Rennin acts on

1. milk changing casein into calcium paracaseinate at 7.2 - 8.2 pH

2. protein in stomach

3. fat in intestine

4. milk changing casein into calcium paracaseinate at 1-3 pH

The hormone that stimulates the stomach to secrete gastric juice is 

1. gastrin

2. renin 

3. enterokinase

4. enterogasterone

The richest sources of vitamin-B₁₂ are 

1. goat's liver and Spirulina

2. chocolate and green gram

3. rice and hen's egg

4. carrot and chicken's breast

Which part of body secretes the hormone secretin ?

1. Oesophagus

2. Duodenum

3. Stomach

4. lleum

The contraction of gall bladder is due to

1. gastrin

2. secretin

3. cholecystokinin

4. enterogasterone