BYJUS SCIENCE GRADE 5 Flashcards
What does the solar system consist of
It consits of the sun and all the objects that revolve around it
8 Plantes, many satellites, comets and asteroids
What accounts for 99% of the mass of the solar system
The Sun
Which force keeps everything bound within the solar system
Gravitational Force
What is an Orbit
The curved path around which a celestial object revolves around the star planet or moon
Name the rocky planets in the solar system
Mercury, Venus, Earth Mars
Another name for Rocky planets
Terrestrial Planets
Why are the planets called Rocky planets
Because they are primarily made of Rocks and Metals
Name the only planet that revolves in the Goldilocks Zone
Earth
The core of the Earth is primarily made of
Iron and Nickel
The soil of the planet Mars is made of which chemical
Iron oxide
Name another planet that has an atmosphere and liquid water
Mars
Most of the planets rotate in which direction
Anti clockwise
Name the only planet that rotates clockwise
Venus
Venus has a very thick atmosphere
True or False
True
Name Planets which are Gas Giants
Jupiter and Saturn
The largest planet in the solar system
Jupiter
Name the planet with 60 moons
Saturn
The Gas Planets are chiefly made up of which two Gases
Hydrogen
Helium
Name the Planets that are Ice Giants
Uranus and Neptune
The Planets Uranus and Neptune appear blue, WHY
Because of a gas called Methane.
They absorb red light from the sun and reflect blue light
Most planets have a vertical axis of rotation. Name a planet that has an almost Horizontal axis of rotation
Uranus
Name two planets with an Icy core
Uranus and Neptune
Define a Satellite
An object that revolves around a larger object
Name the two types of satellites.
Man made & Natural
which is the satellite of the sun?
the earth
What powers the man-made satellite’s?
SOLAR PANELS and BATTERIES
HOW DOES THE MANMADE SATELLITE SEND & RECEIVE SIGNALS
via ANTENNA
how do man-made satellites help us?
- give us imformation on earth ,clouds,oceans,land
- help us to observe wildfires volcanoes ,smoke
Name the first man -made satellite?
SPUTNIK 1
IN THE YEAR 1957
Which country launched the first man-made satellite?
RUSSIA
What is a Solar eclipse?
When the moon comes between the earth and the sun
what is a lunar eclipse?
when the earth comes between sun and moon
Name the two kinds of shadows
UMBRA
PENUMBRA
How often does a solar eclipse and a lunar eclipse occur
Twice a year
Because the moon orbits the earth at an angle of 5 degrees relative to the earth sun plane
Can a lunar eclipse be seen with the naked eye
Yes
Can a solar eclipse be seen with a naked eye
NO. NEVER
A total solar eclipse can last for how long
As long as 8 minutes
How many phases does the moon have
8
Name the 8 phases of the moon
New Moon
waxing crescent
First quater
Waxing Gibbous
Full moon
Waning Gibbous
Third quater
Waning Crescent
When a moon is waxing does the moons surface get illuminated or darkened
Illuminated
When the moon is in a waning phase does the surface get illuminated or darkened
Darkened
How far is the moon from the earth
384000 Kms
All objects with mass exert a pulling force called
Gravity
As we move away from the earth, the gravitational force ……..
