biology - Pest and Pest Control, Techniques in Agriculture

May 20th, 2015
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In the 17th and 18th centuries the first systematic attempts were made to study and control pests. Before this time, handpicking and spraying were the usual methods of pest control. In the 19th century, poisons of various types were developed for use in sprays, and biological

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BiologyWelcome to the GCSE Biology revision section. Click on the links below to see resources for Cell Activity, Genetics and DNA, Green Plants as Organisms, Humans as Organisms, Living Things in their Environment and Polymerisation of Amino Acids. These resources are constantly being added to. Cell ActivityPlant Cells vs. Animal CellsBoth types of cell have these: - Nucleus - Cytoplasm - Cell membrane - Mitochondria (Energy is released here by respiration) Only plant cells have these: - Cell wall - Large vacuole - Chloroplasts Specialised CellsRoot hair cell in Plants: It is adapted to do its job of taking in water and nutrients by having: - a large surface area - a thin cell membrane The Sperm cell is an example of a specialised animal cell:Red Blood Cell - Carries oxygen around the body Adaptations: No nucleus, large surface area, so maximum area for oxygen carriers: haemoglobin White Blood Cell Fight disease, some make antibodies Adaptations - Irregular shape, they can change shape to squeeze out of blood vessels and get to the site of infection. Others have cytoplasm which can flow making it possible for the cell to change shape, surround and engulf bacteria. Can increase in numbers to fight disease. Cells, Tissues, Organs and SystemsAll living things are made up of Cells A group ofCells e.g. Heart Muscle makes up a Tissue e.g. Heart Muscle Tissue A group of Tissues makes up an Organ e.g. HeartA group of Organsmakes up a System

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