CBSE Chapter 1 Crop Management Short Answer Questions
Question 1. Classify the following crops into Kharif and Rabi crops and write in the tabular column given below. Maize, paddy, mustard, pea, gram, wheat, groundnut
” Agricultural Practices Flowchart Class 8 “
Answer: From the above given crop list, the Kharif and Rabi Crops can be grouped as
” Cbse Class 8 Science Chapter 1 Saqs “
Question 2. The levelling of a ploughed field is beneficial. Give reasons to support your
Answer: The levelling of a ploughed field is beneficial for the following reasons
- It helps in the uniform distribution of water in the fields during irrigation.
- It also prevents loss of moisture from the ploughed soil.
- It ensures ever germination and uniform growth of crops.
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Question 3. Beera wants to practice crop rotation in his field. Suggest a Rabi crop and a Kharif crop that will replenish his field with nitrogen. Which crop replenishes nitrogen and why?
Answer: Rabi crops are pea and grain, while Kharif crops are soybean. These are grown in different seasons and therefore can very well be rotated alternately. Pea and soybean are leguminous plants that harbour bacteria, i.e., Rhizobium, in their root nodules.
These bacteria convert atmospheric nitrogen into a usable form for plants. These nitrogen-fixing plants can replenish nitrogen in the field, and hence, Beera can easily practice crop rotation.
” Crop Management Short Answer Questions Class 8 “
Question 4. Leguminous plants do not require nitrogenous fertilisers. Why Is It so?
Answer: The planting of a leguminous crop in a field has the same effect as adding nitrogenous fertiliser in the field. They can fix atmospheric nitrogen themselves by using nitrogen-fixing bacteria in their root nodules. Therefore, nitrogenous fertilisers are not required for growing leguminous plants.
Question 5. State two advantages of using chemical fertilisers over manure. What would happen if fertilisers are used in excess?
Answer: Advantages of using chemical fertilisers over manure
Fertilisers are nutrient-specific and provide specific nutrients to the oil in the desired quantity.
These being readily soluble in water can he absorbed easily by the crop plants.
If it is used in excess, it causes tremendous changes in the chemical nature of the soil and makes it less fertile.
” Kharif And Rabi Crops Class 8 “
Question 6. Arrange the following boxes in proper order to make a flow chart of sugarcane crop production.
” Leguminous Plants And Nitrogen Fixation “
Answer: Flow chart for the crop production of sugarcane
” Chemical Fertilisers Vs Manure Class 8 “
Question 8. Explaining how to go to the continuous plantation of crops in the field.
Answer: Soil supplies mineral nutrients to the crop. These mineral nutrients are essential for the growth of plants. If crops are grown continuously in the same field for a long period, lie soil becomes poorer in nutrients. Titus, the soil gets deficient in nutrients, and the field becomes infertile.