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General Biology 2 Unit Test Reviewer

Biology

This reviewer covers key concepts in General Biology 2, including animal and plant form and function, genetics and heredity, DNA and molecular biology, evolution and biodiversity, and classification. It includes definitions, functions, examples, and important terms for each topic.

Biology Science Education
24 Questions Medium Ages 16+ Mar 9, 2026

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About this Study Set

This study set covers Biology through 24 practice questions. This reviewer covers key concepts in General Biology 2, including animal and plant form and function, genetics and heredity, DNA and molecular biology, evolution and biodiversity, and classification. It includes definitions, functions, examples, and important terms for each topic. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

Questions & Answers

Browse all 24 questions from the General Biology 2 Unit Test Reviewer study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 What is an organ system?
  • A A group of cells working together.
  • B A group of organs working together to perform specific functions.
  • C A single organ with multiple functions.
  • D A system that regulates hormones.
2 Which organ is the main organ of the circulatory system?
  • A Lungs
  • B Kidneys
  • C Heart
  • D Brain
3 What is the primary function of the respiratory system?
  • A Breaking down food
  • B Transporting oxygen and nutrients
  • C Gas exchange
  • D Removing metabolic wastes
4 Where does gas exchange primarily occur in the respiratory system?
  • A Trachea
  • B Bronchi
  • C Lungs
  • D Alveoli
5 Which part of the digestive system is the main site of nutrient absorption?
  • A Stomach
  • B Small intestine
  • C Esophagus
  • D Large intestine
6 What is the main function of the excretory system?
  • A Digesting food
  • B Transporting blood
  • C Removing metabolic wastes
  • D Controlling body activities
7 What is the primary role of the kidneys in the excretory system?
  • A Producing hormones
  • B Filtering blood and producing urine
  • C Absorbing nutrients
  • D Transporting oxygen
8 The nervous system controls and coordinates body activities using what type of signals?
  • A Chemical signals
  • B Electrical signals and neurotransmitters
  • C Hormonal signals
  • D Mechanical signals
9 Which part of the brain is responsible for thinking and voluntary actions?
  • A Cerebellum
  • B Medulla oblongata
  • C Cerebrum
  • D Brainstem
10 What is homeostasis?
  • A The process of digestion
  • B The ability of the body to maintain stable internal conditions
  • C The transport of oxygen
  • D The regulation of hormones
11 What is the function of xylem in plants?
  • A Transporting food (sugars)
  • B Transporting water and minerals
  • C Storing energy
  • D Producing flowers
12 What does phloem transport in plants?
  • A Water and minerals
  • B Sunlight
  • C Food (sugars)
  • D Carbon dioxide
13 What is the main site of photosynthesis in plants?
  • A Roots
  • B Stem
  • C Leaves
  • D Flowers
14 What are the requirements for photosynthesis?
  • A Oxygen, water, soil
  • B Sunlight, carbon dioxide, water, chlorophyll
  • C Nutrients, minerals, air
  • D Heat, light, water
15 What is chlorophyll?
  • A A gas in the atmosphere
  • B The green pigment that captures light energy
  • C A type of plant tissue
  • D A plant hormone
16 What are stomata?
  • A Roots of a plant
  • B Small openings in leaves for gas exchange
  • C Transport tissues
  • D Plant hormones
17 What is transpiration in plants?
  • A Absorption of water
  • B Photosynthesis
  • C Loss of water vapor from leaves
  • D Transport of food
18 Who is considered the Father of Genetics?
  • A Charles Darwin
  • B Gregor Mendel
  • C Carolus Linnaeus
  • D Louis Pasteur
19 What is a gene?
  • A An observable characteristic
  • B A different form of a gene
  • C The genetic makeup of an organism
  • D A unit of heredity
20 An allele is:
  • A A unit of heredity
  • B The observable characteristic
  • C A different form of a gene
  • D The genetic makeup
21 What does genotype refer to?
  • A Observable characteristics
  • B The genetic makeup
  • C The process of reproduction
  • D The environment
22 Phenotype refers to:
  • A Genetic makeup
  • B Observable characteristics
  • C The DNA sequence
  • D Alleles
23 A dominant allele is:
  • A Expressed only when two copies are present.
  • B Expressed even if only one copy is present.
  • C Always hidden.
  • D Found only in males.
24 A recessive allele is:
  • A Expressed even if only one copy is present.
  • B Expressed only when two copies are present.
  • C Always dominant.
  • D Found only in females.
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