Science Flashcards
1
Q
What is the main source of energy for Earth?
A
The Sun.
2
Q
What do plants need to make food?
A
Sunlight, water, and carbon dioxide.
3
Q
What is the process by which plants make their food called?
A
Photosynthesis.
4
Q
What are the three states of matter?
A
Solid, liquid, and gas.
5
Q
What do we call animals that eat only plants?
A
Herbivores.
6
Q
What do we call animals that eat both plants and animals?
A
Omnivores.
7
Q
What is the function of roots in a plant?
A
To absorb water and nutrients from the soil.
8
Q
What is the outermost layer of the Earth called?
A
The crust.
9
Q
Which gas do humans inhale to survive?
A
Oxygen.
10
Q
What do we call young ones of frogs?
A
Tadpoles.
11
Q
What is the function of a flower in a plant?
A
It helps in reproduction by producing seeds.
12
Q
What are the five human senses?
A
Sight, hearing, touch, taste, and smell.
13
Q
What is the largest organ in the human body?
A
The skin.
14
Q
What do bees collect from flowers to make honey?
A
Nectar.
15
Q
What is the name of the gas that plants release during photosynthesis?
A
Oxygen.
16
Q
What are baby birds called when they hatch?
A
Chicks.
17
Q
Which part of the body helps humans to balance?
A
The inner ear.
18
Q
What do we call water in its frozen state?
A
Ice.
19
Q
What is the function of a thermometer?
A
To measure temperature.
20
Q
What is the main gas found in the air we breathe?
A
Nitrogen.
21
Q
What is the main function of leaves in a plant?
A
To make food through photosynthesis.
22
Q
What do we call the layer of air surrounding Earth?
A
The atmosphere.
23
Q
Which organ pumps blood throughout the body?
A
The heart.
24
Q
What is the name of the closest planet to the Sun?
A
Mercury.
25
What is the primary function of the skeleton?
To provide support and protect organs.
26
What are the small holes on the underside of leaves called?
Stomata.
27
What is the main gas used by plants for photosynthesis?
Carbon dioxide.
28
What do we call animals that eat only meat?
Carnivores.
29
How many legs do insects have?
Six.
30
What is the name of the process by which water changes into vapor?
Evaporation.
31
What is the main function of the sun in our solar system?
It provides light and heat energy.
32
What do we call a baby cow?
A calf.
33
How many continents are there on Earth?
Seven.
34
What gas do humans exhale when they breathe out?
Carbon dioxide.
35
What is the hardest natural substance on Earth?
Diamond.
36
What part of the body helps us hear sounds?
The ears.
37
What force pulls objects toward the center of the Earth?
Gravity.
38
What is the name of the process where plants lose water through their leaves?
Transpiration.
39
What is the function of the brain?
It controls thoughts, actions, and body functions.
40
Which planet is known as the Red Planet?
Mars.
41
What is the name of the galaxy that contains our solar system?
The Milky Way.
42
What is the main gas that makes up the air we breathe?
Nitrogen.
43
What do we call an animal that eats both plants and meat?
An omnivore.
44
How many legs does a spider have?
Eight.
45
What is the smallest unit of life in the human body?
A cell.
46
What do we call the young of a butterfly?
A caterpillar.
47
What organ helps fish breathe underwater?
Gills.
48
What is the name of the imaginary line that divides the Earth into Northern and Southern Hemispheres?
The Equator.
49
What do bees make from nectar?
Honey.
50
What do plants release into the air during photosynthesis?
Oxygen.
51
Why does ice float on water?
Ice is less dense than liquid water.
52
What causes day and night?
The rotation of the Earth.
53
How do fish breathe underwater?
They use gills to extract oxygen from water.
54
What happens to a shadow when a light source moves closer?
The shadow becomes larger.
55
Why do we see lightning before hearing thunder?
Light travels faster than sound.
56
How does the heart help in circulation?
It pumps blood throughout the body.
57
What adaptation helps camels survive in the desert?
Humps for fat storage, long eyelashes to block sand, and wide feet for stability.
58
What is the function of chlorophyll in plants?
It helps absorb sunlight for photosynthesis.
59
Why do birds have hollow bones?
To make their bodies lighter for flight.
60
Why do leaves appear green?
Because they reflect green light and absorb other colors.
61
How do plants absorb water from the soil?
Through their roots.
62
Why do humans have eyelashes?
To protect the eyes from dust and debris.
63
What is the main function of the lungs?
To help in breathing by exchanging oxygen and carbon dioxide.
64
What do we call the change of liquid water into gas?
Evaporation.
