MEDIUM
Lower Secondary Stage 7
IMPORTANT
Earn 100

A baker added some yeast cells to water containing sugar. The number of yeast cells increased for 10 hours, and then stopped increasing.

 Which life process caused an increase in the number of cells? (Reproduction/Respiration)

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Important Questions on Microorganisms and Disease

MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 2 - Microorganisms and Disease>End of chapter review>Q 18

A baker added some yeast cells to water containing sugar. The number of yeast cells increased for 10 hours, and then stopped increasing. 

Suggest why the number of cells stopped increasing.

MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 2 - Microorganisms and Disease>End of chapter review>Q 19
 Some scientists do not think that viruses are organisms. Explain why not. 
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 2 - Microorganisms and Disease>End of chapter review>Q 20

Question Image 

Measure the yeast cell in the above figure and calculate its size in real life.