Water enters by osmosis due to high solute concentration in the phloem tube. Instead, excessive CO2 is removed through the lungs or other respiratory organ. Method Two test tubes containing limewater Ca OH 2 and universal indicator were prepared.
Colour changes and corresponding pH changes were observed. It also became more opaque. They allow movement of phloem sap. Hydrochloric acid and calcium carbonate were combined in a side-arm tube, with rubber tubing leading into one of the test tubes containing limewater. Transpiration — evaporation of water from stomates in leaves As water is lost through transpiration, water molecules from further down in the xylem are drawn up to replace this loss This is the initiation of the transpiration stream Cohesion — hydrogen bonding of water molecules are strong intermolecular forces Water molecules attract each other and pull each other up Adhesion — water molecules are attracted to the cellulose cell walls This force assists in pulling the water molecules up the xylem tubes Forces of cohesion and adhesion are together known as capillary action There is also root pressure, which contributes little to the transport of water.
More accurate, quantitative results could have been obtained using a calibrated pH probe. Nerves send messages to the breathing control centre in the medulla. Water pressure is now raised at this part of the tube.
Mineral ions may be actively taken up through the roots at night. This is known as guttation. At the sugar sink, where sugar is taken to be used and stored, sugar is actively unloaded. A straw was used to blow into the other test tube containing limewater. However, transpiration is low, so there is no transpiration stream to transport water and mineral ions up xylem.
Too much CO2 causes an increase in rate and depth of breathing Low levels of CO2 cause a decrease in rate and depth of breathing Describe current theories about processes responsible for the movement of materials through plants in xylem and phloem tissue The current theory is the transpiration-cohesion-adhesion mechanism.
This would create an overly acidic environment in which enzymes would denature and metabolic processes would be under-regulated. Exhaled air containing carbon dioxide was bubble through the limewater.
Identify data sources, plan, choose equipment or resources and perform a first-hand investigation to demonstrate the effect of dissolved carbon dioxide on the pH of water. Perform a first-hand investigation using a light microscope and prepared slides to gather information to estimate the size of red and white blood cells and draw scaled diagrams of each The use of a prepared slide prevented the spread of blood-borne diseases.
Whole blood donation — red blood cells, plasma and platelets are collected can be done every 12 weeks Plasma donation — plasma only is collected through apheresis where other blood components are returned to patient can be done every 2 weeks as red blood cells are returned Platelet donation — platelets only are collected through apheresis can be done every weeks as platelets are replaced within a few days Blood products include: In the s the HIV crisis triggered research into artificial blood, as suddenly natural blood transfusions could lead to fatal infections.
This is passive transport. This reaction would have taken place in plain water and also contributed to the lower pH.
The rate and depth of breathing are altered.Biology Notes – Module 1, Maintaining a Balance, by F.A 6 Figure – Summary of major variables that are subject to homeostasis in mammals Variable Normal Range Comments Temperature oC – oC Temperature of internal cells of the body is called the core temperature Blood glucose – mmol per L Blood glucose is.
Biology Study Notes HSC HSC TOPIC 1: Maintaining a Balance – Living with a limited temperature range Enzymes • Enzymes: o Are: Found in all living things (they are biological chemicals) Catalysts (changes the rate of a chemical reaction) Proteins.
- Maintaining a Balance: Most organisms are active within a limited temperature range: • Identify the role of enzymes in metabolism, describe their chemical. 1 Maintaining a Balance Science Press Surfing Biology Introduction Each book in the Surfing series contains a summary, with occasional more.
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