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ddd [48]
3 years ago
15

The reactions of the Calvin cycle are not directly dependent on light, but they usually do not occur at night. Why? Group of ans

wer choices
a.The Calvin cycle requires products only produced when the photosystems are illuminated. It is often too cold at night for these reactions to take place.
b.At night, no water is available for the Calvin cycle.
c.Plants usually open their stomata at night.
d.Carbon dioxide concentrations decrease at night.
Chemistry
1 answer:
kati45 [8]3 years ago
6 0

Answer:

The correct answer is a The calvin cycle requires products only produced when the photsystems are illuminated .It is often too cold at night for the reaction to take place.

Explanation:

It is true that the reactions of calvin cycle are not directly depends on light but depends on the products such as ATP and NADPH produced during light reaction.

       ATP and NADPH is formed by the illumination of photosystems by sun light.So during night time there is no chance for the light dependent illumination of the photosystems.

    As a result the ATP and NADPH are not formed during night .That"s why reactions of calvin cycle does not occur at night.

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Answer:

(3) 5.36

Explanation:

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V NaOH = 40 mL x 1 L/1000 mL = 0.040 L

mol NaOH reacted with HAc = 0.040 L x 0.05 mol/L = 0.002 mol

mol HAC originally present = 0.050 L x 0.05 mol/L = 0.0025 mol

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Now that we have calculated the quantities of the weak acid and its conjugate base in the buffer, we just plug the values into the equation

pH = pKa + log ((Ac⁻)/(HAc))

(Notice we do not have to calculate the molarities of  Ac⁻ and HAc because the volumes cancel in the quotient)

pH = -log (1.75 x 10⁻⁵) + log (0.002/0.0005) = 5.36

THe answer is 5.36

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