Question

1. Fill in the blanks. (2 marks)

a) ______ are the undesired plants that grow along with crops in the field.

b) _______ are areas where plants, animals, and certain human communities are

protected and preserved.

2. Choose the correct option. (2 marks)

a) Which of the following is the causative microorganism of cholera?

(i) Virus (ii) Fungi

(iii) Bacteria (iv) Protozoa

b) Which of the following can help improve the fertility of soil?

(i) Irrigation (ii) Tilling

(iii) Harvesting (iv) Crop rotation

3. Answer the following questions in 30–40 words: (8 marks)

a) List the seven steps involved in crop production from start to end.

b) List and describe any two effects of deforestation.

c) Rishi bought wheat grains and directly planted them in tilled soil. However, most of

the seeds did not end up growing into healthy plants. Suggest two reasons why this

could have happened.

d) Someone in your family is suffering from a disease spread by a water-borne

pathogen. What precautions will you take to ensure that the disease does not spread

to others?

4. Answer the following questions in 60–80 words: (8 marks)

a) Draw a neat-labelled flowchart to explain the nitrogen cycle.

b) Explain how microorganisms are used in food production.


WHO WILL GIVE ME THIS ALL QUESTIONS ANSWER I WILL DO MARK AS BRANILIST​

Answer 1

Answer:

1 ) a . weeds

b. biosphere reserves

2) a . vibrio cholera ( bacteria )

b . crop rotation

:- long answers are very easy , please read ncert class 8 and enjoy your studies .