Decreases
The earth is made up of how many layers
Four
Name the four layers of the Earth
Crust
Mantle
Outer core
Inner core
The layer of the earth that we live on
Crust
The earths surface never changes
True or False
False
How thick is the crust layer of the Earth
The thickness varies. 5 kms the ocean floor to 70 kms on land
The thickest layer of the Earth is
Mantle
3000Kms deep
What is the Earths Mantle made up of
Silicate Rock containg Magnesium and Iron
The outer core of the Earth is made of
Liquid Iron and Nickel
Which layer of the Earth creates a Magnetic field
Outer Core
It creates a magnetic field that goes out into space and forms a protective barrier around the Earth
What is the Earths Inner core made of
Liquid Iron and Nickel
Which is the hottest part of the Earth
The Earths inner core
At about 5000 degree Celcius its as hot as the surface of the sun
The deepest place on Earth ever reached by human technology is
Kola Superdeep Borehole in Murmansk in Russia
What is the Tectonic plate made of
Combination of the crust and the outer Mantle
A crack in the earths crust is called a
Fault
About 300 million years ago there was one super continent called
Pangaea
The super continent Pangaea was surrounded by a single ocean called
Panthalassa
How was the Himalayas created
By the collison of two plates
The GONDWANA tectonic plate created which continents
South America
Africa
India
Australia
Antartica
The LAURASIA tectonic plate created which land mass
Eurasia
North America
An opening ( usually in the mountain) in the earths surface through which Magma, ash and Gas can esccape is called
Volcano
The hot liquid rock inside the volcano is called
Magma
The hot liquid rock once it leaves the volcano is called
Lava
Rocks are made of
Minerals
Rocks are classified into three types
Sedementary
Igneous
Metamorphic
Igneous rocks are formed from
Molten Rock
When the Lava cools it forms what type of rock
Basalt
When the Magma cools it forms what kind of rock
Granite
What does the word Igneous mean
Ignis, which means fire
A molecule of water is made up of
@ atoms of hydrogen and one atom of oxygen
Water can dissolve almost anything
True or False
True
Thats why ist called the universal solvent
Water naturally occurs in three states
Solid
Liquid
Gas
Water is a chemical
True or False
True
Why has water existed for millions of years on our Planet,
Because water is a very strong mlecule. The Bonds between hydrogen and oxygen are not easily broken
What fraction of the earths surface is covered by water
3/4th
The tension of the surface film of a liquid caused by the attraction of the particles in the surface layer by the bulk of the liquid,
Surface tension
The insects that are famous for walking on the surface of still water because of surface tension are
Water Striders
Why is water called the UNIVERSAL SOLVENT
Because it can dissolve a lot of substances
What percentage of the adult human body is amde of water
60%
2/3rds of the human body water is found inside the
Cells
the remaining is in body fluids like blood
The liquid part of blood is the
Plasma
An object can float in water if its density is less than water
True or False
True
Formula for density
Mass/Volume
As the mass of an object increases the density
Increases
Mass and density have a direct relationship
As the voulme of an object increases its density
Decreases
Volume and density have an inverse relationship
What happens to matter when it freezes
The voulume decreases
What happens to water when it freezes
Its volume increases
In its gaseous state water is present in two forms
Steam
Water Vapour
The most abundant chemical found in living organisms is
Water
The top life supporting layer of the earth is the
Soil
What is Topsoil
The uppermost layer of the soil that is 6 to 6 inches thick
Which layer of the soil has the highest concentration of organic matter and microorganisms
Topsoil
Most of the earths biological activity takes place in the topsoil
What is SOIL EROSION
When the topsoil is moved from one area to another
What are the main causes for soil erosion
Water and wind
What can prevent soil ersion to a large extent
Planting of trees
the trees hold the soil together with their roots
Most plants concentrate their roots in which layer of the soil
TOPSOIL
List 5 functions of the soil
- Medium for plant growth
- Habitat for organisms
- Foundation for buildings
- Watersupply and purification
- Recycling nutrients and organic waste
Soil erosion in the hIlls can be prevented by
Terrace Farming
Also known as Step farming
Prolonged soil erosion can make the land barren
True or False
True
Define a DISASTER
a phenomenon that causes damage to life, property and environment
Name the two types of disasters
Natural Disasters
Man Made disasters
What are natural disasters
Events caused by natural Forces
What causes an Earthquake
Movement of TECTONIC Plates on land causes the earth to tremble
Movement of the Tectonic plates on the ocean bed causes a
TSUNAMI
Giant waves
Intense scarcity of rainfall where peple suffer from shortage of water is called a
Drought
Excess rainfall causing rivers to overflow on dry land is called a
Flood
Name two man made disasters
