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What are macro-nutrients and why are the...

What are macro-nutrients and why are they called macro- nutrients ?

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Macro-nutrients are those nutrients which are required in large quantities for growth and development of plants. Since they are required in large quantities, they are known as macro-nutrient. The six macro-nutrients required by plants are nitrogen, phosphorus, potassium , calcium, magnesium , and sulphur.
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NCERT-IMPROVEMENT IN FOOD RESOURCES-Exercise
  1. How do biotic and abiotic factors affect crop production ?

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  2. What are the desirable agronomic characteristics for crop improvements...

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  3. What are macro-nutrients and why are they called macro- nutrients ?

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  4. How do plants get nutrients ?

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  5. Compare the use of manure and fertilizers in maintaining soil fertilit...

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  6. Which of the following conditions will give the most benefits? Why? ...

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  7. Why should preventive measures and biological control methods be prefe...

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  8. What factors may be responsible for losses of grains during storage?

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  9. Which method is commonly used for improving cattle breeds and why?

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  10. Discuss the implications of the following statement. ''It is interes...

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  11. What management practices are common in dairy and poultry farming?

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  12. What are the differences between broilers and layers and in their mana...

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  13. How are fish obtained?

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  14. What are the desirable characters of bee varieties suitable for honey ...

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  15. What are the advantages of composite fish culture?

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  16. What is pasturage and how is it related to honey production?

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  17. Explain any one method of crop production which ensures high yield.

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  18. Why are manure and fertilizers used in fields?

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  19. What are the advantages of inter-cropping and crop rotation?

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  20. What is genetic manipulation? How is it useful in agricultural practic...

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