Science Exam Revision

Question 1

Ecosystem

Answer 1

an area that consists of biotic and abiotic components

Question 2

Component

Answer 2

A part of a larger whole

Question 3

Abiotic

Answer 3

non living component of an ecosystem

Question 4

Biotic

Answer 4

all living component of an ecosystem from animals to plants

Question 5

System

Answer 5

a collection of components

Question 6

Conservation

Answer 6

Not allowing resources to be wasted and using it efficiently

Question 7

Matter

Answer 7

Any substance that has mass and uses space to create volume

Question 8

Sustainable

Answer 8

Using natural resources efficiently so it can be used now and in the future

Question 9

Pathogen

Answer 9

A microorganism or any organism that causes or can cause a virus or a disease

Question 10

Infectious

Answer 10

A disease-causing organism that can be transmitted to others and is contagious

Question 11

Disease

Answer 11

An illness that has a negative impact on organisms and causes specific symptoms

Question 12

Multicellular

Answer 12

An organism that has multiple cells

Question 13

Unicellular

Answer 13

An organism with one cell

Question 14

Population

Answer 14

A number of all the organisms of the same specie who live in a particular area

Question 15

Environment

Answer 15

The surrounding of an organism where it lives or operates

Question 16

Biological Footprint

Answer 16

The amount of nature it takes to assist people or an economy

Question 17

Climate change

Answer 17

Long-term change in the average weather which affects the environment in negative ways

Question 18

Ecological Footprint

Answer 18

An ecological footprint is the amount of land and water that is needed to produce all the food, energy and products that a typical person uses

Question 19

Nitrogen Cycle

Answer 19

The nitrogen cycle is a series of processes by which nitrogen and its compounds are converted in the environment and in living organisms, including nitrogen fixation and decomposition

Question 20

Why is nitrogen important?

Answer 20

Plants need nitrogen for production of protein

Herbivores get nitrates from eating plants

Question 21

Antigen

Answer 21

An antigen is a foreign particle that triggers an immune response and the production of antibodies

Question 22

lymphocytes

Answer 22

Lymphocytes are a type of white blood type cell found in the blood of lymph nodes. They are made of bone marrow.

Question 23

Three lines of defense and provide examples.

Answer 23

The first line of defense involves physical barriers such as hair, skin, and mucus which work to prevent the entering of viruses into the body. The second line of defense involves chemical barriers such as fever, inflammatory response, and engulfing of antigens by phagocytes. The third line of defense targets pathogens that made it past the first and second line of defense. It involves t-cells that directly attack antigens or coordinate the activity of other immune system cells and b cells which produce plasma cells that produce antibodies that then attack antigens.

Question 24

Difference between ES and NS

Answer 24

The endocrine system functions using hormones(chemical) in the blood system whereas, the nervous system uses the nerves(electrical) in the body. The endocrine is slow acting but lasts for a long period of time. The nervous system is fast acting but lasts a shorter period of time. The endocrine system contains irreversible changes while the nervous system contains reversible changes.

Question 25

Non-infectious disease

Answer 25

Non-infectious disease is not passed or transmitted directly or indirectly from person to another. It is caused by genetic, malnutrition, etc.

Question 26

EPN

Answer 26

Electrons and Protons equal the same but neutrons different

Question 27

Oxygen Cycle

Answer 27

Explain