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Questions and Answers

What is the function of the nucleus in a cell?

To provide energy for the cell

To regulate cell growth

To synthesize proteins

To store genetic information (correct)

Which structure is only found in plant cells?

Mitochondrion

Cell membrane

Cytoplasm

Chloroplast (correct)

What is the function of cell wall in plant cells?

To synthesize proteins

To regulate cell growth and division

To store genetic information

To provide structural support and protection (correct)

What is the function of mitochondria in cells?

To provide energy for the cell Signup and view all the answers

Which particle model represents a solid element?

Model D Signup and view all the answers

Which particle models represent pure compounds?

Model B and Model E Signup and view all the answers

Which particle model represents a mixture of elements?

Model F Signup and view all the answers

Which particle model represents a mixture of compounds?

Model E Signup and view all the answers

What is the state of mercury at room temperature?

Liquid Signup and view all the answers

What is an alloy?

A mixture of two or more metals Signup and view all the answers

What type of energy is converted when Oliver jumps into the water?

Kinetic energy Signup and view all the answers

What does it mean when energy dissipates during an activity?

Energy is lost as heat Signup and view all the answers

What is the process that occurs at a tectonic plate boundary?

Plate tectonics and magma formation Signup and view all the answers

What is the result of the interaction of tectonic plates at the boundary?

All of the above Signup and view all the answers

What is the significance of the magma in the diagram?

It is a byproduct of plate tectonics Signup and view all the answers

What is the main feature of the tectonic plate boundary in the diagram?

A convergent boundary Signup and view all the answers

What is the purpose of the teacher's experiment in the investigation?

To compare the growth of different plant species Signup and view all the answers

What happens to air particles when a loudspeaker makes a sound?

They start to vibrate back and forth. Signup and view all the answers

Why does Mia's method of measuring growth not give accurate results?

Because she does not account for the mass of the water Signup and view all the answers

Why does sound not travel through a vacuum?

Because sound requires a medium to travel through. Signup and view all the answers

What is the advantage of Jamila's method of measuring growth?

It is a direct measurement of growth Signup and view all the answers

What is the function of the meter in Lily's electrical circuit?

To measure the current in the circuit Signup and view all the answers

What is the process by which water falls from clouds?

Precipitation Signup and view all the answers

What is the purpose of Mike's investigation?

To compare the pH of different substances Signup and view all the answers

What is the average current for 5 lamps in Lily's experiment?

0.25 A Signup and view all the answers

What does Mike use to measure the pH of each substance?

A pH meter Signup and view all the answers

What is the process of water vapour changing into liquid water?

Condensation Signup and view all the answers

What is being investigated in the Class 7 experiment?

The growth of five different plant species. Signup and view all the answers

What is the process of liquid water changing into water vapour?

Evaporation Signup and view all the answers

What do hazard symbols A and B indicate on the battery of cells?

Flammable and corrosive Signup and view all the answers

What is the purpose of Lily's investigation?

To investigate the effect of the number of lamps on the current Signup and view all the answers

What is the role of electrons in determining whether a material is a conductor or an insulator?

Electrons flow freely in conductors, but not in insulators Signup and view all the answers

What is the name of the meter used to measure current?

Ammeter Signup and view all the answers

What is a secondary information source?

A report or document about an event. Signup and view all the answers

What is the anomalous current reading in Lily's experiment?

1.30 A Signup and view all the answers

What happens to the current when the number of lamps is doubled in Lily's experiment?

The current is halved Signup and view all the answers

What is the main difference between electrical conductors and electrical insulators?

Conductors have a low resistance, while insulators have a high resistance Signup and view all the answers

What causes tidal forces on Earth?

The force of attraction between the Earth and the Moon Signup and view all the answers

What is the term for the process by which water moves from the ground to the air?

Transpiration Signup and view all the answers

How does the current change when the number of lamps in a circuit is increased?

The current decreases Signup and view all the answers

Study Notes

Cell Structure

Animal cells have cell membrane, cytoplasm, mitochondria, and nucleus, but no cell wall or chloroplast.
Plant cells have cell wall, chloroplast, and sap vacuole, but not found in animal cells.

Particle Models

Particle model A represents a solid element.
Particle models B and C represent pure compounds.
Particle model D represents a mixture of elements.
Particle model E represents a mixture of compounds.
Mercury is a liquid at room temperature, and its particle model consists of atoms close together but able to move freely.

Energy

When Oliver makes a splash in the water, some of his energy is converted into sound energy and some into thermal energy.
Energy dissipates during an activity, meaning it is wasted or converted into a less useful form.

Tectonic Plate Boundaries

Three events that occur near a tectonic plate boundary are:
- Earthquakes
- Volcanic eruptions
- Formation of mountains

Water Cycle

Process A is evaporation, where liquid water changes into water vapour.
Process B is condensation, where water vapour changes into liquid water.
Process C is precipitation, where water falls from clouds.

Investigation

A secondary information source is a published work or research that has already been conducted and published.
Mia's method of measuring growth by finding the mass of each plant pot and soil does not give accurate results because it measures the mass of the soil and pot, not the plant itself.
Jamila's method of measuring growth by calculating the average height of the seedlings is reliable.
A safety precaution the teacher takes is to ensure the seeds are not overwatered.

pH Investigation

Mike uses pH indicators to test the pH of milk, vinegar, and bleach.
The method involves adding pH indicators to each substance and observing the resulting color.
Mike can make a conclusion about the pH of each substance based on the color change.

Electrical Circuit

The battery of cells has hazard symbols, with A indicating explosive and B indicating corrosive.
The meter used to measure current is an ammeter.
As the number of lamps in the electrical circuit increases, the current decreases.
The anomalous current reading is 1.30 A for 3 lamps.
The average current for 5 lamps is 0.24 A.
As the number of lamps is doubled, the current halves.

Tidal Forces

Tidal forces on Earth are due to the gravitational force of attraction between the Earth, Moon, and Sun.

Electrical Conductors and Insulators

Electrical conductors have free electrons that can move freely, allowing them to conduct electricity.
Electrical insulators have electrons that are tightly bound to their atoms, making it difficult for them to conduct electricity.

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