65
What happens when you mix red and blue paint?
You get purple.
66
What are the three primary colors of light?
Red, green, and blue.
67
Why do birds have beaks of different shapes?
To help them eat different types of food.
68
How do magnets work?
They attract materials made of iron, nickel, or cobalt.
69
What is the boiling point of water in degrees Celsius?
100°C.
70
What is the function of the kidneys?
To filter waste from the blood.
71
Why does the Moon not produce its own light?
It reflects light from the Sun.
72
What is the function of white blood cells?
To fight infections and diseases.
73
What causes ocean waves?
Wind blowing across the surface of the water.
74
Why do we wear light-colored clothes in hot weather?
They reflect heat, keeping us cool.
75
How do bats navigate in the dark?
They use echolocation.
76
Why does a metal spoon feel colder than a plastic spoon at the same temperature?
Metal conducts heat away from your hand faster.
77
How do chameleons change color?
By adjusting special cells in their skin.
78
What do we call an animal that is active at night?
Nocturnal.
79
What is the main function of the large intestine?
To absorb water and form solid waste.
80
Why do astronauts wear space suits?
To protect them from extreme temperatures and lack of oxygen.
81
Why do we see stars only at night?
Because the Sun’s light is too bright during the day.
82
How do plants get nutrients from the soil?
Through their roots.
83
What do we call animals that can live both on land and in water?
Amphibians.
84
Why do shadows change size during the day?
Because the angle of the Sun changes.
85
Why do birds migrate?
To find food and suitable weather conditions.
86
What happens when we mix blue and yellow paint?
We get green.
87
What do bees do to help plants grow?
They pollinate flowers.
88
Why do some animals have fur?
To keep them warm.
89
How do plants respond to sunlight?
They grow towards it.
90
Why do we need to drink water every day?
To stay hydrated and maintain body functions.
91
Why do some objects sink while others float?
It depends on their density relative to water.
92
How does a shadow form?
A shadow forms when an object blocks light.
93
What happens when warm air rises?
It cools down and may form clouds.
94
How does deforestation affect the environment?
It leads to loss of oxygen, wildlife habitat, and climate changes.
95
What happens if a food chain is disrupted?
The balance of the ecosystem is affected.
96
Why is it important to conserve water?
To ensure a sustainable supply for future generations.
97
What is rusting, and how can it be prevented?
Rusting is the oxidation of iron; it can be prevented by painting or coating iron.
98
Why do ice cubes melt faster in warm water?
Because heat energy is transferred faster to the ice.
99
How does the greenhouse effect impact global warming?
It traps heat, leading to rising temperatures and climate change.
100
How does friction help us in daily life?
It helps us walk, hold objects, and slow down moving vehicles.
101
Why do wet clothes dry faster on a sunny day than on a cloudy day?
Because the sun provides more heat for evaporation.
102
Why do camels have long legs?
To keep their bodies away from the hot sand.
103
How does a parachute help a person land safely?
It increases air resistance, slowing down the fall.
104
What is the role of red blood cells?
To carry oxygen throughout the body.
105
Why do metal objects feel colder than wooden objects at the same temperature?
Metal is a better conductor of heat, drawing heat away from your hand.
106
Why do icebergs float in water?
Because they are less dense than water.
107
How do wind turbines generate electricity?
By using wind to spin blades connected to a generator.
108
Why do desert animals usually have large ears?
To release heat and keep cool.
109
How does a compass work?
It aligns with Earth’s magnetic field to point north.
110
Why does salt help preserve food?
It absorbs moisture and prevents bacteria growth.
111
What is the greenhouse effect?
It’s the trapping of heat in Earth's atmosphere by gases like carbon dioxide.
112
How do submarines dive and float?
By controlling the amount of water in ballast tanks.
113
Why do we add chlorine to drinking water?
To kill harmful bacteria and make it safe to drink.
114
How do seeds travel to different locations for growth?
By wind, water, or animals.
115
What happens to light when it passes through a prism?
It splits into different colors (a spectrum).
116
Why do some leaves change color in autumn?
Because they stop producing chlorophyll.
117
Why does metal expand when heated?
Because heat causes molecules to move apart.
118
How does a refrigerator keep food fresh?
By slowing down the growth of bacteria with cold temperatures.
119
Why do giraffes have long necks?
To reach leaves high up in trees.
120
What causes the phases of the Moon?
The changing position of the Moon in relation to the Sun and Earth.
121
How do cacti survive in deserts?
They store water in their thick stems.
122
Why do fish have scales?
To protect their bodies and help them move through water.
123
Why do hot air balloons rise?
