difficult is my middle name !
A decrease in which factor normally causes transpiration rate to increase?
A humidity
B light intensity
C stomatal opening
D temperature
The table shows the rate of water flow through a tree over a 12 hour period.
What conclusion can be drawn from the table?
A Between 7:00 and 17:00 hours the rate of flow continuously increases.
B The greatest increase in rate of flow in a two-hour period is between 11:00 and 13:00 hours.
C Water does not flow up through a tree at night.
D Water flow is affected by humidity.
What is the correct path through the circulatory system which describes the passage of blood originating in the left leg?
A Vena cava → left atrium → right atrium → lungs → left ventricle → right ventricle → aorta
B Vena cava → right atrium → left atrium → lungs → right ventricle → left ventricle → aorta
C Vena cava → left atrium → left ventricle → lungs → right atrium → right ventricle → aorta
D Vena cava → right atrium → right ventricle → lungs → left atrium → left ventricle → aorta
A plant cell was placed in a concentrated sucrose solution . the diagram below shows the appearance of the cell after an hour in the solution .
what is the best description of this cell ?
turgid
flaccid
plasmolysed
wilted
what are the functions of xylem and phloem ?
xylem transports water and sugars , phloem transports mineral ions
xylem transports water and mineral ions , phloem transports sugars
xylem transports sugars and mineral ions , phloem transports water
xylem transports sugars , phloem transports water and mineral ions
The diagram shows a cross-section through the stem of a plant .
(a) identify the tissues labelled A,B and C .
(b) A young stem was placed in a solution of a red dye for an hour . Which tissue in the diagram would be most likely to contain the dye ? explain your answer .
which component of the blood makes antibodies ?
red blood cells
white blood cells
plasma
platelets
after a period of exercise , which blood vessel will contain the highest concentration of carbon dioxide ?
aorta
vena cava
hepatic artery
pulmonary vein
when the right ventricle contracts k, to which of the following structures does the blood flow next ?
aorta
left atrium
pulmonary artery
left ventricle
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