Question

Fill in the blanks:
1. Light saturation occurs at (a)_______ percent of full sunlight.
2. There is a (b)________ relationship between incident light and $C{O}_2$ fixation rates at low light intensities.
3. $C_3$ plants show saturation at about (c)____ $\mu l{L}^{—1}$ while $C_4$ corresponds to saturation at about (d)_________$\mu l{L}^{-1}$.

• A. (a)— 2 -5% , (b)— sigmoid, (c)— 350, (d)— 460
• B. (a)— 50% , (b)— linear, (c)— 460, (d)— 350
• C. (a)— 10% , (b)— sigmoid, (c)— 360, (d)— 450
• D. (a)— 10% , (b)— linear, (c)— 450, (d)— 360

Answer 1

Answer: (D)

1. Light saturation occurs at $10\%$ per cent of full sun light.
2. There is a linear relationship between incident light and $C{O}_2$ fixation rates at low light intensities.
3. $C_3$ plants show saturation at about $450\mu l{L}^{-1}$ while $C_4$ corresponds to saturation at about $360\mu l{L}^{-1}$