Unit 1
What is photosynthesis?
Turning light into food for plants.
What are the uses of nutrients?
1. To provide energy.
2. To provide materials for our cells to properly function.
What makes up the circulatory system?
The heart and blood vessels.
Name the two new substances that are made when glucose reacts with oxygen inside a cell?
water and carbon dioxide
What is fertilization?
When the nucleus of an egg cell and the nucleus of a sperm cell meet.
Why would most plants die very quickly after their roots are cut off?
A plant needs its roots to produce water.
What is the digestive system?
A system that helps us break down food and absorb nutrients from them.
Which two chambers contain oxygenated blood?
upper chamber and the lower chamber
What is the purpose of the respiratory system?
Get oxygen from the air into your blood and get rid of carbon dioxide.
What is formed when the nucleus of a sperm cell and the nucleus of an egg cell meet?
A zygote.
What are needed for photosynthesis?
Water, carbon dioxide, and sunlight.
Name three organs, that food does not pass through?
liver， pancreas， salivary glands
What is the color of your blood if it's deoxygenated?
Blueish-red.
Which material in a cigarette causes cancer?
Tar.
How many chromosomes are in one gamete?
23
Does the upper epidermis and the lower epidermis do the same thing?
Yes
Is digestion a chemical change or a physical change?
Chemical change.
What are platelets?
Little fragments of cells that help mend wounds.
Name all the organs in the respiratory system.
Voicebox; windpipe; two bronchi; two lungs; air sacs; muscles between ribs; diaphragm.
How many weeks are needed for a baby to be born?
38 or 39 weeks (Usually)
What is the use of the waxy layer?
To prevent the leaf cells from drying out.
What are the uses of fat?
Provides energy and makes new cell membranes.
What is formed when oxygen is combined with haemoglobin, and what color is it?
Oxyhaemoglobin; bright red.
What exactly is aerobic respiration?
It is the release of energy from glucose by reacting it with oxygen inside living cells.
Where are egg cells and sperm cells made?
Ovaries and testes.