Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Year 7 Science > year 7 science > Flashcards

year 7 science Flashcards

You may prefer our related Brainscape-certified flashcards:
Biology 101 flashcards
1
Q

What are the components of a plant cell?

A

Ribosomes
Nucleus
Cell membrane
Cytoplasm
Mitochondria

Chloroplast
Cell wall
Vacuole

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the function of ribosomes?

A

Site of protein synthesis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the components of an animal cell?

A

Ribosomes
Nucleus
Cell membrane
Cytoplasm
Mitochondria

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the function of the nucleus?

A

Stores genetic material (DNA)
Controls the cell and cellular function

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the function of the mitochondria?

A

Site of respiration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the function of the cytoplasm?

A

Provides an aqueous environment for cellular reactions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the function of the cell membrane?

A

Separates the intracellular and extracellular environments and provides a selectively permeable barrier for molecules to move in and out of the cell

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the function of the cell wall?

A

Provides strength, structure and stability to the plant cell

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the function of the chloroplasts?

A

Site of photosynthesis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Where in the plant are chloroplasts found?

A

Green parts of the plant, mostly the leaves/ stem

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the function of the vacuole?

A

Maintains the water balance of the plant cell and provides turgor pressure to help maintain plant strength and shape

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What organelles are only found in plants?

A

Vacuole
Cell wall
Chloroplasts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Components of the cardiovascular system?

A

Heart
Blood vessels; arteries, veins and capillaries

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the function of the cardiovascular system?

A

Maintains and adequate and effective blood supply around the body to ensure oxygenated blood reaches metabolically active tissue

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Components of the digestive system?

A

Pancreas, large intestine, small intestine, stomach, oesophagus, liver, mouth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the function of the digestive system?

A

To digest ingested food and absorb sufficient nutrients and excrete indigestible material

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are the components of the endocrine system?

A

Pituitary gland
Pancreas
Adrenal gland
Thyroid
Ovaries/ tetes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the function of the endocrine system?

A

Involved in hormonal response and feedback to normal body function

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What are the components of the
musculoskeletal system?

A

The bones and muscles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the function of the skeletal system?

A

To stand upright and be able to move. To also carry out voluntary movements.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is the function of the respiratory system

A

To allow ventilation and carry out gas exchange

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What are the components of the respiratory system?

A

Lungs
Respiratory muscles
Rib cage
Air way

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is the function of the reproductive system

A

To produce viable gametes capable to produce offspring

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What is the function of the immune system?

A

To defend against illnesses and fight against infections

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What are the components of the immune system?

A

lymph nodes
Bone marrow
Spleen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What is the function of the nervous system?

A

To co ordinate neural activity from sensory organs
To effector organs.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What are the components of the nervous system?

A

Peripheral nerves
Brain
Spinal cord

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

What is the function of a red blood cell?

A

It carries oxygenated blood from the lungs to metabolically active tissue.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

What are the adaptations of a red blood cell?

A

It does not have a nucleus. Packed with haemoglobin. It has a very small diameter.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

What is the function of a neuron?

A

It carries electrical impulses to co-ordinate neural activity.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

What is the lifespan of a red blood cell?

A

120 days.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

What is a control variable?

A

variable that does not change.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

What is an independant variable?

A

a variable that can be changed or manipulated.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

What is a dependant variable?

A

a variable that is being tested or measured.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

Why do we need to breathe out?

A

To release carbon dioxide.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

Why do we need to breathe in?

A

To take in oxygen.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

What is the definition of precise?

A

How close the repeats are to each other.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

What is the definition of accurate?

A

How close your results are to the correct value.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

What is diffusion?

A

Movement of particles from a region of high concentration to a region of low concentration. This movement is down a concentration gradient.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

What is osmosis?

A

The movement of water from a region of high concentration to a region of low concentration across a partially permeable membrane. Down a concentration gradient.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

What is active transport?

A

Movement of particles to a lower region of particles to a higher concentration of particles. This against concentration gradient and requires energy from ATP.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

What is the function of the bone marrow?

A

Produces blood cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

What are the features of a good exchange surface?

A

Good blood supply to maintain good diffusion gradient.
A short diffusion distance.
Large surface area.
Good ventilation to maintain diffusion gradient.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

What is the function of a joint?

A

Generates movement in certain planes and directions to allow purposeful movement.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

What are the different types of joints?

A

Hinge joints.
Fixed joints.
Ball and socket joints.
A pivot joint

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

What is a synovial joint?

A

When the two ends of the bones are encased in a membrane and has a circulating fluid in the joint space.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

What is the function of synovial fluid?

A

Act as lubricant for the joint to aid movement and reduce friction. Also nourishes the joint.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

What is a ligament?

A

A piece of tissue that holds two bones together.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

What is a tendon?

A

A piece of tissue that connects muscle to a bone.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

What is the fomular to calculate the total magnification?

