The photograph below shows a system of promoting grass growth on a football pitch by shining very bright light on the pitch when it is not in use, in order to accelerate photosynthesis. (i) Give two ways, other than the method shown in the photograph, by which photosynthesis could be accelerated in horticulture. (ii) Explain how one of the methods referred to in part (i) could accelerate photosynthesis. (b) Answer the following questions about photosynthesis. (i) In relation to electrons, describe the main events of each pathway in the light stage. (ii) Is the dark stage of photosynthesis anabolic or catabolic? Explain your answer. (iii) What happens to both ADP and NADP+ at the end of the dark stage? (iv) Name the two types of particle transferred from NADPH to CO2 in the dark stage.

Leaving Cert Biology Photosynthesis: The photograph below shows a sys

The photograph below shows a system of promoting grass growth on a football pitch by shining very bright light on the pitch when it is not in use, in order to accelerate photosynthesis - Leaving Cert Biology - Question 13 - 2017

Question 13

The photograph below shows a system of promoting grass growth on a football pitch by shining very bright light on the pitch when it is not in use, in order to accele... show full transcript

Worked Solution & Example Answer:The photograph below shows a system of promoting grass growth on a football pitch by shining very bright light on the pitch when it is not in use, in order to accelerate photosynthesis - Leaving Cert Biology - Question 13 - 2017

Step 1

Give two ways, other than the method shown in the photograph, by which photosynthesis could be accelerated in horticulture.

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Answer

Increase CO2 concentration in the environment.
Increase temperature to enhance enzymatic reactions.

Step 2

Explain how one of the methods referred to in part (i) could accelerate photosynthesis.

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Answer

Increasing CO2 concentration can enhance photosynthesis because more carbon dioxide is available for the plants to fix during the process of photosynthesis, particularly in the Calvin cycle where CO2 is converted into glucose.

Step 3

In relation to electrons, describe the main events of each pathway in the light stage.

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Answer

Pathway 1:

Energised electrons leave the chlorophyll molecule.
The electrons lose energy as they move through the electron transport chain.
The same electrons return to chlorophyll.

Pathway 2:

The electrons lose energy and combine with NADP+, producing NADPH.
Different electrons are returned to chlorophyll to replenish it.

Step 4

Is the dark stage of photosynthesis anabolic or catabolic? Explain your answer.

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Answer

The dark stage of photosynthesis is anabolic because it involves the synthesis of larger molecules, like glucose, from smaller molecules, such as carbon dioxide and water.

Step 5

What happens to both ADP and NADP+ at the end of the dark stage?

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Answer

Both ADP and NADP+ return to the light stage of photosynthesis to be recharged and reused.

Step 6

Name the two types of particles transferred from NADPH to CO2 in the dark stage.

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Answer

Electrons (or 'e')
Protons or hydrogen ions ('H+')

The photograph below shows a system of promoting grass growth on a football pitch by shining very bright light on the pitch when it is not in use, in order to accelerate photosynthesis - Leaving Cert Biology - Question 13 - 2017

Worked Solution & Example Answer:The photograph below shows a system of promoting grass growth on a football pitch by shining very bright light on the pitch when it is not in use, in order to accelerate photosynthesis - Leaving Cert Biology - Question 13 - 2017

Give two ways, other than the method shown in the photograph, by which photosynthesis could be accelerated in horticulture.

Explain how one of the methods referred to in part (i) could accelerate photosynthesis.

In relation to electrons, describe the main events of each pathway in the light stage.

Is the dark stage of photosynthesis anabolic or catabolic? Explain your answer.

What happens to both ADP and NADP+ at the end of the dark stage?

Name the two types of particles transferred from NADPH to CO2 in the dark stage.

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