Look at the given figure which shows the effect of light on the rate of photosynthesis. Based on the graph answer the following questions: (a) At which point/s (A, B or C) in the curve is light a limiting factor? (b) What could be the limiting factors in region A? (c) What do C and D represent on the curve?

Look at the given figure which shows the effect of light on the rate of photosynthesis. Based on the graph answer the following questions: (a) At which point/s (A, B or C) in the curve is light a limiting factor? (b) What could be the limiting factors in region A? (c) What do C and D represent on the curve?

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter20: The Protists

Section: Chapter Questions

Problem 4CT: Melvin Calvin and Andrew Benson determined the steps in the light-independent reactions of...

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Melvin Calvin and Andrew Benson determined the steps in the light-independent reactions of photosynthesis by exposing the green alga Chlorella to CO2 labeled with the radioisotope carbon 14. By looking at which compounds the C14 ended up in, they were able to identify all intermediates in this cyclic pathway. Why did they predict correctly that the same set of intermediates would be formed in the light reaction in land plants?
If plants described in problem 4 are illuminated by a combination of light of 680 nm and 700 nm, the oxygen production exceeds that of either wavelength alone. Explain.
You continuously monitor the photosynthetic oxygen production from the leaf of a plant illuminated by white light. How and why would oxygen production change if you placed filters in front of the light source that transmit (a) only red, (b) only infrared, and (c) only green light onto the leaf?
Which of the mechanisms for dissipating light energy shown in Fig. would best protect the photosystems from excess light energy?
To assess photosynthesis, we relied heavily on a spectrophotometer to measure the color intensity of DCPIP in our solution. We set the spectrophotometer at wavelengths in the visible spectrum. What is the approximate wavelength range (in nm) for the visible spectrum? For example, the ultraviolet spectrum wavelength range is approximately 10-400 nm
a.) Are there chloroplast in guard cells? b.) How do the guard cells function? c.) What photosynthetic reaction occur in chloroplast?
Given an equal amount of photons, what is the order of increasing effectiveness of blue, red, green, and white light (combination of the three main wavelengths) on photosynthetic activity?
Using the graph comparing photosynthetic rate and absorption of different wavelengths of light, what can be concluded? a) The photosynthesis rate at 550 nm is the highest b) Chlorophyll a absorbs wavelengths at both ends of the spectrum c) Chlorophyll b is associated with the greatest rate of photosynthesis. d) Carotenoids absorb the narrowest range of wavelengths of light
Does the diagram represent cyclic or non-cyclic photophosphorylation: ____________________ ? When the reaction center of photosystem II ejects a high energy electron, the electron is replaced by an electron from _______________. When the reaction center of photosystem I ejects an electron, the electron goes to _____________________. What two high energy molecules are produced during the light dependent reactions of photosynthesis: ______________ and _____________?
Which of the following changes would decrease ATP production in the light-dependent reactions of photosynthesis? a. decreasing the pH of the thylakoid lumen b. decreasing the pH of the chloroplast stroma c. increasing the concentration of NADP+ in the chloroplast stroma d. making the thylakoid membrane freely permeable to protons by adding a proton channel e. two of the above would decrease ATP production
Observing the over-all equation for photosynthesis, what are two variables other than light intensity, which would have an influence on how quickly the leaf disks float? Thanks in advance
Students are preforming an experiment to study the role of light in photosynthesis. They place an Elodea plant into a large test tube with water and assemble a volumeter using a cork and calibrated glass tubing. Then, the apparatus is placed near a lamp. Soon after, the water level in the tubing begins to move upward. Why does the edge of the water move upward?