When solids meet their melting point they become what?
Liquids
100
True or false? A round magnet does not have North and South poles?
False. All magnets have a North and South pole.
100
State a reason why a seed can germinate in a dimly lit place?
It is because that the seed does not need light energy during germination as it contains within its food supply.
100
What is energy?
Energy is something that causes things to happen.
100
True or false? Plants have 1 phloem tube wrapped around 1 xylem tube.
False.The number of xylem and phloem tubes increases as a plant grow.
200
A rock, water, and air are all made up of what?
Matter
200
True or false? The south pole of a magnet is stronger than the north pole of a magnet.
False. North and South poles are equal in magnetic strength.
200
The life cycle of a plant has ________stages. They are what?
3 stages. Seed, young plant and adult plant
200
Name 4 types of natural light source.
stars, the sun, firefly, fire
200
Why are plants a system?
Plants are a system because the roots, stem and leaves work together to keep plants alive.
300
True or false?
Solids do not take the shape of the container they are in.
True. Liquids take in the shape of the container they are in.
300
Which is false?
A) Magnets get weaker as they get hotter
B) Magnets get stronger as they get colder
C) Magnets get weaker as they get colder
B. Extreme temperatures misaligned groupings of atoms and weakens the magnetic strength.
300
True or false? The third life stage of a butterfly is called nymph.
Nymph is the second life stage of certain insects such as grasshoppers and cockroaches.
300
How do we know that light travels in straight lines?
Shadows are evidence of light travelling in straight lines. Light fills up all of the space, hits an opaque object that blocks light, forming a shadow behind.
300
What is the function of xylem tubes?
Xylem tubes transfer water and dissolved mineral salts absorbed from the soil by the roots to other parts of the plant.
400
What are the properties of a liquid?
(answer in terms of particles bond)
The particles bonds are not as strong and tight as those in solids. They flow together and take up the shape of the container.
400
How do insects breathe?
Insects breathe in and out of openings through their thorax.
400
Explain in steps how a metal spoon becomes hot when placed in a cup of hot water.
1) Heat from hot water travels to the colder metal spoon.
2) Heat energy continues to travel from hotter end to the colder handle
3) The handle becomes hot when heat energy reaches it.
400
Explain the effect to a plant if its phloem tubes are damaged.
Damaged phloem tubes may disrupt the transfer of food made in the leaves to the roots. Overtime, food will accumulate at the place above the damaged site causing the area to bulge. Eventually the plant will die from its roots' lack of food supply.
500
When water freezes into ice, the matter that makes up the water -
A) has a greater temperature
B) becomes energy
C) has not changed
D) becomes a living organism
C
500
When you break a magnet in half, you will get ...
Two smaller size magnets with each have a North and South poles and their magnetic strengths may be weaker than the original whole magnet.
500
Breathing in plants is the process of-
A) converting glucose to oxygen
B) converting oxygen to glucose
C) taking in air and giving out carbon dioxide
D) taking in air and giving out oxygen
D. Plants take in air, use the carbon dioxide to help convert food into glucose and give out oxygen.
500
When a substance is heated the particles gain energy and spread out, creating more volume (spaces between the particles).
What happens to the mass of a substance when it is heated?
Mass remains the same.
Heat energy does not have mass or volume therefore the substance gaining heat does not increase its mass.
500
Explain why the cut roses in my vase die after 1 week?
Cut flowers' xylems are detached from the roots therefore deprived of nutrients. In addition, cut branches usually have few leaves attached to undergo photosynthesis to make enough food for the flower.