Refer to the given cross-section of a $C_{4}$ leaf and select the incorrect option.

P are the chloroplasts in which thylakoids are stacked together to from grana.

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P is the chloroplasts which can perform the light reaction, evolve molecular

O_{2}

and produce assimilatory power.

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Q are the chloroplasts in which thylakoids occur as stroma lamellae.

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Q are the chloroplasts in which $

CO_2$CO2 is fixed by phosphoenol pyruvic acid to form oxaloacetic acid.

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Solution

The correct option is C Q are the chloroplasts in which $CO_2$ is fixed by phosphoenol pyruvic acid to form oxaloacetic acid.
The given cross section of leaf represents Kranz anatomy in a $C_{4}$ plant. P is the chloroplasts of mesophyll cells, which are granular (i.e, thylakoids are staked to form grana ) and are specialized to perform light reaction of photosynthesis, evolve $O_{2}$ and produce assimilation power $(A T P + N A D P H_{2}$ ).Q is the chloroplasts of bundle sheath cells which are stroma laminae. in these chloroplasts, final fixation of $C O_{2}$ takes place through Calvin cycle where $C O_{2}$ is fixed by RuBP in the presence of enzyme RuBisCO.
So, the correct answer is 'Q are the chloroplasts in which $C O_{2}$ is fixed by phosphoenol pyruvic acid to form oxaloacetic acid.'

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Similar questions

Which of the following is true about Chloroplasts?

(i) Chloroplasts are minute oval bodies bounded by a double membrane.

(ii) Their interior contains closely packed flattened sacs called thylakoids.

(iii) There are over 60 chloroplasts in a cell.

(iv) The pigment chlorophyll is contained in the empty spaces of thylakoids.

C O_{2}

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