21.

Identify the vertebrate group of animals characterized by crop and gizzard in its digestive system

• Amphibia

• Reptilia

• Osteichthyes

• Aves

Identify the correct set, which shows the name of the enzyme from where it is secreted and the substrate upon which it acts.

• Ptyalin – Intestine – Maltose

• Ptyalin – Pancreas – Lipid

• Pepsin – Stomach wall – Caesin

• Chymotrypsin – Salivary gland – Lactose

Oxyntic cells secrete

• HCl

• Trypsin

• NaOH

• Pepsinogen

Vitamin-B₁₂ is absorbed primarily in the

• Stomach

• Duodenum

• Jejunum

• ileum

The layer of cells that secrete enamel of the tooth is

• Dentoblast

• Ameloblast

• Osteoblast

• Odontoblast

Kupffer cells are present in

• liver

• small intestine

• pancreas

• thyroid gland

Secretion of pancreatic juice is stimulated by

• gastrin

• secretin

• enterogasteron

• enterokinase

Digestion' word means

• burning of food

• oxidation of food

• hydrolysis of food

• oxidation of food

Maximum absorption of water occurs in

• colon 

• rectum

• large intestine

• small intestine

Which of the following hormone stimulates the gastric secretion

• Enterogastrone

•  Gastrin

• CCK-PZ

• Villikinin