Cells & Living Things
What is a cell?
The smallest unit of life.
Which plant part makes food?
The leaves make food for the plant.
Why is Earth called the Blue Planet?
Because most of Earth is covered by water.
What layer of gases surrounds Earth?
The atmosphere.
What star is at the center of our solar system?
The Sun.
What cell part controls the cell? What is it also called?
The nucleus. It is also known as the Control Centre.
What are the two ways plants reproduce?
The two ways are: seeds and spores.
What is precipitation?
It is water that falls from the air (rain, snow, sleet, hail).
Warm air does what: rises or sinks?
Warm air rises.
What force keeps planets moving around the Sun?
Gravity.
What are the five levels of organization from smallest to largest?
They are: cell → tissue → organ → organ system → organism
What tissue carries water upward through a plant?
The xylem.
Name the four main stages of the water cycle.
Evaporation, condensation, precipitation, collection.
Name two tools scientists use to predict weather.
Satellites, radar, or weather maps.
What is an orbit?
An orbit is the path an object follows around another object.
What is the difference between a vertebrate and an invertebrate?
A vertebrate has a backbone, an invertebrate does not.
What are the three things plants need for photosynthesis?
Plants need water, carbon dioxide, and sunlight for photosynthesis.
What causes ocean water to become saltier over time?
Evaporation removes water but leaves salt behind.
Why do oceans help control Earth's temperatures?
Because water heats and cools slowly.
Name four things found in the solar system besides the Sun.
Planets, moons, asteroids, comets.
Which kingdom contains organisms that cannot make their own food and absorb nutrients from dead organisms?
The kingdom is Fungi.
Name the plant structures involved in pollination and explain where seeds form.
Pollen moves from the stamen to the pistil, and seeds form in the ovary.
Put these water-treatment steps in order: filtration, disinfection, coagulation, sedimentation.
Coagulation → Sedimentation → Filtration → Disinfection
Explain how warm and cool air create wind.
Warm air rises and cool air sinks, creating air currents that form wind.
Which planet moves faster around the Sun: one closer to the Sun or one farther away? Explain why.
A planet closer to the Sun moves faster around it.