CBSE Questions for Class 9 Biology Improvement In Food Resources Quiz 2 - MCQExams.com

• Milk production in cattle depends on the lactation period which means till the period/duration the female produces milk, food type it affects as what type of food she is eating and is nutritious milking time is in a day and also breed to which breed does it belongs, like a Jersey which is high milk yielding milk.

• Irrigation is the method by which water is collected, stored and supplied controllably when required by artificial means.
  
• All the given options like increase in salinization, groundwater depletion, etc., are not the outcome of irrigation projects. But sometimes reservoirs may result in floods due to loss of capacity in the reservoirs caused by sedimentation.
  

• Water resource management is the activity of planning, developing, distributing and managing the optimum use of water resources. 
• It is an aspect of water cycle management which includes proper knowledge of soil texture, modern methods of agriculture and irrigation systems.
• Hence, Option D- All of the above is correct.

• Mixed cropping is growing two or more crops simultaneously on the same piece of land, for example, wheat + gram, or wheat + mustard, or groundnut + sunflower. 
• This reduces risk and gives some insurance against failure of one of the crops.
• Thus, Option C is correct.

$$\textbf{Correct option: A}$$

$$\textbf{Solution:}$$

Option A:

$$\bullet$$ Check dams are the small and temporary dams constructed across a water body like a water drainage for the purpose to reduce soil erosion by preventing the eradication of soil along with waterflow. 

$$\bullet$$ These dams increase the levels of ground water because when the water is prevented to flow by making an barrier in its way, then that water gets enough time to leach into the soil below it. In this way, the groundwater level increases.

$$\bullet$$ When soil erosion is prevented, then the infiltration of water becomes more efficient.

Hence the correct option is option A.

• In poultry farming, poultry birds are raised, managed protected from diseases as they are used as food material for humans. 
• For egg and broiler production care is taken to avoid mortality and to maintain feathering and carcass quality. Poultry keepers should maintain proper cleaning, sanitation, and spraying of disinfectants at regular intervals of poultry house regularly. 
• It is necessary for them to be careful against diseases.

• Mixed farming is one in which crop production is combined with the rearing of livestock. 
• The livestock enterprises are complementary to crop production; so as to provide a balanced and productive system of farming. 
• In mixed farming, at least 10% of its gross income must be contributed by livestock activity. 

• Poultry fowl suffer from a number of diseases caused by viruses, bacteria, fungi, parasites, as well as from nutritional deficiencies. 
• These necessitate proper cleaning, shelter, special care for nutrition, sanitation, and spraying of disinfectants at regular intervals. 
• Appropriate vaccination can prevent the occurrence of infectious diseases and reduce the loss of poultry during an outbreak of disease.
• So, the correct answer is option D.

• Mixed farming is the process of growing crops and livestock animals in same areas of land. 
• In mixed farming manure is available from livestock animals maintains soil fertility. 
• Crop rotation is the method of cultivation in which different crops are cultivated on the same land in successive seasons. It helps to maintain the soil productivity. 
• Mono cropping is the pattern of cropping of a similar type of plant in the same land throughout the year. It reduces the biodiversity and increases the difficulty in nutrient cycling. 
• Thus, the correct answer is option B.