Assertion : Dark reaction occurs only at nigh | vedclass

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(D) Dark reaction is also known as light-independent phase. Unlike light reaction,it does not require light as an essential factor. Thus,it can take p

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If both the Assertion and Reason are incorrect.

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(D) Dark reaction is also known as light-independent phase. Unlike light reaction,it does not require light as an essential factor. Thus,it can take place both in the presence or absence of light.The term 'dark reaction' does not mean that it takes place only in the dark period or at night.$CO_2$ fixation occurs in both $C_3$ and $C_4$ cycles.In the $C_3$ cycle,$CO_2$ is fixed by the enzyme RuBisCO to a $5$-carbon compound $RuBP$,which is converted into $2$ molecules of $3$-carbon $PGA$.In the $C_4$ cycle,the first product of $CO_2$ fixation (which takes place in the mesophyll) is a $4$-carbon compound called oxaloacetic acid $(OAA)$.Since both the Assertion and the Reason are scientifically incorrect,the correct option is $D$.

Assertion : Dark reaction occurs only at night in the stroma of chloroplast.
Reason : $CO_2$ fixation occurs only during $C_3$ cycle.

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Assertion : Dark reaction occurs only at night in the stroma of chloroplast.Reason : $CO_2$ fixation occurs only during $C_3$ cycle.