Crop production and management Short answer type questions

Question 1.
Name one pesticide you will use to kill insects that harm crops?
BHC (gammaxane)
Question 2.
Name three natural methods of adding nutrients to soil?
Field fallow, crop rotation and mixed cropping
Question 3.
Why should grains be dried before storage?
Grains have to be dried to prevent the growth of microorganisms before storage.
Question 4.
Why is it not advisable to sow rice in winter season in our country?
Because they need more water to grow.
Question 5.
If soil has all the nutrients, why do we need to replenish it?
when crops are grown in fields year after year, the soil becomes deficient in nutrients and less fertile. So, the soil has to be replenished with its lost nutrients from time to time.
Question 6.
Why is it important to sow seed at the correct depth and distance?
Seeds must be sown at the correct depth in the soil. If they are sown too deep, they may not grew due to the lack of air. And if they are sown too close to the surface, birds can eat them.

Question 7.
Why is the drip system of irrigation is excellent for areas like Rajasthan?
This method is excellent for regions with low water availability like Rajasthan and in this method there is no wastage of water.
Question 8.
What are silos?
Large scale storage of grains is done in silos to protect them from pests like rodents, microbes or insects.
Question 9.
Why does the government usually maintain a buffer stock of grains?
An extra stock called buffer stock is always maintained so that grains are available in plenty even if there is a shortfall in production in a particular year, foe example due to monsoon failure.
Question 10.
What do you mean by nitrogen fixation?
It is the process of converting free nitrogen gas of the atmosphere into nitrogen compounds.

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Class 8 Maths Class 8 Science
Reference Books for class 8 science

Given below are the links of some of the reference books for class 8 science.

  1. Oswaal NCERT & CBSE Pullout Worksheets Class 8 Science These worksheets can help student evaluate whatever he/she has studied from the text books.
  2. Science for Class 8 Paperback by Lakhmir Singh Detailed science book to clear basics and concepts. I would say it is a must have book for class 8 student.
  3. Pearson Foundation Series (IIT -JEE / NEET) Physics, Chemistry, Maths & Biology for Class 8 (Main Books) | PCMB Combo : These set of books could help your child if he aims to get extra knowledge of science and maths. These would be helpful if child wants to prepare for competitive exams like JEE/NEET. Only buy if you can provide help to the child while studying.
  4. Reasoning Olympiad Workbook - Class 8 :- Reasoning helps sharpen the mind of child. I would recommend students practicing reasoning even though they are not appearing for Olympiad.

You can use above books for extra knowledge and practicing different questions.

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