All Free Biology MCQs with Answers

• A. Amylase
• B. Lipase
• C. Enterokinase
• D. Pepsin

Explanation: [A] Amylase is release in mouth in active form[B] Lipase is released in pancreatic juice to break down fats[C] Enterokinase is a protease…

• A. Secretin
• B. Pepsinogen
• C. Gastrin
• D. Both Gastrin and Secretin

Explanation: [A] Secretin is a hormone released by duodenum which stimulates secretion by the liver and pancreas[B] Pepsinogen is released in stomach…

• A. Hard Palate
• B. Soft Palate
• C. Epiglottis
• D. Larynx

Explanation: Option [A] hard palate plays a significant role as it separates the oral cavity from the nasal cavity and aiding swallowing and…

• A. Metabolic disorder
• B. Chemical causes
• C. Nutritional deficiency
• D. Mental Illness

Explanation: Option A is incorrect since a metabolic disorder occurs when the metabolism process fails whereas beri beri is caused by deficiency of…

• A. Bolus
• B. Bolus or chyme
• C. Mucus
• D. Chyme

Explanation: After food enters the stomach, the muscular walls of the stomach contract and mix the food with gastric juices, breaking it down into a…

• A. Goblet cells
• B. Absorptive cells
• C. Enterokinase
• D. Peptidase

Explanation: Enterokinase, also known as enteropeptidase, converts inactive trypsinogen into active trypsin in the duodenum, where it helps in protein…

• A. Pepsinogen, Pepsin
• B. Pepsinogen, Trypsin
• C. Trypsinogen, Trypsin
• D. Chymotrypsinogen, Chymotrypsin

Explanation: The correct answer is Trypsinogen is activated to Trypsin by Enterokinase, which is an enzyme secreted by the lining of the duodenum.

• A. Pepsin
• B. Pepsinogen
• C. Gastrin
• D. HCl

Explanation: HCL (Hydrochloric acid): This option is the correct answer. Oxyntic cells, also known as parietal cells, in the stomach are responsible…

• A. Parietal Cells
• B. Goblet Cells
• C. Chief Cells
• D. Zymogen Cells

Explanation: Parietal cells (also known as oxyntic cells) are epithelial cells in the stomach that secrete hydrochloric acid (HCl).

• A. Submucosa
• B. Mucosa
• C. Muscularis
• D. Serosa

Explanation: Mucosa is the innermost layer of the digestive tract and is responsible for secretion and absorption.

• A. Glottis
• B. Tongue
• C. Cheeks
• D. Epiglottis

Explanation: The epiglottis is a leaf-shaped flap of cartilage located behind the tongue, at the top of the larynx.

• A. Mucosa
• B. Visceral fat cells
• C. Mucus cells
• D. Oxyntic cells

Explanation: Since the other labeled cells are Zymogen cells (also known as acinar cells, which secrete digestive enzymes), the unlabeled cell type…

• A. 4
• B. 3
• C. 6
• D. 2

Explanation: Human salivary glands are divided into two main types: major salivary glands (parotid, submandibular, and sublingual) and numerous minor…

• A. Hepatic artery
• B. Hepatic vein
• C. Hepatic portal vein
• D. Hepatic portal artery

Explanation: The hepatic portal vein is the vessel that carries nutrient-rich blood containing digested food from the small intestine to the liver.

• A. Deoxygenated Blood
• B. Oxygenated Blood
• C. Filtered Blood
• D. Non-Filtered Blood

Explanation: [A] Right atrium receives the deoxygenated blood from vena cava after which does into right ventricle and moves through pulmonary artery…

• A. Smooth Muscles
• B. Papillary Muscles
• C. Intercostal Muscles
• D. Skeletal Muscles

Explanation: This option is the correct answer. The flaps of the tricuspid valves are attached to muscular extensions of the right ventricle known as…

• A. Cardiac end of stomach valve
• B. Pyloric sphincter of stomach
• C. Tricuspid valve of heart
• D. Eyelid

Explanation: The chordae tendineae are fibrous cords that attach the flaps of the tricuspid valve to the papillary muscles in the right ventricle of…

• A. Interstitial cells
• B. Spermatogonia
• C. Secondary spermatocytes
• D. Spermatids

Explanation: Option [A] interstitial cells are present between the seminiferous tubules of testis and secrete testosterone hormone.Option [B] Each…

• A. Ovaries
• B. Uterus
• C. Cervix
• D. Oviduct

Explanation: The zygote is formed in the oviduct and moves towards the uterus where it could be embedded.

• A. Primary spermatocytes
• B. Spermatids
• C. Secondary spermatocytes
• D. Spermatogonia

Explanation: Spermatids are the end result of the process of meiosis. They, then, undergo specialization which includes growing flagella, and acrosomes…