What is the significance of the Krebs cycle?

$A$ student has taken a twig from a plant. She/he observes a droplet of fluid exuding from the cut surface of the twig. What is this fluid?

Choose the incorrect sentence.

Select the correct option regarding the following statements:
$(1)$ During glycolysis/fermentation,$2 \, ATP$ molecules are produced from one molecule of glucose.
$(2)$ If the respiratory substrate is fat/carbohydrate,the $RQ$ of the respiring cells is less than one.

During respiration,substrate level phosphorylation occurs in . . . . . . .

Given below are two statements:
Statement-$I$: Acetyl $CoA$ formation takes place by oxidative decarboxylation of pyruvic acid.
Statement-$II$: $\beta$-oxidation of fatty acid produces acetyl $CoA$.
In the light of above statements,choose the most appropriate answer from the options given below.