Nuclear explosions
Oil Spills
Name two important disaster management organizations in India
- NDMA National disaster Management Authority
- NDRF National Disaster Response Force
What is a Water cycle
The process of movement of water from the earth and the atmosphere is called a water cycle
Can ice on earth directly evaporate into the air without changing into liquid state
Yes
The Earth contains a changing amount of water
True or False
False
The Earth contains afixed amount of water
Thw water is realeased from the plants surface through the
Stomata
The process of evaporation from the plants is called
Transpiration
When warm gas comes in contact with a cold surface it changes back to waht state
Liquid
This process is known as condensation
Conversion of water from a gaseous state to a liquid stae is known as
CONDENSATION
Which phenimenon is responsible for cloud formation
Condensation
As we go higher into the atmosphere the air gets hotter
True or False
False
Higher in the atmosphere the air gets cooler
How are clouds formed
Through the process of condensation when the water droplets stick to each other and to dust particles
The highest clouds hover at what height
60000 mts
What is PRECIPITATION
The process of water droplets from the clouds falling as rain
Precipitation in warm regions results in
Rain
Precipitation in cold regions results in
Snow
Where does the rain water end up
- GROUND WATER: Rainwater seeps into the ground and forms ground Water
- The rest flows into rivers, lakes, ponds and the sea. This is called COLLECTION
What percent of the water on Earth is fresh water
only 3%
The rest is salty water 97%
Of the 3 % fresh water, most of this water is found where
Most of it is frozen in polar ice caps and glaciers
Its too costly to get this water
The Freshwater available to us is of two types
- Surface water
- Ground water
Give a few examples of surface water
Rivers, lakes and ponds
What is Ground water
The water stored in the soil and rocks
How is ground water extracted
Through wells and hand pumps
Rajasthan occupies what percentage of Indias Land mass
10%
But has only 1.1% of Indias surface water
What is a renewable resource
A resource that can be recycled and reused
Is water a renewable resource
YES
At what temperature can water exist at vapour, liquid and solid state
0.01 degree celcius
What percentage of the human population lives in the worlds driest parts
85%
What is rainwater harvesting
The process of collecting and storing rain water
The roof top rain water harvesting has four parts . Name them
- Catchment
- Transportation
- Collection
- Distribution
What percentage of the earths water is salty in nature
97%
How does the human body loose water
Breathing
Sweating
Urination
Defeacation
When do we suffer from dehydration
When we loose more water than we can take in
Salt conatins a mineral called
Sodium
The chemical formula for Sodium is
Na
What is the chemical name of the common salt
Sodium Chloride
What can happen if we consume too much of salt
- Hypertension
- Heart Disease
What are the symptoms of Dehydration
- Headache
- Dry mouth
- Thirst
- Dry skin
- reduced urine
- Rapid heart rate
When our bodies are dehydrated what happens to the salt in our bodies
It increases
What are the four important uses of salt
- Improves the food tatse
- Preservative for food
- Oral care
- For cleaning
List the three factors that affect Evaporation
- Temperature
- Wind speed
- Surface area
More the surface area, will the evaporation be faster
Yes
How does wind speed affect Evaporation
Faster wind speeds will disperse the water vapour which in turn reduces the humidity and increases evaporation
How much of the Earths water evaporates every hour
50 Cubic Km
What is Temperature
It is the measure of Hotness or coldness of an object
What are the units of Temperature
- Fahrenheit
- Celsius
- Kelvin (K)
Human beings maintain a temperature at what level
37 degree Celsius
When it is cold outside how does the human body maintain its temperature
By Shivering
Shivering makes our muscles shake generating heat and keeping the body warm
In hot places how do we keep our bodies cool
By Sweating
What is the most comfortable temperature for human beings
20 to 25 degree celsius
Our body temperature is actually the temperature of our
Internal organs
Which part of the body does the elephant use to regulate its body temperature
Ears
The temperature of your breath is the same as the temperature of the human body
True or false
True
The direction of the air flow depends on ?
Temperature
How many breaths does an Adult take in a minute
10 to 12
The Hot air in the atmosphere rises up
True or False
True
The cool air sinks down
Why is the airconditioner always placed at a high level
Because the cool air always sinks down
Why is the room heater always plaved on the floor
Because the hot air always rises up
Name the reproductive part of the plant
Flower
The brightest flowers often have no fragrance
True or False
True
Sunflower, Dahlia, Skyrocket, hibiscus
Name this Flower
Dahlia
Name this flower
Sunflower
Name this flower
Skyrocket
Name this Flower
Hibiscus
Name this flower
Rafflesia Arnoldii
Name the worlds largest flower
