flowers and fruits, transport of fluids between the roots and the shoots in the xylem and phloem, storage of nutrients and the production of new living tissue. ||
 * Axillary Buds || Evolves at the axel of a leaf on a plant and can become new stems. ||
 * Leafs || Physical platforms in which influence the process of photosynthesis. ||
 * Apical Buds || The apical bud of a plant is the primary growing point located at the tip of the stem. ||
 * Flowers || Flowers play a key role in pollination. Pollination is the transfer of pollen, which contains the male gamete, from the anther of a flower, to the stigma of the same or a different flower. ||
 * Vascular tissue || Conduct water and dissolved minerals. Conduct food and other organic substances. ||
 * Mesophyll tissue || Conduction of substances, Regulation of opening and closing of stomata and Photosynthesis ||
 * Guard cells || They help to regulate the rate of transpiration by opening and closing the stomata thus preventing excessive water loss. ||
 * Epidermal cells || Transparent to allow maximum light harvesting and protection.
 * Palisade mesophyll cells || Responsible for photosynthesis because they contain chloroplasts. ||
 * Spongy mesophyll cells || Together with the intercellular air spaces, allow for the interchange of gases ||
 * Photosynthetic tissue || Influence the natural reaction of photosynthesis consisting of chlorophyll. ||

1. What are radioisotopes used for in medicine? Radioisotopes are used in medicine to provide diagnostic information about the functioning of a person's specific organs, or to treat them. 2. provide 3 examples of a radioisotope and list where it is used. a. iodine 131 in medicine b. carbon 14 prehistoric findings c. radium 226 treating cancer 3.list the pros and cons of using radioisotopes in medicine. pros:useful in diagnosis, useful in treatment cons:can have negative side effects, contributes to demand of nuclear power