Because hot air is lighter than cool air.
124
How does a rainbow form?
When sunlight is refracted, dispersed, and reflected in water droplets.
125
Why do penguins huddle together?
To keep warm in cold temperatures.
126
How does sweating help regulate body temperature?
Sweat evaporates, cooling the skin.
127
Why do boats float on water but rocks sink?
Because boats have a lower density than water, while rocks are denser.
128
What happens when oil is mixed with water?
The oil floats on top because it is less dense.
129
What happens to light when it is acted upon by water droplets?
It is dispersed and reflected.
130
What happens when oil is mixed with water?
The oil floats on top because it is less dense than water.
131
How do plants transport water from roots to leaves?
Through xylem vessels.
132
Why does rubbing your hands together make them warm?
Because friction generates heat.
133
What would happen if the ozone layer was destroyed?
Harmful UV rays would reach Earth, increasing health and environmental risks.
134
Why does boiling water cool down when left uncovered?
Heat energy is lost to the surrounding air through evaporation.
135
How do simple machines make work easier?
By reducing the amount of force needed to perform tasks.
136
Why do astronauts wear special suits in space?
To protect them from extreme temperatures and lack of oxygen.
137
What would happen if there was no gravity?
Objects and people would float, and there would be no stable atmosphere.
138
How does the human body maintain a constant temperature?
Through sweating, shivering, and blood flow regulation.
139
What is the water cycle and why is it important?
It is the movement of water through evaporation, condensation, and precipitation; it ensures water availability.
140
What happens when you mix an acid and a base?
They neutralize each other, forming water and salt.
141
How does the moon affect ocean tides?
Its gravitational pull causes high and low tides.
142
What would happen if plants stopped photosynthesis?
Oxygen levels would drop, and food chains would collapse.
143
Why does the moon appear to change shape?
Because of the way sunlight hits it as it orbits Earth.
144
How does a solar panel generate electricity?
It converts sunlight into electrical energy.
145
What happens to water when it is cooled below 0°C?
It turns into ice.
146
Why do astronauts experience weightlessness in space?
Because they are in free fall around the Earth.
147
How do fish survive in freezing lakes during winter?
Water at the bottom of the lake remains liquid due to insulation from ice.
148
How do vaccines help protect against diseases?
They train the immune system to recognize and fight infections.
149
Why does boiling water produce bubbles?
Because water turns into steam, forming bubbles that rise to the surface.
150
What would happen if all decomposers disappeared from an ecosystem?
Waste and dead organisms would accumulate, disrupting the cycle.
151
Why does the Earth’s core remain hot?
Due to radioactive decay and heat from formation.
152
How do hydraulic brakes in cars work?
They use pressurized liquid to transfer force.
153
Why do astronauts appear weightless in space?
They are in free fall, orbiting Earth.
154
How does a solar eclipse occur?
When the Moon blocks sunlight from reaching Earth.
155
What would happen if Earth's gravity suddenly disappeared?
Everything would float into space.
156
Why do deep-sea fish often produce their own light?
To attract prey or communicate in darkness.
157
How does an air conditioner cool a room?
By removing heat and releasing cool air.
158
How do electric cars help the environment?
They reduce air pollution and carbon emissions.
159
Why do astronauts need oxygen tanks in space?
Because there is no breathable air in space.
160
What would happen if all the trees were cut down?
There would be less oxygen and more carbon dioxide, affecting climate and air quality.
161
Why do hurricanes form over warm ocean water?
Warm water provides energy for storm formation.
162
How do solar panels generate electricity?
By converting sunlight into electrical energy.
163
Why is space travel dangerous?
Because of extreme temperatures, radiation, and lack of gravity.
164
How does oil pollution affect marine life?
It contaminates water, harms sea animals, and destroys habitats.
165
Why does the Earth’s climate change over time?
Due to natural factors and human activities like pollution.
166
What happens when an ice glacier melts?
Sea levels rise, which can lead to flooding.
167
Why do submarines have to be pressurized?
To withstand high pressure in deep ocean waters.
168
How do antibiotics help fight bacterial infections?
By killing or stopping the growth of harmful bacteria.
169
Why do some animals hibernate in winter?
To conserve energy when food is scarce.
170
What would happen if there were no decomposers in an ecosystem?
Waste and dead organisms would accumulate, disrupting the cycle of nutrients.
171
How does ocean pollution affect humans?
It contaminates seafood, affects water quality, and disrupts ecosystems.
172
What is the difference between renewable and non-renewable energy?
Renewable energy can be replenished, while non-renewable energy is finite.
