When a man enters a seed godown,the feeling is that of

Sunken stomata are a characteristic feature of $.........$.

Given below are two statements.
$Statement-I$: Enzyme pyruvate dehydrogenase complex brings about oxidative decarboxylation of pyruvic acid.
$Statement-II$: Enzyme pyruvate dehydrogenase is not present in cytosol of prokaryotes.
In the light of the above statements, choose the correct answer from the options given below:

Assertion $A$: Carbohydrates are the primary source of energy in living organisms.
Reason $R$: Glucose is the common substrate used in respiration.
Which option is correct for Assertion $A$ and Reason $R$?

The following is a simplified scheme showing the fate of glucose during aerobic and anaerobic respiration. Identify the end products that are formed at stages indicated as $A, B, C$ and $D$. Identify the correct option from those given below.

The given schematic diagram shows three main biosynthetic pathways of aerobic respiration in three boxes. The arrows indicate reactants or products. Arrows $4, 8,$ and $12$ all represent -