What is the biosphere?

The part of Earth where life exists

Keeping the inside of the body stable

The role an organism plays in its environment

The science of classifying living things

What causes genetic variation in a population?

Mutations and sexual reproduction

A relationship where both organisms benefit

What does natural selection mean?

The best-adapted organisms survive and reproduce

What does population density refer to?

The number of individuals per unit area

What is the job of the nucleus in a cell?

Control the cell’s activities

What is genetic drift?

Random change in small populations

What are the three subatomic particles found in an atom?

Protons, neutrons, and electrons

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Biology Basics

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Test your knowledge on fundamental concepts in biology, from the scientific method to genetics and evolution.

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Questions 28

Answers

1
What is the biosphere?
The layer of gases surrounding Earth
The Earth's core
The solid surface of Earth
The part of Earth where life exists
2
What is the main job of fungi in an ecosystem?
Break down dead things
Fly
Reproduce quickly
Make food
3
What is the main function of the circulatory system?
To control thinking
To help the body move
To move blood through the body
To help with digestion
4
What is homeostasis?
Fighting off sickness
Keeping the inside of the body stable
Making new blood
The ability to grow quickly
5
What do viruses need in order to reproduce?
Food
Water
Sunlight
A host cell
6
What is the first step in the scientific method?
Making observations
Drawing conclusions
Conducting experiments
Reporting results
7
What do we call different forms of a gene?
Traits
Alleles
Chromosomes
Codons
8
What is a niche?
The physical area where an organism lives
A group of similar organisms
A type of ecosystem
The role an organism plays in its environment
9
What is the process called when a cell divides?
Mitosis
Respiration
Photosynthesis
Fertilization
10
Why do cells divide?
To stop working
To grow, repair, and reproduce
To rest
To shrink
11
What is the purpose of cellular respiration?
To break down oxygen
To release energy from food
To create sunlight
To make food
12
Which of the following is a biotic factor in an ecosystem?
Temperature
Water
Sunlight
Plants
13
What is taxonomy?
A kind of animal
The science of classifying living things
A method of DNA copying
How animals eat
14
Who developed the theory of evolution by natural selection?
Newton
Darwin
Mendel
Einstein
15
What causes genetic variation in a population?
Losing traits
Same DNA in all members
Identical twins
Mutations and sexual reproduction
16
What is mutualism?
A relationship where both organisms are harmed
A relationship where one organism benefits and the other is unaffected
A relationship where both organisms benefit
A relationship where one organism benefits and the other is harmed
17
What does natural selection mean?
Animals change because they want to
The strongest survive
All animals are equal
The best-adapted organisms survive and reproduce
18
Which human activity contributes most to climate change?
Recycling
Planting trees
Burning fossil fuels
Using solar panels
19
What causes genetic disorders?
Physical activity
Changes in DNA
Too much sugar
Air pollution
20
Which part of the cell makes energy?
Cell membrane
Ribosome
Lysosome
Mitochondria
21
What does population density refer to?
The number of individuals per unit area
The number of different species in an area
The age structure of a population
The total area a population occupies
22
What is the main job of plant leaves?
To grow roots
To protect the plant
To carry out photosynthesis
To absorb water
23
What is the main product of photosynthesis?
Protein
Oxygen
Sugar (glucose)
Energy
24
What is the job of the nucleus in a cell?
Pump water
Store waste
Help the cell move
Control the cell’s activities
25
What is genetic drift?
Random change in small populations
A large change in a big population
Movement of DNA
The wind moving animals
26
What are the three subatomic particles found in an atom?
Electrons, neutrons, and isotopes
Protons, neutrons, and electrons
Neutrons, compounds, and electrons
Protons, ions, and molecules
27
What gas is needed for cellular respiration?
Nitrogen
Oxygen
Carbon dioxide
Hydrogen
28
What did Gregor Mendel study to learn about inheritance?
Humans
Birds
Pea plants
Mice

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