What does heterotrophic nutrition include?

Select the correct option:
$(1)$ Yellowing of skin and eyes in jaundice is due to the accumulation of bile pigments $Bilirubin$ / $Biliverdin$.
$(2)$ The process of converting simple biological molecules into complex macromolecules is called $Digestion$ / $Assimilation$.

Choose the correct option:
$(1)$ The calorific value of fat is higher than that of glucose.
$(2)$ Premolars are absent in the dental formula of a human child.

Given below are two statements:
$Statement I$: The cardiac sphincter prevents regurgitation of food from the stomach to the duodenum.
$Statement II$: The pyloric sphincter regulates the flow of food from the oesophagus to the stomach.
In the light of the above two statements, choose the most appropriate answer from the options given below.

Choose the correct answer among the following:
$(a)$ Gastric juice contains
$(i)$ pepsin,lipase and rennin
$(ii)$ trypsin,lipase and rennin
$(iii)$ trypsin,pepsin and lipase
$(iv)$ trypsin,pepsin and renin
$(b)$ Succus entericus is the name given to
$(i)$ a junction between ileum and large intestine
$(ii)$ intestinal juice
$(iii)$ swelling in the gut
$(iv)$ appendix

What would happen if our intestine harboured a microbial flora exactly similar to that found in the rumen of cattle?