Answer: Option A. -> Apis mellifera - Italian bee
:
A and C

Following are the scientific names for different varieties of honey bee:
  $\bullet$ Apis cerana indica -  Indian bee
  $\bullet$ Apis dorsata - Rock bee
  $\bullet$ Apis florae - Little bee
  $\bullet$ Apis mellifera - Italian bee
Out of all, the Italian bee is used widely for the commercial production of honey.

Answer: Option A. -> True
:
A

Catla and Rohu are examples of indigenous freshwater fishes. Freshwater fishes are those that spend some or all of their lives in fresh water, such as rivers, ponds and lakes.
In a pond, catla fish are surface feeders while rohu fish feed in the middle layers of the pond.

Answer: Option B. -> Only statement (ii) is incorrect
:
B
Food security depends upon both, the availability of food and access to it. Just over production does not guarantee food security. People should have money to buy food for themselves. 
Mixed farming involves the growth of multiple plants simultaneously on the same field. This increases the quality of soil, if the leguminous plants are grown along with crops. Fertilisers, like urea, are commercially produced plant nutrients. 

Answer: Option C. -> Macrobrachium rosenbergii
:
C

Fresh-water prawns are prawns grown in freshwater for human consumption. Among the given options, Macrobrachium rosenbergii is the only fresh-water prawn. Peneaus monodon is a marine prawn, common carp is a fresh-water fish and bombay duck is a marine fish.

Answer: Option A. -> micronutrients
:
A
The nutrients required by an organism can be broadly classified into two depending on the quantity required by the organism.
Macronutrients are required in large quantities while micronutrients are required in trace or very small amounts.
In plants, the macronutrients are nitrogen, phosphorus and potassium (NPK) while the micronutrients include boron, iron, manganese, etc. 

Answer: Option A. -> True
:
A
Crop variety improvement plays a very important role in order to improve crop yield.
This can be done by finding a crop variety that can give a good yield. The desired quality of this crop can be introduced into other crops by introducing its gene of desired quality, like high yield. These are genetically modified crops.

Answer: Option A. -> Insects
:
A

Storage losses in agriculture can be due to biotic and abiotic factors. Biotic factors which may cause crop storage losses are rodents (mice, rats), insects, fungi, bacteria, etc.
Some abiotic factors that result in storage losses are improper temperature, moisture conditions, etc.

Answer: Option A. -> Proper cleaning and maintenance of shelter facilities.
:
A, B, and C
For efficient and adequate maintenance of dairy animals, one must ensure proper cleaning and sanitation of the animal shelter facilities.
Animals should be provided with a balanced, hygienic and complete diet.
To prevent the mass wipe out of farm animals due to a fatal disease, it is very important to get the animals vaccinated regularly.

Answer: Option A. -> True
:
A

Many chemicals such as fertilisers, insecticides, pesticides, etc are used in agriculture to increase the quality and quantity of harvest. Excessive use of these chemicals creates problems since they can be poisonous to many plant and animal species and cause environmental pollution. 

Answer: Option B. -> Hybridisation
:
B

Crop variety can be improved by hybridisation which involves crossing between genetically dissimilar plants to produce plants with superior traits. Crops can also be improved by using genetic engineering in which a desired gene is introduced into a particular plant. This technique aims at specific and targeted changes in the plant.