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1,381 answers across CBSE, ICSE, and State boards — Class 1 to 12, every subject.

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ScienceClass 8ICSE

What is ploughing (or tilling)? Name any two implements used for tilling the fields.

Answer The process of loosening and turning the soil is called ploughing (tilling). Before sowing the seeds, it is necessary to loosen and turn the soil in the fields as to break it to the size of the grains which is done with the help of three main implements or tools to plough are hoe and cultivator.

ScienceClass 8ICSE

Explain why, the seeds should be sown at the right spacings.

Answer The seeds should be sown at appropriate depth because seeds sown superficially can be eaten by the birds. But they should not be sown too deep also. In addition to this, the seeds should not be sown too close as the plants will not get sufficient space to grow and will compete for space, nutrients and sunlight.

ScienceClass 8ICSE

What are the advantages of sowing seeds with a seed drill?

Answer A seed drill is composed of a funnel which has a long and pointed neck. The seed drill is attached to the plough-shaft. When seeds are kept in the funnel they drop gradually through the neck; when the field is being ploughed. Advantages of sowing seeds with a drill: The seeds are sown at exact depth and interval Seeds get covered by soil Seeds are sown at regular rows and columns It saves time and labor

ScienceClass 8ICSE

Why do farmers carry out the leveling of the ploughed fields?

Answer The levelling of ploughed fields prevents the top fertile soil from being carried away by strong winds or washed away by rain water. The levelling of ploughed fields helps in the uniform distribution of water in the fields during irrigation. The levelling of ploughed fields helps in preventing the loss of moisture.

ScienceClass 8ICSE

Name the various agricultural practices in the right sequence in which they are undertaken by the farmers.

Answer The various agricultural practices which they are undertaken by the farmers are: Preparation of soil Sowing Adding manure and fertilizers Irrigation Protecting from weeds Harvesting Storage

ScienceClass 8ICSE

What are the two types of crops based on seasons? Give one e ample of each type.

Answer The crops are of the following types depending upon the season in which they are grown: Kharif Crops The crops which are grown in the monsoon season in the month of June-September are known as Kharif crops. For eg., maize, millet, and cotton. Such crops require a lot of water and hot weather for proper Rabi Crops The crops that are grown in the winter season and harvested in the spring, e., from the month of October to March are called Rabi crops. Wheat, gram, and mustard are some of the Rabi Such crops require a warm climate for the germination and maturation of

ScienceClass 8ICSE

What is a crop? Give two examples of crops.

Answer Crops are plants grown by the farmers. Agriculture is the backbone of our country. It is the major occupation in the rural areas. The cultivation of crops depends primarily on the weather and soil conditions. Example: Maize and paddy.

ScienceClass 8ICSE

Which of the following are Kharif crops and which are rabi crops? Wheat, Paddy, Gram, Maize, Mustard, Cotton, Soyabean, Linseed, Peas, Groundnut

Answer Kharif crops: Paddy, Maize, Cotton, Soyabean, and Groundnut. Rabi crops: Wheat, Gram, Mustard, Cotton, Linseed, and Peas.

ScienceClass 8ICSE

How are weeds removed from the crop fields? Name one implement used for weeding.

Answer Weeds are removed from the crop fields by the following means: By Walking the field and pulling out the weeds. By mechanical means: Using trowel through the field that will fill up the space between the crop rows and cut/kill the weeds. By chemical Using a herbicide to kill the weeds. One implement used for weeding is trowel.

ScienceClass 8ICSE

Explain why, the frequency of irrigation of crops is higher in the summer season.

Answer In summer, the frequency of irrigation of crop increases as the rate of evaporation from the soil and leaves becomes higher. The time and frequency of irrigation diversify from season to season, crop to crop, and soil to soil. As a result, the frequency of irrigation increases in the summer season and decreases in the winter season.

ScienceClass 8ICSE

How do the irrigation requirements of a wheat crop differ from that of a paddy crop?

