answer the following questions Chapter1 5: Improvement in food resources
21.Give two advantages of apiculture.
22.Mention two advantages of using fertilizers over manure.
23. Answer the following.
a) What re concentrates in animal feed?
b) Name two internal parasites that cause disease in animals.
24.Explain intensive fish farming with help of one example.
25.Expalin the ways by which crop-production can be increased.
26.State three methods by which you can control growth of weeds in
agricultural fields.
27.Answer the following.
a) List six factors for which the variety improvements of crops is aimed at?
b) Explain two advantages of mixed cropping.
28.What are the macro and micronutrients?
29.What is animalhusbandry?
30. a) Name two common sources from which fish are captured.
b) Why are mussels and shell fish cultivated?
Answers
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Answer:
pollination,health, plant rich nutrients,insoluble in water
Explanation:
21. a.To be healthy keep honey at home
b.The Pollination occurs by means of bees
22. a.Fertilizers contains plant rich nutrients such phosphorus, potassium,Nitrogen.It is readily soluble in water
b.Manure contains small amount of plant nutrients and insoluble in water.
23 a.Concentrates are low fiber and high energy feed.The feed may raise the energy level for dairy cattle
b.Tapeworm and fluke worm
24. It is the composite fish culturing system.In this system different species of fishes grown together in a single pond.Moreover fishes are different food habit so that no fight for food among themselves example,catla are surface feeders whereas Rohu are middle-zone feeders,
25 There are three way through which crop production can be increased. They are
1. Crop production management : The farmers have consider about capital investment and in return get by selling the yields.
2.Crop protection management:The crops are protected by weeds, insects pests and disease,
3. Crop variety improvement: It can give good variety and high yield crop even under different climatic conditions
26 1. Walking the fields, and pulling out weeds by hands.
2, By mechanical means : pulling iron on field which till up the lands between rows
3.Using chemicals t or herbicides to control weeds
27a.. higher yield
2. Resistance to biotic and abiotic
3.Quality improvement
4. Change in maturity span
5.Adaptability
6 Agronomy desirable
b.1. Fertility of soil improved by growing two different crops at the same time
2. Risk of total crop failure due to uncertain monsoon is reduced.
28 Macronutrients are those nutrient the body required in large amounts such as carbohydrates,proteins and lipids .Micronutrient are those that the body needs in smaller amount such as minerals and vitamins that they play a significant role in the physiology of the body.
29 Animal husbandry means the branch of science which deals with the breeding,feeding and care of domestic animals.
30 a. Freshwater: it includes lakes,rivers,ponds etc
b. Mussles are used to cultivate freshwater pearls even it is good for the environment and human health.Shellfish is mainly cultured for its nutritional contents.