Back to AI Flashcard MakerBiology /A-level Biology - 3.3.2 Photosynthesis Part 4
Name a use suitable statistical test to investigate correlation between light intensity and rate of photosynthesis
Spearmen's rank (correlation coefficient)
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Key Terms
Term
Definition
Name a use suitable statistical test to investigate correlation between light intensity and rate of photosynthesis
Spearmen's rank (correlation coefficient)
What does Spearmen's rank allow you to do?
Allows you to work out the degree to which 2 sets of data are correlated
What is Spearmen's rank given as (name the range of the values)?
Given as value between 1 and -1
Spearmen's Rank 1 = _ ______ _____
1 = strong positive correlation
Spearmen's Rank -1 = _ ______ _____
-1 = strong negative correlation
Spearmen's Rank 0 = ___ _________
0 = no correlation
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| Term | Definition |
|---|---|
Name a use suitable statistical test to investigate correlation between light intensity and rate of photosynthesis | Spearmen's rank (correlation coefficient) |
What does Spearmen's rank allow you to do? | Allows you to work out the degree to which 2 sets of data are correlated |
What is Spearmen's rank given as (name the range of the values)? | Given as value between 1 and -1 |
Spearmen's Rank 1 = _ ______ _____ | 1 = strong positive correlation |
Spearmen's Rank -1 = _ ______ _____ | -1 = strong negative correlation |
Spearmen's Rank 0 = ___ _________ | 0 = no correlation |
What do you do to the value you get form Spearmen's rank? | Compare your result to critical value to find if correlation is significant (Above critical value = accept hypothesis) |
Describe and explain how an increase in temperature and a reduction in light intensity will affect the growth of plants. (3) | Growth will decrease (at higher temperature) Rate of respiration will increase at higher temperature Photosynthesis decreases as there's less light |
ADP levels can be a ____ ______ | limiting factor |
When measuing the rate of photosynthesis of plants in terms of oxygen produced, suggest what units you could use | e.g. cm3 min-1 g-1 |
Explain why it is important for plants to produce ATP during respiration in addition to during photosynthesis. (5) | In dark, no ATP production in photosynthesis Some tissues unable to photosynthesis/produce ATP ATP can't be stored Plant uses more ATP than produced in photosynthesis ATP for active transport |
Explain why the increase in the dry mass of a plant over twelve months is less than the mass of hexose produced over the same period. (3) | Used in respiration CO2 produced Some parts of plant are eaten/decompose |
Herbicides affect the light-dependent reaction (namly the production of oxygen and the electron transport chain). Suggest how herbicides cause a reduction in the production of oxygen by plants (3) | Binds to chlorophyll molecules Stops release of electrons from chlorophyll Stops movement of electrons down electron transport chain ∴ break down of water reduces |
Herbicides affect the light-dependent reaction (namly the production of oxygen and the electron transport chain). Suggest how herbicides cause the death of plants (3) | Less ATP For light-independent reaction ∴ less sugars produced for respiration Rate of respiration is greater than rate of photosynthesis |
Explain why high levels of oxygen reduce the rate of photosynthesis (effect is greater at higher temperatures). (2) | More RuBP combines with O2 than CO2 Competitive inhibition (for rubisco) Less RuBP regenerated |
A buffer is used to maintain a constant pH. Explain why the pH of the suspension would increase during photosynthesis in the absence of a buffer. (1) | Decrease in carbon dioxide/hydrogencarbonate ions |
When measuing the rate of photosynthesis of plants, how can you keep the temperature constant? (1) | Place bottle/test tube in beaker of water |