CBSE Class 11-science Answered

Hi Nisha,

1. Net yield of aerobic respiration per glucose molecule: 36 ATP

   Total Yield of ATP from Respiration = Net ATP Gain (Glycolysis + Oxidative Phosphorylation of Pyruvic acid + Krebs cycle)

                                                         = 8 + 30

                                                         = 38 ATP

 = 38 − 2 ATP

                                                         = 36 ATP

In eukaryotic cells, glycolysis occurs in the cytoplasm and the Krebs cycle occurs in the mitochondrion.

Hence, two molecules of NADH produced during glycolysis must be transported to the inner membrane of the mitochondrion for ATP synthesis. 

The inner mitochondrial membrane is impermeable to NADH molecules; hence, its transport requires one ATP molecule per molecule of NADH.

Therefore, the net ATP production is decreased by two.

Hence, the total yield of ATP is 36.

2. Meristematic region present between xylem and phloem of open vascular bundle: Cambium