Lakhmir singh solutions biology class 9 Solutions for Chapter 1 improvements in food resources

Exercises in Chapter 1 improvements in food resources Grade 9

Exercise

Questions in Exercise

Distinguish between macronutrients and micronutrients. Give suitable examples.

Classify nutrients according to their sources.

How plants get nutrients?

Name the three most important nutrients required for plant growth.

Choose the micronutrients and macronutrients from the following:

Iron, Chlorine, Sulphur, Copper, Nitrogen, Calcium, Manganese, Potassium, Zinc, Magnesium, Molybdenum, Phosphorous.

What are the advantages of using manure?

Give two limitations of using manure.

Compare the use of manures and fertilizers in maintaining soil fertility.

Write down two advantages of fertilizer over manure.

During the downpour in a village, the rainwater carried away excess of nitrogenous and other compounds present in the soil to a pond. How will they affect the growth of algae and phytoplankton in the pond?

Explain the term eutrophication with suitable example.

How does the chemical nature of the soil change due to continued use of chemical fertilizers?

Explain various methods of fertilizer application.

Distinguish between farmyard manure and compost manure.

Define manure. What are different manures and how do they affect the soil?

What is green manuring? Give a suitable example of green manures.

What are fertilizers? Classify fertilizers.

Give a short account of biofertilizers.

Explain why a legume crop does not require nitrogenous fertilizers?

Why is irrigation essential?

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Chapters in this book

Improvements In Food Resources

The Fundamental Unit of Life - Cell

Tissues

Diversity in living organisms

Why Do We Fall ill