Question

please answer these questions ​

Answer 1

Explanation:

1. 6) the the process by which crops are watered at intervals is known as irrigation. Sprinkle Irrigation and Drip Irrigation.
2. 8) soil gets affected by the constant plantation of crops in a field. Due to constant plantation, minerals and nutrients in the soil are absorbed by the crops and makes the soil barren.
3. 9) The unwanted plants that grows along with the main crops are called weeds. we can control the unwanted plants by removing them.
4. 5) Fertilizers are made with chemicals in the laboratories whereas, Manure is made through composting decay or dead bodies of plants and animals.

Answer 2

Ans.5) Manures are obtained from natural sources, whereas fertilisers are synthetically manufactured in the factories. Manures are eco-friendly, whereas fertilisers harm the useful microbes present in the soil and also decrease the soil fertility if used for a longer time.

Ans.6) The artificial method of watering the plants for assisting in their growth is called irrigation.

Main sources of irrigation are wells, tube-wells, ponds, lakes, rivers.

Two methods which help us to conserve water are:

1. Sprinkler irrigation system: this irrigation has an arrangement of vertical pipes with rotating nozzles on the top. It is more useful in the uneven and sandy land where sufficient water is not available.

2.Drip irrigation system: this irrigation system has an arrangement of pipes or tubes with very small holes in them to water plants drop by drop just at the base of the root. It is very efficient as water is not wasted at all.

Ans.7) If wheat is sown in the Kharif season (from June to October), then the whole crop might get destroyed because of many factors such as lack of optimum temperature, adaptability, availability of pests, etc. Kharif season includes the rainy season, which is not favourable for the growth of the wheat crop.

Ans.8) Continuous plantation of crops in a field makes the soil poor in certain nutrients such as nitrogen, phosphorus, potassium, etc. ... When a farmer continues to grow' crops one after the other, then all nutrients available in the soil reduce and the crop yield decreases automatically.

Ans.9)The undesirable and unwanted plants which grow naturally along with crops are called weeds. The growth of weeds can be controlled by adopting many ways. Tilling before sowing of crops helps in the uprooting and killing of weeds. Which may dry up and get mixed with soil. Weeds are also controlled by using certain chemicals, called weedicides. Weedicides are sprayed in the fields to kill the weeds.