The energy-releasing metabolic process in which substrate is oxidized without an external electron acceptor is called:

The anaerobic process that occurs after glycolysis during lactic acid formation is called:

Which type of respiration occurs in the muscle cells of animals during vigorous exercise?

Identify the products marked by $(i)$ and $(ii)$ in the following pathway:
$3$-phosphoglyceric acid $\rightarrow$ $(i)$ $\rightarrow$ Pyruvate $\rightarrow$ $(ii)$ (with $NADH + H^+$ being converted to $NAD^+$)

In anaerobic respiration,the respiration of seeds occurs in ......... .

In animal muscle cells,lactic acid fermentation occurs when there is poor supply of . . . . . . .