Being Alive Flashcards
What is the centre of a cell?
The nucleus.
What does the nucleus contain?
DNA. The information needed to create new life/reproduce.
What must all living things be able to do?
Move, respire, sense, grow, reproduce, excrete, feed.
What does the cell wall do?
It creates a strong sturdy and supports the cell. It is made of cellulose.
What does the cell membrane do?
This keeps the cell together and controls what goes in and out of the cell.
What does cytoplasm do?
This is a jelly-like substance. Most of the chemical reactions take place here.
What does the nucleus do?
It’s the control centre of the cell. It tells the cell what to do through genetic info.
What do the chloroplasts do?
These green discs allow the plant to make food from photosynthesis. They contain chlorophyll.
What is the word equation for aerobic respiration?
Glucose+oxygen > carbon dioxide+ water(+energy)
Why do cells adapt?
This way they can carry out different functions in a group of the same type of cells
Name an adapted cell and it’s job.
Nerve cells- have long axons so messages can be carried around the body quickly;
Cilated epithelial cells -line the tubes leading to the lungs. They have hairs or strands at the top which wave about to move dirt out of the lungs;
Muscle cells -are able to change length. This helps us move.
Root hair cells-have long ‘roots’ to make more surface and can take water out of the ground easily using the long root.
Palisade cells-these are packed with chloroplasts to absorb sunlight on t
Leaves and make food.
What is a tissue?
A group of cells working together.
What is an organ?
A group of DIFFERENT tissues working together.
Name an organ and specify what tissues it has.
Heart- muscle tissue and nervous tissue.
How do you figure out the total magnification of a microscope?
You multiply the magnification of the eyepiece lens to that of the objective lens.
E.g. OL = 40. EPL= 20
Total magnification = 800
What is a system?
A system is a group of organs working together.
What is an organism?
Many systems work together to make an organism.
Name the important organ systems.
Respiratory system-windpipe(trachea) and lungs. Takes air into the body.
Circulatory system- heart and blood vessels. Carries oxygen and food around the body.
Digestive system- mouth, gullet, stomach and intestines. Breaks down our food.
Nervous systems- brain, spinal cord and nerves. Carries messages around the body.
The urinary tract- kidneys and bladder
Flower- stamen and carpel. Used for sexual reproduction in flowers.