Rafflesia Arnoldii
Where is the Rafflesia Arnoldii found
Rainforests of Indonesia
Name three plants with dull flowers
- Mango
- Banana
- Castor
The Rafflesia Arnoldii can weigh upto
6.8 Kgs
During the process of reproduction all flowers change to
Fruits
Name the worlds smallest flower
Wolffia
As big as a grain of rice
The flower buds are enclosed in green leaf like structure called
Sepal
What is the role of a Sepal
It protects the bud that later develops into a Flower
The male and the female reproductive parts of the plant are found within the
Petals
The male reproductive part of the plant is collectively called the
Stamen
The Stamen is made up of two parts
- The Thin stalk of the stamen is called FILAMENT
- The swollen head is called ANTHER
The Anther produces a grainy yellow powder called
Pollen
The female reproductive part of the plant is collectively called
PISTIL
The pistil is made of three parts name them
- Stigma, the sticky tip
- STYLE, long and thin tube
- OVARY. swollen structure that lies at the base
Name the three arts of the seed
- Embryo
- Stored food
- Seed coat
The part of the seed that develops into a new plant is the
EMBRYO
What is the role of the seed coat
It protects the embryo and the stored food from drying
What is Germination
When the embryo pushes out of the seed coat
Name the fruit that bears seeds on the outside
Strawberry
The embryo of the plant has one or two seed leaves called
COTYLEDONS
The first leaves of the baby plant are formed from the
Cotyledons
Plants with two cotyledons are known as
Dicots
Plants with a single cotyledon is known as
Monocot
Give examples of Monocots
Cereals like like wheat and maize
Give examples of Dicots
Pulses like chick peas, Kidney beans and piegon peas
Apple seed contains a deadly toxin called
Cyanide
Eating about 20 apple cores can kill an adult
The scientific name for the seed coat is
TESTA
All flowers have stamens and Pistils
True or False
False
Some do not have stamens and some do not have pistils
What is Pollination
The transfer of Pollen from the anther to the Stigma
Name a few Pollinators
Bees and insects
Bats and animals
Wind
Birds
You
Name a few Pollinators
Bees and insects
Bats and animals
Wind
Birds
You
The most common cause for seasonal allergies
Pollen
Parts of some plants can be used to grow new plants
True or False
True
What type of reproduction is VEGETATIVE PROPAGATION in plants
Its a type of asexual reproduction
The different methods of VEGETATIVE PROPAGATION is
- Cutting
- Layering
- Grafting
What is ASEXUAL REPRODUCTION in plants
Plants that reproduce without the fusion of the male and the female sex cells
What is Vegetative Propagation
Growing of a new plant from part of a parent plant
Give examples of Vegetative reproduction through CUTTING
- Underground stems: Potato and Ginger
- Underground roots: Sweet potato and beetroot
The worlds most expensive potato is
La Bonnotte
Describe the Process of Layering
- The stem of the plant is buried under the ground next to the parent plant.
- The tip of the stem is above the ground
- After some time roots grow on the buried stem
Name the plants that are grown through Layering
Blueberries, strawberries and raspberries
What is grafting
The act of placing a portion of one plant (bud or scion) into or on a stem, root, or branch of another (stock)
Name this plant
Indian Pipe Plant
Name this plant
Mistletoe
Name this Plant
Corpse Plant
Name this plant
Cuscuta
Why are pollinating flies attracted to the Corpse plant
Due to its powerful smell of rotting flesh
Give an example of a Camouflage
Leopard in the grass
The artic hare blending in the snow is an example of what defense stratergy
Camouflage
Name this Mimicry
Leaf Tailed Gecko
Name this Mimicry
Stick Insect
Name this Mimicry
Flower Mantis
Name this frog who secreates posion through its skin
Poison Dart frog
Name this frog whose poison is enough to kill 10 adults
Golden poison frog
Defense strategy of the porcupines and hedgehogs
Quills
What is the adaptation of Dolphins, Seals and Whales
BLOWHOLE
They cany breathe underwater. They have lungs just like us. They come to the surface and breathe through blowhole
What is the penguin adaptation
Penguins have flippers instead of wings that help them swim and survive in their habitat
Adaptation of Horses
Have hooves that helps them move on wetlands
Adaptation of the Elephant
Have rounded feet for body balance
Adaptation of chameleons
Have unique toes to grip branches
Name this animal who is noe extinct
Tasmanian Tiger
Name this animal who is extinct
Sabre toothed Cat
Why are Elephants poached
For their tusks
Why are tigers poached
For their skin
Why are Deers poached
For their antlers
What are complex carbohydrates made up of
many sugar molecules arranged in chains
Common adulterant of Salt or Sugar
Powdered Chalk
How can the turmeric adulterant be detected
Mix a teaspoon in a glass of warm water.DO NOT STIR. If it settles at the bottom , it is pure. If it dissolves it indicated an adulterant
how can the milk adulterated with water be detected
Put a drop of milk on a slope. If it leaves a white trail behind it is pure. If it flows without leaving a white trail it indicates the presence of water
