Exchanges of Substances with the Environment Random Retrieval

If a small tube is inserted into the phloem through the bark of a tree, sap containing sucrose leaks out. Where on the tree will the most sap leak from due to the highest hydrostatic pressure?

Which of the following is evidence against the mass flow hypothesis?

Which of the following is an example of a 'sink' ?

Which would not increase the volume of water transpired by the plant?

What term is used to describe the 'sticking' together of water molecules?

What has happened at position C?

What has happened at position A?

One of the phases of the cardiac cycle is called Atrial Systole. During Atrial Systole, what is happening in the heart during this phase?

This bar chart shows the risk of CVD with differing amounts of cigarettes smoked per day. Is there a significant difference in risk between smoking no cigarettes, and smoking 1 - 19 cigarettes a day?

Does this bar cart show a correlation between number of cigarettes smoked, and the risk of CVD?

Capillaries are made only out of one layer of cells called endothelium. Why is this?

Which type of blood vessel has the thickest muscular layer?

In which direction ( if any), would a curve be for diving seal haemoglobin?

Which number represents the layer where gaseous exchange happens in plants?

Tuberculosis (TB) is caused by bacteria infecting the lungs, where amongst other effects it reduces tidal volume. What happens to the ventilation rate of sufferers?

Which muscles are contracted when you inhale?

Multicellular organisms cannot absorb enough substances by diffusion. Why is this?

Cresol red is an indicator which goes clear at a low pH. A plate of agar jelly with cresol red added was made, and two blocks were cut out. Block A measured 10mm x 10mm x 10mm. Block B measured 20mm x 7mm x 7mm. You have chosen one which will decolourise the quickest, why did you choose that block?

Cresol red is an indicator which goes clear at a low pH. A plate of agar jelly with cresol red added was made, and two blocks were cut out. Block A measured 10mm x 10mm x 10mm. Block B measured 20mm x 7mm x 7mm. Which one will decolourise quickest when placed in an acidic solution ?

What is the volume of the same palisde cell measuring 100 µm by 40 µm?