grade 9 science

Question 1

What is the meaning of ‘ecology’?

Answer 1

Ecology is the study (“ology”) of ecosystems (“eco”) – the environment and the living things that interact in it.

Question 2

Explain the relationship between biotic factors and abiotic factors

Answer 2

Biotic factors are living organisms in an environment. Abiotic factors are the non-living parts of that environment. They interact, because biotic factors are affected by abiotic factors.

Question 3

Define ‘biotic’. Use that to define ‘biotic factors’. Provide at least two examples.

Answer 3

‘Biotic’ means living. Therefore, ‘biotic factors’ are the living organisms in an environment. Examples: fungi, plants, animals, bacteria.

Question 4

Define ‘abiotic’. Use that to define ‘abiotic factors’.

Answer 4

‘Abiotic’ means non-living (it does NOT mean DEAD). Therefore, ‘abiotic factors’ are the non-living parts of an environment that have an effect on the living ones. Examples: sun, wind, water, precipitation, soil, rock…

Question 5

List the points of the Particle Theory of Matter.

Answer 5

1. All matter is made up of tiny particles
2. Pure substances each have their own unique type of particle
3. Particles are always moving. Always.
4. Particles at higher temperatures are moving faster (with more energy) than particles at lower temperatures (with less energy).
5. Particles are attracted to each other.

Question 6

a plant is eaten by a rabbit and the rabbit is eaten by a coyote. name the producer, the primary consumer, and the secondary consumer.

Answer 6

Plant : producer
Rabbit: primary consumer
Coyote: secondary consumer

Question 7

what is the name and chemical formula of the compound if you combine sulfur and magnesium?

Answer 7

MgS and Magnesium Sulfide

Question 8

How do you use a Bohr Rutherford diagram? How would you draw one and how do you find how many electrons there are.

Answer 8

In the middle of the Bohr Rutherford diagram shows how many protons and neutrons there are and the first ring can hold 2 electrons the next is 8 and the next ring is 8 and all rings after are 8.

The way you know how many electrons there are is the number over the symbol (e.g

Question 9

How much voltage (V) is there if you have 3A and 3Ω? Show your work

Answer 9

V= 3A x 3Ω

V= 9V

Question 10

How would you draw a Bohr Rutherford diagram?

Answer 10

In the middle of the Bohr Rutherford diagram shows how many protons and neutrons there are and the first ring can hold 2 electrons the next is 8 and the next ring is 8 and all rings after are 8.

Question 11

Give an example of a insulator and a conductor and explain how they are an insulator and a conductor

Answer 11

insulator: rubber
conductor: metal rod
An insulator contains the electricity. A conductor allows electricity to move along/through it.

Question 12

Why do we almost never have missions to go to space

Answer 12

there is tons of preparation and money involved, so we do not want to waste our money on a failed space mission

Question 13

How does the Aurora Borealis form?

Answer 13

Aurora Borealis forms when charged particles formed from the sun are emitted during a solar flare penetrate the earth’s magnetic shield and collide with molecules and atoms and cause a small burst of light known as a photon which is what the Aurora Borealis is made of.

Question 14

How does the Aurora Borealis form?

Answer 14

Aurora Borealis forms when charged particles formed from the sun are emitted during a solar flare penetrate the earth’s magnetic field

Question 15

Explain the role of a resistor in an electric circuit.

Answer 15

The resistor’s job is to slow down the flow of electrons (the current). It does this so that other loads can function properly.

Question 16

Compare and contrast these celestial bodies:
comets
meteors
asteroids
meteorites
meteoroids

Answer 16

The are all the same because they are found in near and deep space. They all have at least part of their makeup as rock.
Differences:
Comets are made mostly of ice. Their ‘tails’ are the sublimating ice as it heats up while passing near the Sun.
Asteroids are made of rock. They do not have tails and are generally larger than the other bodies in this list.
Meteoroids are made of rock. They are smaller than asteroids and can enter the atmosphere of our planet if they pass too closely.
Meteors are meteoroids as they enter our atmosphere and burn up. The light of a shooting star is a meteor.
Meteorites are meteoroids that survive passing through our atmosphere as meteors and land on Earth.