A

Eyepiece lense ×objective lense

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

Why do we need the stain samples to view them under a microscope?

A

Because cell samples are colorless and by staining them, they are become visable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
50
Q

What is the main hormone responsible adolescence in females?

A

Oestrogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
51
Q

What is the main hormone responsible adolescence in males?

A

Testosterone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
52
Q

What changes do females undergo during puberty?

A

Breasts develop
ovaries start to release egg cells
periods start
hips widen
pubic hair starts to grow
underarm hair

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
53
Q

What changes do men undergo during Puberty in males?

A

voice breaks
testes and penis get bigger
testes start to produce sperm
shoulders widen
facial hair grows

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
54
Q

What does universal indicator show:

a)How strongly acidic or alkaline a solution is?
b) Whether a solution is acidic or alkaline?
c) how much water a solution has?

A

B.) w

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
55
Q

What range of value on universal indicator, indicate acidic solution?

A

0-7

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
56
Q

What range of value on universal indicator, indicate alkaline solution?

A

7-14

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
57
Q

What range of value on universal indicator, indicate neutral solution?

A

7

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
58
Q

What condition is needed to measure the pH of a substance?

A

it must be dissolved in water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
59
Q

what is neutralisation?

A

It is when an acid and an alkaline react to form water

60
Q

what is seen when red litmus paper is dipped in an acidic solution?

A

it stays red

61
Q

what is seen when red litmus paper is dipped in an alkaline solution?

A

it turns blue

62
Q

what is seen when blue litmus paper is dipped in an acidic solution?

A

it turns red

63
Q

what is seen when blue litmus paper is dipped in an alkaline solution?

A

it stays blue

64
Q

What is an acid?

A

it is a solution with a pH below 7, and all of their molecules can release hydrogen ions.

65
Q

What are some examples of acids?

A

Hydrochloric acid, citric acid, carbonated drinks, vinegar

66
Q

What is an alkali?

A

it is a base that dissolves in water and has a pH above 7

67
Q

what are examples of alkalis?

A

soap, toothpaste, bleach, sodium hydroxide

68
Q

What are the danger properties of acids?

A

They are corrosive, flamable, causes burns and can be a skin irritant

69
Q

what are the useful purposes of neutralization?

A

Neutralisation of acidic soil, taking indigestion tablets for too much acid in the stomach, in lakes and ponds to neutralise water.

70
Q

What is produced when an acid reacts with a metal?

A

it will produce salt and hydrogen.

71
Q

What is produced an alkali/base reacts with an acid?

A

it produces salt and water

72
Q

What is produced when an acid reacts with a carbonate?

A

salt, water and carbon dioxde

73
Q

How long does it take for the earth to complete a full orbit around the sun?

A

365 days and 6 hours

74
Q

Is the sun a star or a planet?

A

It is a star

75
Q

What is the definition of a solar system?

A

a sun and all the objects that orbit it

76
Q

what is the solar system?

A

a star and all the objects that orbit it

77
Q

what are the components of the solar system?

A

Stars , galaxies, planets, moons, satalittes ,asteroids , comets, dust and gas

78
Q

What planets make up our solar system?

A

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

79
Q

what are terrestrial planets and examples of these?

A

planets that re made up of mostly rock and metal and have a solid surface and these are Mercury , Earth, Venus and Mars

80
Q

which planet is the hottest planet in the solar system?

A

Venus

81
Q

what is a gas giant planet and some examples?

A

it is a massive planet that is made up of hydrogen and helium gas ,they are also surrounded by rings and moons. Jupiter
Saturn, Uranus and Neptune.

82
Q

What is an Asteroid?

A

They are large piece of rock that orbit the sun.

83
Q

Where is the Asteroid belt found?

A

It is found between mars and Jupiter

84
Q

What is a dwarf planet?

A

They are planets that are too small to be considered to be a planet

85
Q

How many dwarf planets are there in our solar system?

A

There are 5

86
Q

What is a comet?

A

They are things in the solar system that are made up of rock and ice

87
Q

What is an orbit?

A

an orbit is a path followed by an object in space?

88
Q

How long is one day?

A

24 hours

89
Q

What happens in one day?

A

The earth complete one rotation on its’ axis

90
Q

what happens when we experience day time?

A

The earth’s face is pointing towards the sun

91
Q

what happens when we experience nightime?

A

The earth is facing away from the sun

92
Q

what happens in the time of a year?

A

the earth completes one full orbit around the sun.

93
Q

Why do we have seasons?

A

Because the earth is tillted on an axis

94
Q

What is the size of the Earths’ tilt?

A

23 degrees

95
Q

What are the four seasons?

A

spring, summer, autumn and winter

96
Q

What is a month?

A

It is the time it takes for the moon to orbit the Earth once, 29.5 calendar days

97
Q

What is a force?

A

it is a push or pull acting on an object due to its interaction in another object.

