Pls give extra questions for science class8 ch1 ncert
Answers
Answer:
Chapter 1
Crop Production and Management Class 8 Extra Questions
Very Short Answer Questions
Question 1.
What is the name of the undesirable plants that grow among the crops?
Answer:
Weeds
Question 2.
Name one weed.
Answer:
Wild oat
Question 3.
Name the methods applied for weeding.
Answer:
- Manual method
- Chemical method
- Biological method
Question 4.
Name the chemicals that are used to remove weeds.
Answer:
Weedicides
Question 5.
Name a tool which is used for removing weeds and for loosening soil.
Answer:
Hoe
Question 6.
What is the process of loosening and turning of the soil called?
Answer:
Tilling or ploughing
Question 7.
What are the substances which are added to the soil in the form of nutrients called?
Answer:
Manure and fertilisers
Question 8.
What is the process of supplying water to crops at different intervals is called?
Answer:
Irrigation
Question 9.
What are the sources of irrigation?
Answer:
Wells, tubewells, ponds, lakes, etc.
Question 10.
What is the process of separation of grain from chaff called?
Answer:
Winnowing
Question 11.
Name two crops belonging to rabi crop.
Answer:
Pea, gram
Question 12.
Name the ideal months for the harvesting of rabi crops.
Answer:
March/April
Question 13.
Name two kharif crops.
Answer:
Soybean, groundnut
Question 14.
Name the ideal months for sowing kharif crops.
Answer:
June/July
Question 15.
Name any two fertilisers.
Answer:
NPK, Diammonium phosphate
Questions Short Answer Questions
Question 1.
What is a crop?
Answer:
Crop is the term used to describe a plant that is grown in a field on a large scale. For example, cereal crops, wheat crops.
Question 2.
What do you mean by produce?
Answer:
The products obtained from the crops are called produce.
Question 3.
What do you mean by the term agricultural practice?
Answer:
Agricultural practices are those practices which involve the necessary steps to be taken during production of crops.
Question 4.
Explain the term levelling.
Answer:
Levelling is the process of breaking down the larger lumps of soil, and then levelling them by using a leveller.
Question 5.
What are the advantages of levelling?
Answer:
Following are the advantages of levelling:
- Levelling helps to prevent soil erosion caused by wind or air.
- It helps in sowing the seeds uniformly, and thus helps the plants to grow uniformly too.
- It helps in proper irrigation by allowing the water to get distributed uniformly throughout the soil.
Question 6.
What is a plough?
Answer:
A plough is an equipment for ploughing. It is mainly made of a wooden shaft called a plough-shaft, at-tached to a triangular iron blade called ploughshare.
Question 7.
What is a cultivator?
Answer:
Cultivator is a farm implement used for stirring and pulverizing the soil for planting crops.