(i) It has medicinal value, specially in disorders related to digestion, dysentery, vomitting, stomach and liver ailments.
(ii) It helps in growth of our body as it contains iron and calcium
(iii) It is used as a source of sugar in confectionery items and ayurvedic medicines.

The extraction of hormones from the pituitary glands of donor fishes and injecting the same to carps in cravity.
Advantages:
(i) Carps breed in rivers and not in captivity.By hypophysation carps can be made to breed in captivity.
(ii) We get healthy and pure seeds for fish farming.
(iii) This ensured supply of pure seeds for fish farming.

(i) True finned fishes. mullets, bhetki, pearl spots.
(ii) Shellfishes. mussels, oysters and prawns.

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

It means that India 5^th largest country in poultry farming, mainly fowl can be raised on low fibre foodstuff which is unfit for human consumption. Poultry provide both egg and meat (broiler) which are rich source of proteins. Chicken and eggs are choiced poultry products of large section of non-vegetarian population.

(i) Jersey and
(ii) Brown Swiss

(i) Red Sindhi cows are medium sized and red in colour with dark and light red shades.
(ii) Sahiwal breed is large and with heavier built. It is superior to other dairy cows.
(iii) Gir cows are native breed of Gir Forest in Gujarat. They are medium sized and fairly good milk yielders.

Animal husbandry is the scientific management of animal livestock. It includes feeding, breeding and diseases control of livestock.
Advantages of Animal Husbandry
The study of animal husbandry is essential to get the desired results in the following areas:
(i) milk production, egg production, etc.
(ii) proper utilisation of animal waste.

Weeds are unwanted plants that grow in the cultivated field.
Harmful Effects:
(i) Weeds compete for food, space and light with main crop plants.
(ii) Weeds germinate and grow faster, and they flower and mature early that the cultivated crop. Thus weeds take up all the nutrients from soil. The main crop will be weak and yield will be mush less.
Thus, removal of weeds from cultivated fields during the early stages of crop growth is essential to get high yield.

Weeds are unwanted plants that grow in the cultivated field.
Harmful Effects:
(i) Weeds compete for food, space and light with main crop plants.
(ii) Weeds germinate and grow faster, and they flower and mature early that the cultivated crop. Thus weeds take up all the nutrients from soil. The main crop will be weak and yield will be mush less.
Thus, removal of weeds from cultivated fields during the early stages of crop growth is essential to get high yield.

(i) Crop Production Management
(ii) Crop improvement for higher yield through genetic mainpulation.
(iii) Crop Protection Management.

Desirable agronomic characteristics in crop plants help give higher yield (i.e., higher productivity). It varies from crop to crop. For example, desirable characters for fodder crops are tallness and profuse branching, For cereal crops dwarfness is desired character so that lessnutrients are consumed by these crops.

Hybridization refers to crossing between genetically dissimilar plants.
Types of Hybridisation:
(i) intervarietal, i.e., crossing between different varieties.
(ii) interspecific, i.e., crossing between two different species of the same genus.
(iii) intergeneric, i.e., crossing between different genera.

Cereals - Carbohydrares
Pulses - Proteins
Fruits and Vegetables - Vitamins, minerals along with small quantities of protein, carbohydrates and oil also.

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