Science Quiz for Grade 8

Which organ is not directly involved in the digestion of food?

• Liver

• Kidney

• Stomach

• Small intestine

Which part of the digestive system is primarily responsible for absorbing nutrients?

• Stomach

• Small intestine

• Large intestine

• Esophagus

Which body system is mainly responsible for transporting the nutrients to the cells?

• Nervous system

• Circulatory system

• Respiratory system

• Endocrine system

Which of the following best describes the role of the liver and gallbladder?

• They produce and store bile that breaks down fats

• They absorb nutrients from food

• They filter waste products from food

• They pump oxygen to the digestive system

Which process is demonstrating when you use your teeth to break the cracker into smaller pieces?

• Absorption

• Emulsification

• Enzymatic breakdown

• Mechanical digestion

What occurs during the process of absorption in the digestive system?

• Food is broken down into smaller molecules

• Nutrients move into the bloodstream from the intestines

• Waste is eliminated through the anus

• Enzymes break down food in the stomach

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

• Absorbing water and minerals from waste

• Absorbing most of the nutrients from food

• Producing bile for fat digestion

• Releasing digestive enzymes to break down food

How do the digestive and excretory systems work together in the body?

• By producing hormones that regulate digestion

• By sharing nutrients with each other

• By transporting and eliminating waste

• By regulating the body's temperature during digestion

Which of the following is NOT a part of the plant transport system?

• Xylem

• Phloem

• Stomata

• Chloroplasts

Which statement best describes the structure and function of xylem tissue in plants?

• Xylem transports sugars from leaves to roots.

• Xylem vessels are made of dead cells that help conduct water.

• Xylem is responsible for opening and closing stomata.

• Xylem transports amino acids in plants.