How can milk adulteration with a detergent be detected
Add milk to water. Shake it thoroughly. If a thin layer of foam forms at the top it is pure. if a thick lather forms at the top it is adulterated
How can the adulterant sugar syrup in honey be detected
Add a spoonful of honey to a glass of water. If the honey disperses instantly it indicated the presence of a sugar syrup. Pure honey is heavy and it will sink to the bottom
What are the symptoms of Beri Beri
Weak muscles and very little energy to work
What are the symptoms of scurvy
- Bleeding gums
- Wounds take a long time to heal
What are the symptoms in Rickets
Bones become soft and bent
What are the symptoms of Goitre
The thyroid gland in front of the neck enlarges
The large Dome shaped muscles used in breathing is called
DIAPHRAGM
These grape shaped air sacs present in the lung are called
ALVEOLI
The exchange of Gases between the air and the blood takes place in which part of the lung
ALVEOLI
Alveoli are surrounded by tiny blood vessels
True or false
True
Name the four different types of teeth
- Incisors
- canines
- Premolars
- Molars
Excessive production of saliva is known as
Ptyalism aka Hypersalivation
The muscle flap at the top of the wind pipe is called
Epiglottis
What is the role of the stomach muscles
It churns the food and mixes it with the digestive juices
What is the role of the stomach muscles
It churns the food and mixes it with the digestive juices
The partially digested food from the stomach finally enters into the
Small Intestine
The inner wall of the small intestine is lined with millions of tiny finger like projections called
Villi
Water and the undigested food finally enters the
Large Intestine
The Excretory system is made of
- Kidneys
- Ureters
- Urinary Bladder
- Urethra
The organ that stores the urine after it is formed is the
Urinary bladder
Urine produced in the kidney is carried to the Urinary bladder via the
Ureters
This band of muscle found at the end of the Urinary Bladder and which controls the flow of urine is called
Sphincter Muscle
What makes up the Muscular system
All the muscles of the body make up the muscular system
Name this muscle
Biceps
The important muscle at the back of the upper arm is
Triceps
The muscle at the front of the thigh is called
Quadriceps Muscle
The group of muscles at the back of the thigh are called
Hamstring Muscles
Name the strongest muscle in the body
The jaw muscle called the MASSETER
This strong connective tissue that holds the bone together in a movable joint is called
Ligament
The tissue that connects the muscle to the bone is called
TENDON
This tissue that covers the end of the bones and acts as a cushion preventing the bones from rubbing against each other is called
Cartilage
The set of bones that protects the Brain is called
SKULL
The breastbone is also known as
Sternum
Another word for the SPINE or Backbone is
VERTEBRAL COLUMN
Give two examples of the Ball and Socket joint
- Shoulder joint
- Hip Joint
The ball and socket joint allows movement in which direction
All directions
Give examples of Hinge Joints
- Elbow joint
- Knee Joint
Give two examples of a PIVOT Joint
Neck joint
Elbow Joint
Give an example of Immovable joint
Skull
What is the Central Nervous system made up of
Brain and Spinal cord
What is the Peripheral Nervous system made up of
The nerves coming out of the Brain, the spinal cord
Which organ of the body contains the maximum amount of fat
Brain. It contains 60% of fat
The three parts of the Human Brain are
- Cerebrum
- Cerebellum
- Brainstem
The second largest part of the human brain is the
Cerebellum
The part of the cerebrum that is responsible for Vision is the
Occipital lobe
Give two important functions of the TEMPORAL LOBE
TEMPORAL LOBE
1. hearing
2. Short term Memory
Give Important functions of the FRONTAL LOBE
Frontal LOBE
1. Intelligence
2. Speech
3. Movement
List two important function of the PARIETAL LOBE
- Body Orientation. It tells us if we are standing, sitting, lying etc
- Processes all sensory information like touch, temperature, pain etc
The part of the brain that controls our breathing and our heart rate is the
BRAINSTEM
There are more cells in our Brain than the stars in the Milky way.
True or false
True
When awake our brains have enough energy to
Light a small bulb
In Biology what is a TRAIT
The characteristic features of an Individual is called a TRAIT
What are inherited Traits
Traits passed from one generation to the next
What are acquired traits
Traits that we pick up during the course of our lifetime
Siblings that look the same are called
Identical twins
Polio is a disease caused by a
VIRUS
Mendel did his experiments on which plant
Pea Plant
What is a simple fracture
When the bone is broken into two or more pieces but the broken end of the bone does not come out through the skin
How are fractures treated
By putting a cast
This cast can be made up of what type of material
- Plaster of paris
- Fibreglass
Name this canadian stuntman who holds the record for the most number of broken bones. 433 fractures
Evel Knieval
Which part of the brain controls and maintains body temperature
Hypothalamus
