Plants can reproduce two ways, via insects or the wind. Insect-pollinated flowers usually have bright colours and a scent to attract the insects while wind-pollinated plants are usually absent of both bright colours and scent. The flower is comprised of many different parts, each with a different function, it’s the organ of reproduction …
Made up from 4 different parts: Phloem fibres Phloem parenchyma Sieve tubes Companion cells The sieve tubes and companion cells are both involved with the mass flow hypothesis. Sieve Tubes Cell membrane broken down Fluid cytoplasm No vacuole No nucleus With the end of the sieve wall broken down it allows inter cellular movement. Translocation …
All living things can be grouped into five categories. This is called the five kingdom proposal and was introduced by Robert Whittaker in 1968 as a way to categorise all organisms. Living organisms are divided into five kingdoms: Prokaryotae Protoctista Fungi Plantae Animalia Prokaryotae Unicellular and Microscopic. Non-membrane bound (no nuclear membrane, no ER, no …
Digestion is the breaking down of chemicals in the body to a form that can be absorbed and used. Digestion begins, in mammals, with the saliva in the mouth. The Mouth This is the buccal cavity in a human and is where mechanical digestion and mastication (chewing) takes place. Saliva in the mouth consists of …
Respiration is a set of metabolic reactions and processes that take place with in the cells of organisms. It stores biochemical energy within adenosine triphosphate (ATP) molecules. There are two types of respiration, aerobic and anaerobic. Respiration is also the process of making ATP rather that breaking it down. ATP (Adenosine triphosphate) ATP is the …
Carbohydrates are made up of monosaccharides – which are with relatively small molecules used as building blocks. As well as monosaccarides other monomers like amino acids and nucleotides are also used as building-blocks for the larger polymer structures. Polymers are the larger structures, built from monomers, and include carbohydrates, proteins and nucleic acids. The diagram …
For more information on the cell membrane itself try the Cell Structure page. Diffusion Diffusion is the transport of molecules from a region of high concentration to a region of lower concentration. The rate of diffusion depends upon: Concentration Gradient – the higher the concentration gradient between the two regions the faster the rate of …
Read article →Transport Methods – Movement across cell membranes
Plasma Membrane The plasma membrane is a thin, permeable membrane which surrounds the cell. It controls any exchange in or out of the cell. The fluid mosaic model was suggested by S. J. Singer and G. L. Nicolson in 1972. They believed that the plasma membrane around cells was made up from a phospholipid …
Bacterial Diseases Salmonella Salmonella is a type of bacteria usually found within poultry eggs, unprocessed milk, meat and water. It is a rod-shaped gram-negative entrobacteria that causes typhoid fever. It was discovered by an American scientist named Dr. Daniel Salmon. It can cause: Diarrhoea, constipation Headaches Stomach cramps Nausea and vomiting Fever Possibility of blood …
All organisms need energy to survive, some get of these organisms get their energy from sun (like plants with photosynthesis) and others are able to get their energy from consuming other organisms. Organisms living in a particular area and any non-living conditions within the area are together treated as an ecosystem. Food Chain In all …
