Which of these statements is best supported by these data? Experimental Plot Wavelength Wave intensity Crop Yields (4m x 15m) (nm) (Joules/m²) (g/m²) A 357.6 110 B 357.6 8 110 357.6 20 30 D 357.6 25 20 a. Wheat plants exposed to high-intensity ultraviolet light produce fewer seeds. b. Chloroplasts of wheat are able to filter out low-intensity ultraviolet light. c. High-intensity ultraviolet light may be used to control weed growth. d. No exposure to ultraviolet light increases pollination in wheat plants. Write three observations Write one inference answer

Which of these statements is best supported by these data? Experimental Plot Wavelength Wave intensity Crop Yields (4m x 15m) (nm) (Joules/m²) (g/m²) A 357.6 110 B 357.6 8 110 357.6 20 30 D 357.6 25 20 a. Wheat plants exposed to high-intensity ultraviolet light produce fewer seeds. b. Chloroplasts of wheat are able to filter out low-intensity ultraviolet light. c. High-intensity ultraviolet light may be used to control weed growth. d. No exposure to ultraviolet light increases pollination in wheat plants. Write three observations Write one inference answer

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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Solar-induced fluorescence can be used to infer net photosynthesis. This is because this solar-induced fluorescence is able to measure the light that is used by the chlorophyll-a pigment (650-850nm). There is a linear relationship between this solar-induced fluorescence and the gross primary production of a plant. How does measuring chlorophyll-a pigment with solar-induced fluorescence help us infer net photosynthesis?
Light that the chlorophyll-a pigment uses may be measured by the solar-induced fluorescence (650-850nm). This fluorescence caused by the sun and a plant's gross primary output are correlated linearly. Why does this reasoning shows that solar induced fluorescence can be used to infer net photosynthesis?
. Based on the data in the scatter plot, estimate the percentagechange in dry mass of corn and velvetleaf plants if atmosphericCO2 concentration increased from 390 ppm (current levels)to 800 ppm. (a) What is the estimated dry mass of corn andvelvetleaf plants at 390 ppm? 800 ppm? (b) To calculate thepercentage change in mass for each plant, subtract the massat 390 ppm from the mass at 800 ppm (change in mass), divideby the mass at 390 ppm (initial mass), and multiply by 100. Whatis the estimated percentage change in dry mass for corn? Forvelvetleaf? (c) Do these results support the conclusion fromother experiments that C3 plants grow better than C4 plantsunder increased CO2 concentration? Why or why not?
Plants containing only chlorophyll b are exposed to radiation with the following wavelengths: 10nm (x-rays), 450nm (blue light), 670nm (red light), and 800nm (infrared light). Which plants harness the most energy for photosynthesis? a. X-ray irradiated plants b. Blue light irradiated plants c. Red light irradiated plants d. Infrared irradiated plants
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?
What is the significance that the combined absorption spectra of chlorophylls a and b roughly match the action spectrum of photosynthesis? Would photosynthesis be more efficient if their individual absorption spectra coincided exactly?
This experiment is done in a thermal flask, will you be able to perform the same results (flask A with germinated seeds temperature increases and flask B with boiled seeds temperature remain unchanged), assuming you will be using a regular glass flask? Why?
Solar-induced fluorescence has a linear relationship with a plant's gross primary production. Explain why the relationship is linear?
Why do you think the wavelengths 700-800 were least absorbed bu pigments in plants?
Explain why the chlorophylls in light-harvesting complexes must absorb light of shorter wavelength than the light that would directly excite the special pair of PSI or PSII.
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.
In an experiment conduct to know the effect of light intensity on the rate of photosynthesis in spinach leaves, with the use of 5 ml of a 0.2% sodium bicarbonate (NaHCO3) and a solution of dilute drop of liquid soap. in relation this experiment, state an hypothesis that predicts the relationship between light intensity and the rate of photosynthesis. Identify independent and dependent variables. What is your control group, and why is this an appropriate control?