Science Assignment

What is the purpose of irrigation in crop production? Explain briefly.

Paheli watched her grandmother making mango pickle. After she bottled the pickle, her grandmother poured oil on top of the pickle before closing the lid. Paheli wanted to know why oil was poured. Can you help her understand why?

While driving, what are the tips we must follow to save petrol/ diesel/natural gas?

Paddy is a major cereal crop in our country. (a) In which season is paddy cultivated? (b) Discuss the method of sowing. (c) What measures must be taken to prevent spoilage and insect attack of harvested grains?

Explain how fertilizers are different from manure.

Describe how coal is formed from dead vegetation. What is this process called?

Which microorganism is used in bread making?

• Bacteria

• Fungus

• Virus

• Yeast

What is the process of conversion of coal into petroleum called?

• Carbonation

• Hydrogenation

• Cracking

• Refining

What is the main aim of crop production and management?

• To produce maximum yield

• To improve crop quality

• To reduce crop diseases

• To increase crop water efficiency

Assertion (A): Crop rotation is a technique used to improve soil fertility. Reason (R): Crop rotation helps to break the life cycle of pests and diseases.

• Both A and R are true, and R is the correct explanation of A.

• Both A and R are true, but R is not the correct explanation of A.

• A is true, but R is false.

• A is false, but R is true.