8th Grade Biology Quizzes , Questions & Answers

Recent Biology Quizzes

Respiratory, Excretory, Circulatory & Nervous Systems

This assessment focuses on the respiratory, excretory, circulatory, and nervous systems. It evaluates your understanding of key functions, pathways, and components of these essential systems. By taking this quiz, you will...

Questions: 30 | Attempts: 10 | Last updated: Sep 3, 2026

Sample Question
What is the primary function of the respiratory system?

To filter waste products from the blood

To provide an area for gas exchange between the blood and the environment

To transport nutrients throughout the body

To regulate body temperature

Human Body Systems: Respiratory to Reproductive

This assessment focuses on key concepts related to human body systems, from respiration to reproduction. It evaluates your understanding of how various organs function, the pathways of urine, and the roles of different glands....

Questions: 8 | Attempts: 10 | Last updated: Sep 3, 2026

Sample Question
Which part of the brain is responsible for controlling involuntary actions such as digestion, respiration, and the beating of the heart?

Cerebrum

Cerebellum

Medulla Oblongata

Hypothalamus

Biology Science Topics Quiz

This assessment focuses on essential concepts in biology, including the functions of the digestive and excretory systems, genetic traits, and classification of living organisms. It evaluates understanding of key biological...

Questions: 30 | Attempts: 10 | Last updated: Sep 3, 2026

Sample Question
What is the main function of the digestive system?

To pump blood through the body

To break down food and move it through the body

To filter air into the lungs

To send signals to the brain

Photosynthesis Respiration Carbon Oxygen Water Cycles

This assessment focuses on the interconnections between photosynthesis, respiration, and the carbon, oxygen, and water cycles. It evaluates your understanding of how these processes work together to sustain life on Earth. By...

Questions: 30 | Attempts: 12 | Last updated: Aug 31, 2026

Sample Question
What is the carbon cycle?

The movement of oxygen through living organisms and the atmosphere

The continuous movement of carbon through the atmosphere, oceans, soil, and living organisms

The process by which plants absorb water from the soil

The cycle of water moving through liquid, vapor, and ice forms

Cellular Respiration Glycolysis Krebs Cycle ETC

This assessment focuses on cellular respiration, covering glycolysis, the Krebs cycle, and the electron transport chain. It evaluates your understanding of key processes like ATP production, metabolic pathways, and fermentation....

Questions: 30 | Attempts: 11 | Last updated: Aug 31, 2026

Sample Question
Where does glycolysis occur in the cell?

Mitochondria

Nucleus

Cytoplasm

Inner mitochondrial membrane

Cellular Respiration and Energy Cycles

This assessment focuses on cellular respiration and energy cycles, evaluating knowledge of ATP production, aerobic respiration, and fermentation. Understanding these concepts is essential for grasping how organisms convert energy...

Questions: 8 | Attempts: 11 | Last updated: Aug 26, 2026

Sample Question
How many ATP molecules does 1 NADH produce?

1.5 ATP

2.5 ATP

3.5 ATP

4.0 ATP

Photosynthesis and Cellular Respiration

This assessment focuses on the processes of photosynthesis and cellular respiration, evaluating your understanding of light absorption, pigment roles, and the connections between these vital biological processes. It is useful for...

Questions: 30 | Attempts: 10 | Last updated: Aug 23, 2026

Sample Question
What is a photon?

A type of chlorophyll pigment

A tiny packet or unit of light energy

A molecule that carries electrons

A protein found in the thylakoid membrane

Plant Photosynthesis

This assessment explores the fundamental processes of photosynthesis, including the roles of light-dependent reactions, chlorophyll, and the Calvin cycle. It evaluates your understanding of key concepts such as photorespiration...

Questions: 8 | Attempts: 13 | Last updated: Aug 23, 2026

Sample Question
What is photosynthesis?

The process by which organisms break down glucose to release energy

The process by which photosynthetic organisms use light energy to convert CO₂ and water into carbohydrates

The process by which heterotrophs obtain food from other organisms

The process by which plants absorb minerals from the soil

Origin of Biodiversity and Evolution

This assessment focuses on the origin of biodiversity and evolution, evaluating understanding of key concepts like Transformism, Evolutionism, and phylogenetic relationships. It is relevant for learners seeking to grasp how...

Questions: 8 | Attempts: 12 | Last updated: Aug 12, 2026

Sample Question
Which of the following best distinguishes Transformism from Evolutionism?

Transformism states species change through mutations and natural selection, while Evolutionism relies on inherited acquired traits

Transformism proposes species change through inheritance of acquired traits, while Evolutionism proposes gradual change through mutations and natural selection

Transformism denies any change in species, while Evolutionism accepts gradual change

Transformism and Evolutionism are essentially the same theory with different names

Digestive Processes and the Digestive Tract

This resource explores the digestive processes and the digestive tract, focusing on key concepts like ingestion, mechanical and chemical digestion, and absorption. Understanding these processes is essential for grasping how the...

Questions: 8 | Attempts: 37 | Last updated: Aug 12, 2026

Sample Question
What is ingestion?

The physical breakdown of food into smaller fragments

The process of taking food and liquids into the body through the mouth

The movement of food along the digestive tract

The elimination of feces from the digestive tract

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