CBSE Class 8 Science Chapter 2 Microorganisms: Friend And Foe Long Answer Questions
Question 1. A trash can contains the following materials. Plastic straw, Aluminium foil, Tissue paper, Glass bottles, Chicken bones.
1. Select the materials from the list that can be decomposed by microbes.
” Cbse Class 8 Science Long Answer Questions “
Answer: Tissue paper, Chicken bones.
2. Rohit is suffering from a stomach ache and is passing watery stools. What should Rohit do to prevent the spread of infection to other family members?
- He should eat properly cooked food
- He should wear a mask all the time
- He should maintain a distance from other family members
- He should wash his hands with soap after using the bathroom
” Cbse Class 8 Science Chapter 2 Laqs “
Read And Learn More CBSE Class 8 Science Long Answer Questions
Answer: 4. He should wash his hands with soap after using the bathroom.
” Microorganisms Friend And Foe Class 8 “
Microorganisms: Friend And Foe Class 8 Science Laqs With Answers
Question 2. Suman wants to see how quickly carrots lose colour. Loss of colour shows rotting of the carrot. She observes carrot slices on a plate under three different conditions, as shown below
” Decomposition By Microorganisms “
She notes how long the carrot slices on each plate take to change colour
- What can Suman conclude from her activity?
- Carrots, when kept under the Sun, do not rot easily.
- Carrots at room temperature lose colour more quickly.
- Carrots can be best preserved in hot and moist conditions.
- Carrots take more time to lose colour under cold conditions.
Answer:
- Carrots take more time to lose colour under cold conditions.
- Use the results of the activity to finish the graph below. The first bar is drawn for you. Put a label in the space provided for the axis on the left.
” Nitrogen Cycle Class 8 “
Answer:
” Preventive Measures For Diseases “
Question 3. The picture shows the nitrogen cycle
” Causative Microorganisms Of Diseases “
1. How do plants take up nitrogen?
Answer: Plants take up nitrogen from the nitrogenous compounds in the soil.
2. Plants and animals are continuously using nitrogen. Will there be a depletion of nitrogen in the environment due to this continuous use? Explain your answer.
Answer: No, nitrogen in the environment will not get depleted because it is recycled and reused in the environment.
” Mode Of Transmission Of Diseases “
Question 3. Give the causative microorganism, mode of transmission, and one preventive measure of human diseases like Polio, Cholera, and Hepatitis B.
Answer:
