P S Verma and V K Agarwal solutions for Biology [English] Class 9 chapter 1 - Improvements In Food Resources [Latest edition]

Distinguish between micronutrients and macronutrients. Give suitable examples.

Classify nutrients according to their sources.

How plants get nutrients ?

Name three most important nutrients required for plant growth.

Choose plant’s micronutrients and macronutrients from the following Iron, Chlorine, Sulphur, Copper, Nitrogen, Calcium, Manganese, Potassium, Zinc, Magnesium, Molybdenum, Phosphorus.

 What are 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 rain water 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 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 suitable examples for 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 ?

How does excessive irrigation lead to soil salinity ?

Mention three effects of excessive irrigation.

Why water should be used judiciously ?

Explain advantages of irrigation.

Explain, how efficiency of irrigation can be increased.

Explain the various factors which are responsible for the loss of stored food grains.

Explain the various preventive measures which are taken before storing the food grains.

Describe how drying of food grains is done.

Write down three unique characteristics of storage structure.

Describe the various methods of controlling pests attacking stored grains.

As an incharge of a grain store, how will you find out the presence of pests ?

How does fumigation differ from spraying ?

'Milk is a very nutritious food'. Use the table given in the book to justify statement.

Name four animals which provide us food.

Write down the names of animal products which are used as food.

How does roughage differ from concentrates with reference to cattle feed ?

Give an example of average daily feed of a cow.

What are the sources of "concentrates" given in a cattle feed?

Write down four main characteristics of good cattle shelter.

Which method will you suggest for improving the cattle breed and why?

Write short notes on:

(a) General utility breeds of cow

(b) Breeds of buffalo.

Mention four steps involved in artificial insemination.

Define artificial insemination. Write down two advantages of it.

Write down four symptoms of sick animals.

Write the characteristic symptoms of :

(a) Mastitis

(b) Foot-and-mouth-disease

How are high yielding breeds of poultry advantageous over indigenous breeds?

Mention four advantages of fishery.

Write a short note on 'Prevention of poultry diseases'?

Write advantages of bee keeping.

What are the advantages of composite fish culture?

Write notes on plants and animals as sources of food.

How would you define Green Revolution?

What are the common objectives of crop improvement?

What we do get from cereals, pulses, fruits and vegetables?

Explain the objectives of mixed cropping. 

How are crops selected for mixed cropping?

Distinguish between mixed cropping and intercropping.

Explain the advantages and disadvantages of mixed cropping.

Define intercropping. How does it differ with mixed cropping?

Write down disadvantages of crop rotation.

Write about three main criteria which should be considered while selecting the crops for rotation?

Why are leguminous crops desirable in crop rotation?

Explain various steps in hybridization of crop plants.

Define plant breeding? Describe the various methods of plant breeding.

Describe the biological method of weed control.

Classify plant diseases depending upon their occurrence and transmission.

Mention three different ways in which insect pests can attack the crop plant.

Explain the methods of controlling insect pests.

Give two examples each of

(a) Narrow leaved rabi season weed.

(b) Broad leaved kharif season weed.

Explain various methods of weed control.

Explain various effects of weeds on crop plants.

What are crop's pests? Suggest preventive measures to control pests.

What is the advantage of using insect resistant varieties?

Distinguish between fertilizer and manure. Give suitable examples. What are advantages and disadvantages of using fertilizer?

Explain the mechanism of compost formation.

Explain what will happen if in a cultivated field only manures are supplied and in another field only fertilizers are supplied, keeping all other conditions similar.

Define irrigation. Why is irrigation of crops essential? Mention the harmful effects of excessive irrigation.

Explain various types of irrigation systems in India. How can efficiency of applied water be increased in agriculture.

Compare between mixed cropping and intercropping. Write down from advantage of both of these techniques.

Explain the various methods of crop improvement. Name one improved variety of Rice, Maize, Soyabean, Sunflower and Mustard.

Discuss the various methods which are used to control plant diseases.

Explain the various preventive measures against insect pests.

What is feed? What are different type of feed? How is it differ with respect to age and functions?

What is artificial insemination? Describe this technique.

Write a short note on prevention of animal diseases.

How bee colony works? What values can be seen in the organisation of bee colony?

Write down the desirable characters of bee variety suitable for bee keeping.

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

For increasing production, what is common in poultry, fisheries and bee-keeping?

How do you differentiate between capture fisheries, inland fisheries and aquaculture?

Explain the role of workers in a bee colony.