Year 8 Cells & Body Systems Revision

What is a key difference between unicellular and multicellular organisms?

• Unicellular organisms have multiple cells
• Unicellular organisms have one cell
• Unicellular organisms can only be found in water
• Unicellular organisms are larger than multicellular organisms

Which of the following is an advantage of unicellular organisms?

• They have higher energy production
• They have increased specialization
• They can reproduce more quickly
• They have complex organ systems

In multicellular organisms, which level of organization involves the coordination of similar tissues to perform specific functions?

• Organs
• Organisms
• Tissues
• Cells

What is the primary role of the digestive system?

• Respiration
• Circulation
• Absorption
• Excretion

How is digestion defined?

• The breakdown of large, soluble food molecules
• The breakdown of small, water-soluble molecules
• The formation of large, insoluble food molecules
• The movement of food through the alimentary canal

Which of the following is NOT a region of the alimentary canal?

• Liver
• Stomach
• Small intestine
• Large intestine

What are the main functions of the pancreas in digestion?

• Producing bile
• Producing insulin
• Producing digestive enzymes
• Producing mucus

What is the primary cause of dental decay?

• Consuming too many fruits
• Bacterial growth in the mouth
• Lack of calcium intake
• Overbrushing teeth

How is absorption defined in the context of digestion?

• Movement of food through the intestines
• Movement of digested food into the blood
• Breakdown of food into smaller molecules
• Storage of nutrients in the liver

What is the significance of villi in the small intestine?

• They produce digestive enzymes
• They increase the internal surface area
• They store nutrients temporarily
• They regulate the passage of food