Viruses and prokaryotes
Answers are for parents and teachers.
1
Write 3–4 sentences on the importance of vaccination against influenza or rubella.
Vaccination creates immunity to the virus and prevents severe illness and spread.
2
Are viruses alive? Give arguments for both views.
Alive: they have genetic material, reproduce and evolve. Not alive: no cells and no metabolism of their own, inactive outside a cell.
3
Write the useful and harmful roles of bacteria in a table with 3 examples each.
Useful: yoghurt, silage, nitrogen fixation. Harmful: tuberculosis, cholera, food spoilage.
4
Why do clean drinking water and hand washing protect against infectious diseases?
They reduce the entry of disease-causing bacteria and viruses into the body.
5
Name two prokaryotes and write their importance.
For example, nodule bacteria accumulate nitrogen; Nostoc enriches soil with nitrogen.