Answer The irrigation requirements of a wheat crop differ from that of a paddy crop because wheat is a Rabi crop whereas paddy is a Kharif crop. Wheat requires a moderate amount of irrigation whereas paddy requires plenty of irrigation. The Kharif crops are those which are sown in the rainy season. The rabi crops are grown in the winter season. The paddy is the Kharif crop but the wheat is the rabi crop. Therefore, wheat requires more water for irrigation.

ScienceClass 8ICSE

Explain the drip system of irrigation. State two advantages of the drip system of irrigation.

Answer Drip irrigation is a type of micro-irrigation soil has the potential to save water and nutrients by allowing water to drip slowly to the roots of plants, either from above the soil surface or buried below the surface. Drip irrigation systems distribute water through a network of valves, pipes, tubing, and emitters. Advantages of drip irrigation: High availability of water and nutrients Doses of water and nutrients tailored to the plant’s development needs No saturation and good soil aeration Avoids high salinity caused by excessive fertilizer application No wetting of foliage that can result in fungal diseases

ScienceClass 8ICSE

Explain how, the irrigation requirements of a crop depend on the nature of the soil in which the crop is grown.

Answer The irrigation conditions of a crop depend on the nature of the soil in which the crop is grown for the following reasons: If the water-retaining capacity of the soil is higher then there is no requirement for irrigating the soil many times as the soil possesses the capacity of holding water for a long time.

ScienceClass 8ICSE

Explain how, the irrigation requirements depend on the nature of the crop.

nswer The irrigation requirement depends on the nature of the crop because some of the crops need a lot of water and some of the crops need a very small amount of water. For example Paddy crop needs a lot of water whereas crops like wheat, gram and cotton, etc., do not require so much water.

ScienceClass 8ICSE

a)What are weeds? Name any one weed found in a crop field. (b)How do weeds affect the growth of crops?

Answer The unwanted plants which grow in the fields are called Oat is the weed found in the crop field. Weeds try to absorb all the water, nutrients, light being given to crop and damage

ScienceClass 8ICSE

(a)Out of drip system and sprinkler system of irrigation, which one is more suitable : (a) for uneven land? (b) for sandy soil? (c) for watering fruit plants? where availability of water is poor?

Answer Sprinkler system Sprinkler system Drip irrigation Drip irrigation

ScienceClass 8ICSE

1. a) Why is it is necessary to dry the harvested food grains before storage? (b) What are the two ways in which farmers store food grains?

1. (Answer It is necessary to dry the harvested food grains before storage because the grains contain the moisture The moisture content in the grains promotes the growth of fungus and moulds in the grains. The two ways in which farmers store food grains are in jute bags and in metal bins at

ScienceClass 8ICSE

Fill in the following blanks (a) The same kind of plants grown and cultivated on a large scale at a place is called (b) The first step before growing crops is of soil. (c) For growing a crop, sufficient sunlight, , and from the soil are essential. (d) Damaged seeds would on top of water. (e) Crop rotation helps in the replenishment of soil with (f) The supply of water to crops at different intervals is called (g) The unwanted plants present in a crop field are called (h) Dried leaves are used for storing food grains at home. (i) Many people living in the areas consume fish as a major part of their diet.

Answer The same kind of plants grown and cultivated on a large scale at a place is called crop The first step before growing crops is the preparation of For growing a crop, sufficient sunlight, nutrients, and water from the soil are Damaged seeds would float on top of Crop rotation helps in the replenishment of soil with The supply of water to crops at different intervals is called The unwanted plants present in a crop field are called weeds. Dried neem leaves are used for storing food grains at Many people living in the coastal areas consume fish as a major part of their

ScienceClass 8ICSE

Name two methods of irrigation with conserve water.

Answer Two methods of irrigation with conserving water are drip irrigation and sprinkler system.

ScienceClass 8ICSE

Name the two types of substances which are added to two fields by the farmers to maintain the fertility of the soil.

Answer The two types of substances which are added two the fields by the farmers to maintain the fertility of soil are manure and fertilizer.

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