AQA, OCR, Edexcel A Level A Level Biology

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AQA, OCR, Edexcel

A Level A Level Biology

Photosynthesis, Respiration Succession and Nutrient Cycle Questions

Name:

Total Marks:

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Visit for more fantastic resources. Q1. The diagram shows the energy flow through a freshwater ecosystem. All units are kJ

m?2year?1.

(a) Name (i) process A; .............................................................................................................(1) (ii) the group of organisms represented by box B. .............................................................................................................(1)

(b) Calculate the percentage efficiency with which light energy is transferred to energy in producers. Show your working.

Answer ........................................ (2)

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Visit for more fantastic resources. S (c) Describe the effect of light energy in the light-dependent reaction of photosynthesis.

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......................................................................................................................

......................................................................................................................(2)

S (d) If a plant is kept in the dark it is still able to produce carbohydrates, as long as it is provided with two products of the light-dependent reaction of photosynthesis. Give the name of these products and explain their function in the light-independent reaction of photosynthesis.

Name ............................................................................................................

Function ........................................................................................................

......................................................................................................................

Name ............................................................................................................

Function ........................................................................................................

......................................................................................................................(4) (Total 10 marks)

Q2.

Scientists investigated the effects of temperature and light intensity on the rate of

photosynthesis in creeping azalea. They investigated the effect of temperature on the net

rate of photosynthesis at three different light intensities. They also investigated the effect

of temperature on the rate of respiration. The graph shows the results.

(a) (i)

Name the factors that limited the rate of photosynthesis between X and Y. .............................................................................................................(1)

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Visit for more fantastic resources. (ii) Use information from the graph to explain your answer. ............................................................................................................. ............................................................................................................. ............................................................................................................. ............................................................................................................. .............................................................................................................(2)

(b) Use information from the graph to find the gross rate of photosynthesis at 20?C and medium light intensity.

Answer ..................................................... (1)

(c) Creeping azalea is a plant which grows on mountains. Scientists predict that in the area where this plant grows the mean summer temperature is likely to rise from 20 ?C to 23 ?C. It is also likely to become much cloudier. Describe and explain how these changes are likely to affect the growth of creeping azalea. ...................................................................................................................... ...................................................................................................................... ...................................................................................................................... ...................................................................................................................... ...................................................................................................................... ......................................................................................................................(3) (Total 7 marks)

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Visit for more fantastic resources. Q3.Chloroplasts contain chlorophyll a and chlorophyll b. Scientists found tobacco plants with a

mutation that caused them to make more chlorophyll b than normal tobacco plants. They investigated the effect of this mutation on the rate of photosynthesis. The scientists carried out the following investigation. ? They grew normal and mutant tobacco plants. They grew some of each in low light

intensity and grew others in high light intensity. ? They isolated samples of chloroplasts from mature plants of both types. ? Finally, they measured oxygen production by the chloroplasts they had isolated from

the plants.

The figure below shows the scientists' results.

Light intensity / mol photons m s-2 -1 (a) Explain why the scientists measured the rate of production of oxygen in this

investigation. ........................................................................................................................ ........................................................................................................................ ........................................................................................................................ ........................................................................................................................(2) In each trial, the scientists collected oxygen for 15 minutes.

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Visit for more fantastic resources.

(b) Calculate the difference in the oxygen produced by the chloroplasts from mutant plants grown in low and high light intensities at a light intensity of 500 mol photons m?2 s?1.

Show your working.

Difference .................................................................... mol O2 mg?1 hour?1 (2)

(c) The scientists suggested that mutant plants producing more chlorophyll b would grow faster than normal plants in all light intensities.

Explain how these data support this suggestion.

........................................................................................................................

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........................................................................................................................

........................................................................................................................ (4) (Total 8 marks)

Q4.

(a) In respiration in cells,

(i) where does glycolysis take place

.............................................................................................................(1)

(ii) where, exactly, is the electron transfer chain found?

.............................................................................................................(1)

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Visit for more fantastic resources. (b) Scientists kept kidney cells in a liquid culture. They investigated the effect of the gas nitric oxide on oxygen consumption by these cells. They recorded the oxygen concentration in the culture medium over a period of time. At intervals they added a small volume of nitric oxide to the culture medium. Nitric oxide affects the functioning of a protein in the electron transport chain. The graph shows their results.

Explain the effect of nitric oxide. ...................................................................................................................... ...................................................................................................................... ...................................................................................................................... ...................................................................................................................... ...................................................................................................................... ...................................................................................................................... (3)

(Total 5 marks)

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Visit for more fantastic resources. Q5.The figure below shows the apparatus used for measuring the rate of oxygen consumption

in aerobic respiration by seeds.

(a) For the first 10 minutes, the tap attached to tube A was left open and the syringe from tube B was removed. Suggest three reasons why the apparatus was left for 10 minutes. 1 ..................................................................................................................... ........................................................................................................................ 2 ..................................................................................................................... ........................................................................................................................ 3 ..................................................................................................................... ........................................................................................................................(3)

(b) Suggest and explain why the chosen temperature was 20 ?C for this experiment. ........................................................................................................................ ........................................................................................................................ ........................................................................................................................ ........................................................................................................................(2)

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