Q.1 Can increase grain production alone solve the problem of malnutrition and hunger?
And. No, increase grain production only for storage in Warehouse cannot solve the problem of malnutrition and hunger. Food security depends both on availability of food and access to it. As the majority of our population depends on agriculture for their livelihood, increase the income of people working in agriculture thus becames necessary to combat the problem of hunger.
Q.2 Define the term hybridisation and Photoperiod?
Ans. Hybridisation:- It refers to crossing between genetically dissimilar organisms.
Photoperiod:- The duration of sunlight available to the plant is called as Photoperiod. It affects the growth , flowering and maturation of crops.
Q.3 In agriculture practices, higher input gives higher yield. Discuss how?
Ans. Higher input means good financial condition of the farmers so that they can employ good and improved farming technologies. Thus these would give higher yields.
Q.4. What happen due to deficiency of nutrients ?
Ans. Nutrients are required by the plants for maintaining their health and every living process occurring in their bodies. Deficiency of nutrients affects the various physiological process in plant like reproduction, growth, susceptibility to diseases, etc and and can ultimately lead to the death of plant.
Q.5. How is culture of Pomphret and Mackeral different from that of catla and Rahu?
Ans. Pomphret and Mackeral are marine fishes cultured in sea water called mariculture. Whereas Catla and Rahu are freshwater fishes grown in land fisheries like ponds, canals, reservoirs and rivers called composite fish culture.
Q. 6 How is the use of manure beneficial for our environment?
Ans. Manure is beneficial because they help in : protecting the damage of environment from chemicals such as pesticides and fertilisers. Recycling the biological wast, i.e animal extcreta and plant wastes, thus preventing the accumulation of theses things.
Q.7. What is green manure ?
Ans. Some plants like sun hemp or guar are grown in the field prior to the sowing of crop sees. These are then mulched by ploughing them into the soil. These green plants gradually decompose and turn into green manure which help in enriching the soil in nitrogen and phosphorus.
Q.8. What do you understand by composite culture?
Ans. In composite fish culture system, combination of five to six fish is used in a single pond so that they do not compete for the food because of their different habits. For example, silver carp is a surface feeder which feed on the surface of pond, Rohu is a column feeder which feed on the middle portion of the pond and common Carp is a bottom feeder.
Q.9. What is honey ?
Ans. Honey is a sense sweet liquid that contains 20 to 40 per cent suger, 60-80% moisture, 0.22- 0.3 % minerals and 0.2- 0.5 % vitamins. Apart from that, it also contains certain enzymes and pollen.
Uses of honey are as follows:
a. Honey has medical value specially in disorders that are related to digestion and liver ailments.
b. As it contains iron and calcium, it also helps in the growth of the body.
c. It is used as a source of suger in various confectionery items.
Q.10. Name two types of animal feed and write their function.
Ans. The two types of animal feed are:
a. Roughage : -These are rich in fibre ; ie. Cowpea, berseem , etc.
b. Concentrates :- These are nutrient - rich and low on fibres; e.i, oats , maize, etc.
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