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What do you understand by composite fish culture? Describe in detail with advantages and disadvantages. What are the advantages of composite fish culture?
Which method is commonly used for improving cattle breeds and why?
What is mixed cropping? How does it help a farmer?
Name two desirable traits for variety improvement in poultry farming.
State the food requirements of dairy animals.
State two advantages of fertilizers over manure.
How do plants get their nutrients?
ORList the nutrients supplied by air, water, and soil.
Different crops require different climatic conditions, temperature and photoperiods for their growth and completion of their life cycle. Photoperiods are related to the duration of sunlight. Growth of plants and flowering are dependent on sunlight. As we all know, plants manufacture their food in sunlight by the process of photosynthesis. There are some crops, which are grown in rainy season, called the kharif season from the month of June to October, and some of the crops are grown in the winter season, called the Rabi season from November to April. Paddy, soyabean, pigeon pea, maize, cotton, green gram and black gram are kharif crops, whereas wheat, gram, peas, mustard, linseed are Rabi crops.
In India there has been a four times increase in the production of food grains from 1952 to 2010 with only 25% increase in the cultivable land area. This increase in production been achieved through the practices involved in farming, we can divide it into three stages. The first is the choice of seeds for planting. The second is the nurturing of the crop plants. The third is the protection of the growing and harvested crops from loss. Thus, the major groups of activities for improving crop yields can be classified as:
(i) What is kharif season period?
(a) June to July
(b) June to October
(c) June to November
(d) June to December
(ii) What is Rabi season period?
(a) November to April
(b) November to March
(c) November to February
(d) November to January
(iii) Plants manufacture their food in sunlight by the process called __________.
(a) Photosynthesis
(b) Photoperiod
(c) Photolysis
(d) None of the above
(iv) Enlist the names of Kharif crops.
(v) Enlist the names of Rabi crops.
Mention the modern initiatives undertaken in India to supply water to the fields.