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100
What is the composition of air?
78% Nitrogen 21% oxygen 1% carbon dioxide, water vapour and other gases
100
Name all the parts in a human respiratory system.
Nose/mouth windpipe 2 lungs air tubes air sacs blood vessels
100
How do plants breathe?
They breathe through stomata.
100
Which animal group does a whale belong to? State the characteristics of that animal group.
It gives birth to young alive. It has lungs. It has hair/fur as body covering.
100
Describe how fishes breathe.
Water enters the mouth and flow over the gills. Oxygen is absorbed by the gills while carbon dioxide given out by the fish is removed.
200
When does photosynthesis and respiration take place?
Photosynthesis - When there is light. respiration - All the time
200
Where are stomata found?
On the leaves, mostly on the underside.
200
Explain the function of a stomata.
It allows carbon dioxide to enter and oxygen to leave during photosynthesis It allows oxygen to enter and carbon dioxide to leave during respiration.
200
What is the function of nose hair?
to trap dust in air we breathe in
200
Describe how a dolphin breathe.
Air enters the body through blowholes which are connected to the air tubes to the lungs.
300
What is the test for limewater?
In the presence of carbon dioxide, limewater turns chalky.
300
What is the difference between the air we breathe in (inhaled) and the air we breathe out (exhaled)?
Inhaled air contains more oxygen and less carbon dioxide.
300
How do insects breathe?
Through openings in their bodies called spiracles, which are connected to the windpipe and to the whole body of the insect.
300
What is the function of the heart?
It pumps blood to all parts of the body.
300
What are transported in the blood in our body?
food/nutrients water oxygen waste materials and carbon dioxide
400
What is blood made of?
Platelets white blood cell red blood cell plasma
400
What is the function of a red blood cell?
It carries oxygen and carbon dioxide.
400
What is the function of a white blood cell?
It helps to fight germs.
400
What is the function of a plasma?
It carries food, nutrients and waste materials.
400
What is the function of a platelet?
It thickens blood and make it clot for wounds to heal.
500
Name the 3 blood vessels.
artery veins capillaries
500
Is the blood flowing from the heart to the lungs rich or poor in oxygen? Why?
Poor in oxygen. Oxygen from the lungs has been used by other parts of the body.
500
Is the blood flowing from the lungs rich or poor in carbon dioxide? Why?
Poor in carbon dioxide. It is rich in oxygen as it has just absorb oxygen before transporting to other parts of the body.
500
What is the difference between water-carrying tubes and food-carrying tues in a plant?
A food-carrying tube carry food made in the leaves to other parts of the plant. A water-carrying tube carry water absorb from the roots to other parts of the plant.
500
In a cross-section of a stem of a plant, which tube in found in the inner part?
water-carrying tube