Study Materials

NCERT Solutions for Class 8th Science


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Chapter 1. Crop Production And Management

Additional Questions With Solutions




Additional Questions With Solutions

Ques: Define irrigation.

Ans: The supply of water to crops at different intervals is called irrigation.

Ques: Write the advantages of Manure.

Ans: The advantages of Manure.

  1. It enhances the water holding capacity of the soil.
  2. it makes the soils porous due to which exchange of gases becomes easy.
  3. it improves the texture of the soil.
  4. It increases the number of friendly microbes.​

Ques: Write five sources of irrigation.

Ans: The sources of irrigation are – wells, tubewells, ponds, rivers and canals etc.

Ques: Write any four traditional methods of irrigation.

Ans: (i)  moat (ii)  chain pump  (iii)  Dhekli and (iv) Rahat

Ques:  Write the modern method of irrigation.

Ans:  (i)    Sprinkler System  (ii)   Drip system

Ques: Name the modern method of irrigation which is the best technique for watering fruits plants, gardens and trees.

Ans: Drip system.

Ques: What are weeds?

Ans: Many other undesirable plants may grow naturally along with the crops. These undesirable plants are called weeds.

Ques: What is combine? Write its two benefits.

Ans: Combine is a machine which helps for harvesting and threshing.

Benefits of combine: 

(i) It completes work in a very few times

(ii) It saves money and labour.

Que: What is crop rotation?

Ans: Crop rotation is a process in which we sow the different crops in each different season.  Such manner of cropping is called crop rotation.

Que: how do weeds harmful for crops?


Write three disadvantages of weeds.

Ans: Disadvantages of weeds.

(i) It takes all nutrient, water and light from soil.

(ii) They affect the growth of the crop.

(iii) Weeds interfere even in harvesting and may be poisonous for animals and human beings.

Que: How can the deficient of certain nutrient be avoided in a field.

Ans: The deficient of certain nutrient can be avoided in a field using the following process.

(i) Crop rotation

(ii) Manuring the field

(iii) To leave the field uncultivated (fallow) in between two crops.


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