Science Practice Quiz 50

Q1.What is the basic structure of the alimentary canal in human beings?

A. A series of specialized organs B. A long tube extending from the mouth to the anus C. A complex network of digestive glands D. A single-celled structure for nutrient absorption

Q2.Unlike Amoeba, Paramoecium is characterized by what specific feature regarding its shape?

A. It constantly changes its shape B. It has a definite shape C. It forms temporary extensions for movement D. Its shape is determined by food intake

Q3.Which enzyme present in saliva is responsible for breaking down complex starch molecules into simple sugars?

A. pepsin B. lipase C. trypsin D. salivary amylase

Q4.The fluid known as saliva, which helps in wetting food and initiating digestion, is secreted by which glands?

A. gastric glands B. pancreatic glands C. salivary glands D. adrenal glands

Q5.What are the rhythmic contractions of muscles in the lining of the digestive canal that push food forward called?

A. muscular spasms B. peristaltic movements C. gastric contractions D. enzymatic actions

Q6.From the mouth, food is taken to the stomach through which part of the digestive system?

A. trachea B. pharynx C. oesophagus D. duodenum

Q7.Which of the following is NOT a secretion of the gastric glands present in the wall of the stomach?

A. hydrochloric acid B. pepsin C. mucus D. salivary amylase

Q8.What is the primary function of hydrochloric acid in the stomach, as described in the digestive process?

A. to break down fats B. to emulsify proteins C. to create an acidic medium for pepsin D. to protect the stomach lining

Q9.What substance protects the inner lining of the stomach from the action of hydrochloric acid under normal conditions?

A. bile B. pepsin C. mucus D. saliva

Q10.Which enzyme, secreted by the gastric glands, is responsible for digesting proteins in the stomach?

A. salivary amylase B. lipase C. pepsin D. trypsin

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Science Practice Quiz 50