Question

The given table depicts the observations of three different cell types under a microscope.

Cell type	Nucleus	Cell wall	Chloroplasts
A	No	Yes	No
B	Yes	Yes	No
C	Yes	Yes	Yes

The three cell types were grown in separate cultures with plenty of oxygen and nutrients available. Figure 1 shows their rates of growth. At time 1, oxygen was no longer available to the cells.

Given below are three equations.
(I) $C_6{H}_{12}{O}_6+{6O}_2\to {6CO}_2+{6H}_{2}O+ATP$
(II) $H_{2}O+light\to O_2+ATP+NADPH$
(III) 6 CO₂ + 6 H₂O + ATP + NADPH → C₆H₁₂O

Cell type C would show equation

• A. I only
• B. II only
• C. I and III only
• D. II and III only
• E. I, II and III

Answer 1

The correct option is E I, II and III

Since cell C has cell wall, chloroplast and nucleus, it is a plant cell. Equation I shows aerobic respiration of glucose to produce carbon dioxide and energy. Equation II shows splitting of water molecules during light reaction of photosynthesis. Equation III exhibits dark reaction of photosynthesis which produce organic compounds. The oxygen needed for aerobic respiraiton can be provided by light reaction of photosynthesis. Light reaction of photosynthesis can occur even in absence of oxygen. Hence both I and II can occur in absence of oxygen. Since dark reactions of photosynthesis also does not need oxygen, these reactions can also occur at time 1.

Thus, the correct answer is option E.