Gr 9 NATURAL SCIENCES: CH 1.5 Digestion and the alimentary canal

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Questions and Answers

What is the primary function of digestion?

  • To transform food into small molecules for the body's cells (correct)
  • To eliminate waste from the body
  • To store food in the body
  • To absorb nutrients from the food

What type of digestion occurs in the mouth?

  • Only chemical digestion
  • Both mechanical and chemical digestion (correct)
  • Only mechanical digestion
  • Neither mechanical nor chemical digestion

What is the function of the oesophagus?

  • To store food in the body
  • To move food from the mouth to the stomach (correct)
  • To absorb nutrients from the food
  • To break down food into smaller pieces

What is the main function of the stomach in digestion?

<p>To continue mechanical digestion and start chemical digestion (A)</p> Signup and view all the answers

What is the location of the majority of digestion and nutrient absorption?

<p>Small intestine (C)</p> Signup and view all the answers

What is the function of enzymes in digestion?

<p>To accelerate chemical reactions in the body (A)</p> Signup and view all the answers

What is the term for the wave-like muscle contractions that move food through the oesophagus?

<p>Peristalsis (D)</p> Signup and view all the answers

What is the primary function of the large intestine?

<p>To absorb water and salts from the remaining indigestible food matter (B)</p> Signup and view all the answers

What is the purpose of peristalsis in the digestive system?

<p>To move food through the alimentary canal (C)</p> Signup and view all the answers

Which enzyme breaks down carbohydrates?

<p>Amylase (D)</p> Signup and view all the answers

What is the process of expelling undigested and unabsorbed food from the body?

<p>Egestion (B)</p> Signup and view all the answers

Where do nutrients from digested food get absorbed primarily?

<p>Small intestine (B)</p> Signup and view all the answers

What is the role of the rectum in the digestive system?

<p>To store feces until they are expelled through the anus (B)</p> Signup and view all the answers

What is the function of villi and microvilli in the small intestine?

<p>To increase the surface area for absorption (B)</p> Signup and view all the answers

Which enzyme breaks down fats?

<p>Lipase (A)</p> Signup and view all the answers

What is the result of the digestion process?

<p>The breakdown of food into small molecules (B)</p> Signup and view all the answers

Which part of the alimentary canal is responsible for both mechanical and chemical digestion?

<p>Mouth (A)</p> Signup and view all the answers

What is the function of gastric juices in the stomach?

<p>To break down proteins (B)</p> Signup and view all the answers

What is the main difference between mechanical digestion and chemical digestion?

<p>Mechanical digestion breaks down food physically, while chemical digestion breaks down food chemically (C)</p> Signup and view all the answers

Which part of the alimentary canal connects the mouth to the stomach?

<p>Oesophagus (A)</p> Signup and view all the answers

What is the result of peristalsis in the oesophagus?

<p>The movement of food down the oesophagus (B)</p> Signup and view all the answers

What is the overall function of the alimentary canal?

<p>To absorb nutrients and eliminate waste (D)</p> Signup and view all the answers

What is the role of enzymes from the pancreas in the digestive system?

<p>To aid in breaking down proteins, fats, and carbohydrates (C)</p> Signup and view all the answers

What is the main function of the small intestine in the digestive system?

<p>To absorb nutrients from digested food (C)</p> Signup and view all the answers

What is the purpose of the microvilli in the small intestine?

<p>To increase the surface area for absorption (D)</p> Signup and view all the answers

What is the term for the process of moving food through the alimentary canal?

<p>Peristalsis (A)</p> Signup and view all the answers

What is the role of protease in the digestive system?

<p>To break down proteins (B)</p> Signup and view all the answers

What is the function of the anus in the digestive system?

<p>To expel undigested and unabsorbed food from the body (D)</p> Signup and view all the answers

What is the term for the absorption of nutrients from digested food?

<p>Absorption (D)</p> Signup and view all the answers

What is the role of the liver in the digestive system?

<p>To produce bile that aids in digestion (A)</p> Signup and view all the answers

What is the primary function of the stomach in the digestive system?

<p>To continue the process of mechanical digestion through muscular contractions (C)</p> Signup and view all the answers

Where does chemical digestion of proteins begin?

<p>In the stomach (B)</p> Signup and view all the answers

What is the role of amylase in digestion?

<p>To break down starches into simple sugars (A)</p> Signup and view all the answers

What is the primary function of the small intestine in the digestive system?

<p>To absorb nutrients from digested food (B)</p> Signup and view all the answers

What is the term for the tube that runs from the mouth to the anus and is responsible for digestion and absorption of food?

<p>Alimentary canal (D)</p> Signup and view all the answers

What is the role of hydrochloric acid in the stomach?

<p>To change the pH of the stomach to facilitate enzyme activity (D)</p> Signup and view all the answers

What type of digestion involves the physical breakdown of food through chewing, churning, and mashing?

<p>Mechanical digestion (B)</p> Signup and view all the answers

What is the primary function of the enzymes secreted by the pancreas in the digestive system?

<p>To break down proteins, fats, and carbohydrates into smaller molecules (C)</p> Signup and view all the answers

What is the main function of villi and microvilli in the small intestine?

<p>To increase the surface area for absorption (B)</p> Signup and view all the answers

Which of the following statements about the large intestine is TRUE?

<p>It absorbs water and salts from the remaining indigestible food matter (B)</p> Signup and view all the answers

What is the role of lipase in the digestive system?

<p>To break down fats into fatty acids and glycerol (B)</p> Signup and view all the answers

What is the result of the absorption of nutrients from digested food?

<p>The transportation of nutrients to cells through the bloodstream (B)</p> Signup and view all the answers

What is the role of peristalsis in the digestive system?

<p>To move food through the alimentary canal (B)</p> Signup and view all the answers

What is the primary function of the rectum in the digestive system?

<p>To store feces until defecation (A)</p> Signup and view all the answers

What is the term for the process of breaking down proteins into amino acids?

<p>Proteolysis (B)</p> Signup and view all the answers

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