Hydrostatic Pressure Gradients Phloem sap containing sucrose and other organic solutes moves through the sieve tubes down a hydrostatic pressure gradient This is known as the pressure-flow hypothes...
Sucrose Loading Mechanism Organic compounds such as sucrose are transported from source to sink through the phloem sieve tubes Sucrose is a disaccharide formed from a molecule of glucose and a mole...
Translocation Translocation is the biological term used to describe the transport of organic solutes in the phloem tissue The liquid that is being transported within the phloem can be referred to a...
Practical 7: Potometers & the Rate of Transpiration The effect of environmental factors on the rate of transpiration in plants can be measured using a piece of equipment called a potometer Note...
Drawing Xylem Vessels The internal structure of plants can be examined by taking transverse sections of different parts of a plant, including the leaves, stem and roots Note that cross sections can...
Adaptations of Xerophytes Plants that live in conditions with a plentiful supply of fresh water have leaves with a short diffusion distance through to the stomata and a large surface area provided ...
Active Transport of Minerals in the Roots Within a plant, mineral ions are dissolved in water and transported in the xylem vessels Mineral ions needed by plants include nitrates, phosphates, and po...
Water Transport Within The Xylem The transport of water occurs in xylem vessels, one of the vascular tissues found within plants The cohesive property of water, together with the structure of the x...
Transpiration & Gas Exchange The majority of photosynthesis takes place in the leaves of plants Some plants are able to carry out photosynthesis in the cells of their stems During photosynthesi...
Skills: Annotating Chloroplasts Electron micrographs may differ in shape and size depending on where the cross section of the organelle was taken Usually the following features should be notable an...
Chloroplast Structure & Function Structure Chloroplasts are the organelles in plant cells where photosynthesis occurs These organelles are roughly 2 - 10 μm in diameter (they are larger than mi...
Investigating Carbon Fixation in Photosynthesis NOS: Developments in scientific research follow improvements in apparatus: sources of 14C and autoradiography enabled Calvin to elucidate the pathway...
