AS Biology F211 All Past Paper Questions

These are all the questions ever asked on the Unit 1 AS OCR Biology. This would be very useful for exam practice! 

I hope it helps! 

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1. State the maximum magnification that can be achieved by a light microscope and a
transmission electron microscope.
Select your answers from the list below.
10x 40x 100x 400x 1500x 25 000x 50 000x 500 000x
light microscope ................................... x
transmission electron microscope ................................... x
[Total 2 marks]
2. Describe what is meant by the term resolution.
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[Total 2 marks]
3. The figure below is an electron micrograph of xylem tissue in the stem of a plant.
pit
spiral band
Harris Academy South Norwood 1

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State one function of xylem tissue.
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[1]
(ii) The spiral band in the xylem vessel shown in the figure above contains a
substance called lignin.
State the function of this spiral band of lignin and explain why it is important that
the xylem vessel becomes lignified in this way.
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(iii) Explain the function of the pits seen in the figure above.
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Explain what is meant by the term tissue.
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(ii) Name one type of epithelial tissue found in the lungs.
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[Total 3 marks]
5. Explain why the lungs can be considered to be an organ.
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In the lungs, goblet cells secrete mucus. The mucus is then moved by cilia.
Name one cellular structure from the list below that is associated with each of the
following functions. You must select a structure once only.
mitochondria ribosome Golgi vesicle centriole nucleus cytoskeleton
(i) release of energy .......................................................................................
(ii) movement of cilia .......................................................................................
(iii) secrete mucus ............................................................................................
[Total 3 marks]
7. Complete the passage below.
Membranes have a variety of functions in cells. All membranes are .......................
permeable.…read more

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Membranes contain a variety of proteins. Some of these proteins are combined with
carbohydrates to form glycoproteins.
Describe the functions of glycoproteins in the cell surface membrane.
In your answer you should use appropriate technical terms, spelt correctly.
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The figure below shows a potometer, a piece of apparatus used for estimating the rate
of transpiration.
leafy shoot
water
reservoir
capillary tube screw
clip
air-water rubber tubing
meniscus
(a) State one essential component of the apparatus, not shown in the figure above,
that must be added before any results can be recorded.
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[1]
(b) Describe three steps a student should take when setting up the potometer to
ensure that the apparatus works correctly.
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A student used the apparatus shown in the figure above to investigate how
transpiration rates vary during the day. The student placed the potometer on a
window ledge in the laboratory and estimated the rate of transpiration four times
during the day.
The results are shown in the table below.
time of day rate of transpiration (arbitrary units)
replicate 1 replicate 2 replicate 3 mean
10.00 32 29 31 30.7
12.00 37 35 38 36.7
14.00 23 26 25 24.7
16.…read more

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Suggest two possible reasons, other than light and temperature, why the
rate of transpiration was lower in the afternoon than in the morning.
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(iv) Explain why the potometer only gives an estimate of the rate of
transpiration.
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[Total 11 marks]
10. (i) The figure below represents a transverse section of an artery and a vein.
Draw a line to show the relative position of the endothelium of the vein.…read more

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State two other ways in which the wall of an artery is different from the wall of a
vein.
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[Total 3 marks]
11. (i) Blood in the arteries has a high hydrostatic pressure.
State how this hydrostatic pressure is generated in the heart.
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(ii) Explain why the hydrostatic pressure of the blood drops as blood moves away
from the heart.
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Capillaries have walls that are one cell thick.
The figure below shows how the hydrostatic pressure of the blood changes as it
moves through a capillary.
The figure below also shows the water potential of the blood, due largely to the
plasma proteins, which tends to move water into the blood.…read more

Comments

DARCY NEWMARK

pleaaaaase repost it!!! would be very helpful 

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