98
Q

what is the unit of a force ?

A

it is measured in Newtons

99
Q

what are examples of contact forces?

A

Friction, tension, air-resitance , up-trust
normal reaction force.

100
Q

what are examples of non-contact forces?

A

magnetic force, electrostatic force and gravitational force

101
Q

what is tension?

A

it is a pulling force exerted by an object,
by a string.

102
Q

what is friction?

A

when two objects slide past eachother, they exert frictional force.

103
Q

what is up-trust?

A

An upward force an object experiences when submerged in a fluid.

104
Q

what is air-resistance?

A

it is the force and object experiences as it moves through air.

105
Q

what is a normal reaction force?

A

The forces acting between an object and a surface.

106
Q

what is a magnetic force?

A

the forces experienced by a magnetic material when placed in a magnetic field.

107
Q

what is an electrostatic force?

A

it is the force experienced by a charge particle in an electric field.

108
Q

what is a gravitational force?

A

a force experienced by an object with mass when it is suficiently close to another object with mass

109
Q

what effect can a force have on an object?

A

it can change the speed of a moving object, change the direction and change the shape.

110
Q

what is Hooke’s law?

A

when the force applied to an elastic object is directly proportional to the extention, provided the limit of proportion is not exceeded.

111
Q

What is the difference between a transparent and translucent material?

A

when a material is translucent- allows light to pass through but causes it to diffuse.
when a material is transparent - it allows objects to transmit light fully

112
Q

What is the law of reflection?

A

it is when the angle of incidence is equal to the angle of reflection

113
Q

what is a light year?

A

The distance traveled by light in the space of one year

114
Q

what is specular reflection?

A

when light is reflected from a smooth surface

115
Q

what is diffuse scattering?

A

when light is reflected off a rough surface

116
Q

what does a lens do to light?

A

refracts the light wave as it passes through causing it to change direction and speed

117
Q

List the planets in the solar system, in size order starting with the smallest to the biggest

A

Mercury
Mars
Venus
Earth
Neptune
Uranus
Saturn
Jupiter

118
Q

What is the evidence for the Earth spinning on it’s axis?

A

Because we have day and night

119
Q

what are the phases of the moon?

A

new moon
cresent
first quarter
gibbous
full moon
gibbous
third quarter
cresent

120
Q

What is the function of a stop clock?

A

A device used to measure the time taken

121
Q

What is the function of a measuring cylinder?

A

To measure the volume of a liquid

122
Q

What is the function of a weighing scale?

A

To measure the mass of a substance

123
Q

What is the difference of a test tube and a boiling tube?

A

A boiling tube is wider and bigger than a test tube

124
Q

What is a gas syringe used for?

A

it is used to measure the volume of a gas produced in a reaction

125
Q

What is an atom?

A

It is the smallest component that can take part in a chemical reaction

126
Q

What are the components of an atom?

A

Proton, neutron and electron

127
Q

What is the charge on a proton?

A

it is positive

128
Q

what is the charge on an electron?

A

it is negative

129
Q

what is the charge on a neutron?

A

it is neutral

130
Q

what components of an atom are found in the nucleus?

A

protons and neutrons

131
Q

What is an element?

A

it is a chemical substance made of only one type of atom

132
Q

What is a compound?

A

it is a chemical substance made up of two or more different elements that are chemically bonded together

133
Q

what is the periodic table?

A

it is an internationally recognised organisation of elements

134
Q

what are the two types of waves?

A

longitudinal and transverse

135
Q

what are three properties of a wave?

A

amplitude, frequency and wavelength

136
Q

What is the definition of amplitude?

A

it is the furthest displacement of the wave from the mean position

137
Q

what is the frequency of a wave?

A

it is the number of oscillations per unit time

138
Q

what is the wavelength?

A

it is the distance between two identical points on two consecutive waves

139
Q

what property of waves determines volume of sound?

A

it is the amplitude

140
Q

what property of waves determines the pitch of sound?

A

it is the frequency

141
Q

what type of wave is sound?

A

longitudinal

142
Q

what is the definition of a transverse wave?

A

it is a wave with oscillations perpendicular to the direction of energy transfer

143
Q

what is the definition of a longitudinal wave?

A

it is a wave with oscillations parallel to the direction of energy transfer

144
Q

what are examples of chemical alkalis?

A

ammonia, sodium hydroxide, potassium hydroxide, calcium hydroxide

145
Q

What is a group on a periodic table?

A

is is the vertical column which corresponds to the number of electrons of the outer shells of the element

146
Q

what is a period on the periodic table?

A

it is the horizontal rows which corresponds to the number electron shells in the atom

147
Q

what is the property of all group 8 elements?

A

they are inert and do not react

148
Q

What is the boiling point of water?

A

it is 100 degrees celcius

149
Q

what is the melting point of water?

A

0 degrees celcius

Year 7 Science (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions