Based on the water sources of fish production, they are of following two types:
(i) Marine (oceanic) fisheries
(ii) Inland fisheries i.e., fresh water fisheries

Pathogens are bacteria, fungi and virus which cause diseases in plants.
They are transmitted to plants through water, air, soil and seeds.
Examples of diseases:
(i) Rust in wheat
(ii) Blast in paddy/stem rot in pig/wilt in chick pea.on pea.

(i) Most agriculture in INDIA is rain-fed. The success of crops in most areas is dependent on timely monsoons and sufficient rainfall spread through most of the growing seasons. Untimely rainfall spoils the crop and crop yield.
(ii) Since weather conditions such as drought and flood situation are unpredictable, varieties that can be grown in diverse climatic conditions are useful.

Biotic factors such as diseases, insects and nematodes, and abiotic factors such as drought, sdalinity, water ligging, heat, cold and frost cause stresses on the crop plants. This result in decrease of crop production. Sometimes these stresses under different situations may cause destruction of the whole crop.

Maize - carbohydrate
green gram - proteins
ground nut - fats (fatty acids)
Niger - fats (fatty acids)

Pasturage: The flora/crops found around apiary to collect honey and pollen grains is called pasturage.
Pasturage flora honey bee include mango, coconut, almond, sisham, apple, tamarind, mahua, coriander etc.
Relation with honey production: The quality and the taste of honey depend upon the flora/pasturage around the apiary, from which bees collect the nuclear and pollens.For example, region of Kashmir having almond plant pasturage/flora around apiary produce almond honey that is good in quality, taste and smell.

These are:
(i) Catla fish is surface feeder.
(ii) Rohu fish feed in the middle zone of the pond i.e., they are column feeders.
(iii) Mrigal and common carp fishes feed on at the bottom of the pond.
(iv) Grass carps feed on aquatic weeds in the pond.

(i) Number and quality of chicks;
(ii) Dwarf broiler parent for commercial chick production;
(iii) Summer adaptation capacity/tolerance to high temperature;
(iv) Low maintenance requirements;
(v) Reduction in the size of the layer with ability to utilize more fibrous cheaper diets formulated using agricultural by-products.

Objectives of mixed cropping are to
(i) minimize risk and
(i) give insurance against failure of one of the crops.
Criteria for selection of the crops for mixed cropping are:
(i) Duration of Crops: Two crops growing together should have different durations for maturity. One should be of long duration and other should be of short duration.
(ii) Growth Habit: One crop should be tall growing and the other be short growing.
(iii) Root Pattern: One should be deep rooted where as other should be shallow rooted.
(iv) Water Need: One component crop should need lesser water than the other.
(v) Nutrient Demand: Component crops should have different nutrient requirements.

Fertilizers are commercially produced plant nutrients. They supply nitrogen, phosphorus and potassium. They are used to ensure good vegetative growth, giving rise to healthy plants.
The two examples of fertilizers are:
1. Urea
2. Superphosphate (NPK)
Different between Fertilizer and Manure:

The various factors responsible for grain loss during storage are:
(i) Biotic factors: Insects, Rodents (mice), Birds, Fungi, Bacteria, Mites, ect.
(ii) Abiotic factors: Inappropriate temperature, moisture, moisture contents of seeds, dampness of storage godown ect.
The above factors cause loss in weight, degradation in quality, discolouration of produce ect.
Measures for safe storage of grains: 
(i) Drying: Grains to be stored ideally should contain below 9% water content/moisture. When grains are harvested, usually contain 15 to 35% moisture. These freshly harvested grains are dried under the sun and then in shade to reduce the moisture content. Commercially grains are dried by mechanical driers with hot air blowing process.
(ii) Maintenance of hygiene: Grains should be kept in godowns that
(a) are very clean and do not have garbage, refuse, webs etc.
(b) do not have cracks, holes in walls, floor and ceilings.
(c) have clean and fresh gunny bags or are well treated with fumigate or dried under sun.
(d) have earthen pots, if to be used for storage, well cleaned and properly exposed to sun before use.
(iii) Prophylactic treatment: Godowns, gunny bags to be used for storage must be properly treated with fungicides, insecticides and other required pesticides by dusting, spraying or fumigation. Insecticides and fungicides should be mixed with grains that .are to be used for seed sowing.
(iv) Use of improved structures: Structures such as Pusa Bin, Pusa Cubicle, Pusa Kothar and Pant Kuthla can be used for storage purpose.
(v) Treatment of the surface area of the store house should be done by spraying mixture of BHC WP (50%), Pyrethrum (2.5 EC) and Malathion (50 EC) for controlling pests.
(vi) Fumigation of the store houses by chemicals such as aluminium phosphide tablets should be done.

Crop Rotation: The growing of different crops on the same field or a piece of land in a pre-planned succession is called crop rotation.
Selection of crops for crop rotation: Selection of crops depends on the -
(i) Moisture conditions i.e., availability water through rain or irrigation.
(ii) Length of rainy season.
(iii) Type of soil and nutrient status.
(iv) Availability of inputs-fertilisers, pesticides, manpower and machine power.
(v) Duration of crop-short or long.
(vi) Risk involved i.e., marketing and processing facilities.
For example, rabi crops of mustard, chickpea, linseed, barley, sunflower, and wheat are grown on conserved moisture.
In areas with assured soil moisture throughout the year, depending other inputs, rice, wheat, sugarcane, potato, and barseem are some of the major components of crop rotation.
Farmers near cities and towns prefer to grow vegetables and flowers for higher income.