Revision 1. Why do we need to chew our food and mix it with saliva? 2. Draw an animal and plant cell and label it. Challenge: can you state the job for each structure that you labelled. 3. Describe how a sperm cell is adapted to carry out its function. 4. State the function of the plasma, red blood cells, white cells and platelets 5. Describe the gas exchange in the alveoli. Draw a diagram to support your explanation. 6. Describe how tumours form. 7. What is the difference between a malignant tumour and a benign tumour? Answers 1. Why do we need to chew our food and mix it with saliva? • To soften the food and break it down. 2. Draw an animal and plant cell and label it. Challenge: can you state the job for each structure that you labelled. https://www.youtube.com/watch?v=9mvJ6GmMn1k Answers 3. Describe how a sperm cell is adapted to carry out its function. It has a tail to swim towards the egg. 4. State the function of the plasma, red blood cells, white cells and platelets Plasm transports food/nutrients. Red blood cells carry oxygen, white blood cells protects the body against infection, platelets clot the blood to stop bleeding. Answers 5. Describe the gas exchange in the alveoli. Draw a diagram to support your explanation. • The gases move by diffusion • oxygen diffuses into the blood • carbon dioxide diffuses from the blood to the air in the lungs Answers 6. Describe how tumours form. Uncontrolled cell division 7. What is the difference between a malignant tumour and a benign tumour? Benign tumours do not spread to other tissues while malignant tumours do.
