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Solutions for Biology, Class 8, ICSE
Differentiate between food and cash crops.
Sl. No. | Food Crops | Cash Crops |
---|---|---|
1. | The crops that are grown to obtain food are called food crops. | The crops that are grown for their commercial value to earn profits are called cash crops. |
2. | All food crops are edible. | Not all cash crops can be eaten. Most of them are inedible. |
3. | Examples: Cereals, Pulses | Examples: Cotton, Sugarcane |
Which type of feed ensures good milk production in cattle?
The cattle feed of milk-yielding animals has two components — roughage and concentrates.
Name two diseases of cattle and poultry. How can animals be protected against diseases?
Two disease of cattle are:
Two disease of poultry are:
Animals can be protected against diseases by following ways:
What constitutes poultry feed?
The poultry feed consists of mashed cereals such as bajra, wheat, jowar, ragi and groundnut cake. Egg layers and Broilers are given different foods as per their need. Broilers require feed rich in proteins with adequate fat. The levels of vitamin A and K are kept high in poultry. Nutritive diet helps to maintain their immunity also.
How are bacteria useful to human beings?
The bacteria are useful to human beings in following way:
List five ways in which fungi help us.
Five ways in which fungi help us are:
What are cash crops? Name any two.
The crops that are grown for their commercial value to earn profits are called cash crops. For example, Cotton and Sugarcane
What is organic farming?
A form of agriculture that uses only organic inputs for supplying nutrients to soil and managing pests is called Organic farming
What is animal husbandry?
The branch of agricultural science that deals with the feeding, shelter, health and breeding of livestock is called animal husbandry.
Name any two indigenous breeds of cows.
Two indigenous breeds of cows are:
How are improved breeds of cows obtained?
Improved breeds of cow are obtained by mating the bulls of an exotic breed with the cows of a desi breed.
Among indigenous and exotic breeds of hen, which breed lays better eggs?
The exotic breeds of hen lay more and bigger eggs than indigenous breeds.
Name two products obtained from honeybees.
Two products obtained from honeybees are:
Give two examples of marine water fishes.
Salmon and Tuna are the two examples of marine water fishes.
The process of raising crops in the field for food and other useful products is called ............... .
The process of raising crops in the field for food and other useful products is called agriculture .
Rice, wheat and maize are ............... .
Rice, wheat and maize are cereals .
............... crops are grown for their commercial value to earn profits.
Cash crops are grown for their commercial value to earn profits.
............... produce contains no or very less levels of pesticide residues than conventional produce.
Organic produce contains no or very less levels of pesticide residues than conventional produce.
In India, the Green Revolution was led by ............... .
In India, the Green Revolution was led by Dr M. S. Swaminathan.
Name two leather-yielding animals.
Two leather-yielding animals are:
Name a breed of sheep in India.
Bikaneri is a breed of sheep in India.
Name two important breeds of goat in India.
Two important breeds of goat in India are:
Name an exotic breed of poultry.
White Leghorn is an exotic breed of poultry.
Murrah is a breed of which animal?
Murrah is a breed of Buffalo.
Agriculture
Agriculture — The process of raising crops in a field for food and other useful products is called agriculture.
Animal husbandry
Animal husbandry — The branch of agricultural science that deals with the feeding, shelter, health and breeding of livestock is called animal husbandry.
Apiculture
Apiculture — The breeding and management of honeybees for commercial purpose is called apiculture.
Sericulture
Sericulture — The breeding and management of silkworms for the production of silk is known as sericulture.
Cattle feed consists of two types of ingredients, ............... and ............... .
Cattle feed consists of two types of ingredients, roughage and concentrate.
............... is a common disease of cattle.
Anthrax is a common disease of cattle.
Pigs get easily infected with ............... which can be transferred to human beings.
Pigs get easily infected with tapeworm cyst which can be transferred to human beings.
............... is the rearing and large-scale production of fish.
Pisciculture is the rearing and large-scale production of fish.
The rearing of silkworm is known as ............... .
The rearing of silkworm is known as sericulture.
The process of treating animal skin to produce leather is called ............... .
The process of treating animal skin to produce leather is called tanning.
Sl. No. | Column A | Column B |
---|---|---|
1. | cow (hybrid) | Karan-Swiss |
2. | buffalo | Murrah |
3. | hen (desi breed) | Pashmina |
4. | hen (exotic breed) | White Leghorn |
5. | goat | Aseel |
Sl. No. | Column A | Column B |
---|---|---|
1. | cow (hybrid) | Karan-Swiss |
2. | buffalo | Murrah |
3. | hen (desi breed) | Aseel |
4. | hen (exotic breed) | White Leghorn |
5. | goat | Pashmina |
Saprophytic bacteria are called decomposers or nature's scavengers. Why?
Saprophytic bacteria are called decomposers or nature's scavengers because they decompose the dead remains of plants and animals and thus help to clean the environment. They decompose the complex compounds of the organic matter and release the nutrients in the soil. In this way, they help to maintain nutrient cycle in the nature.
How are animals beneficial to us in many ways?
We get a variety of products from animals. Animals are beneficial to us in following ways:
Why do you think organic farming is gaining popularity these days?
Organic farming is gaining popularity these days because people are becoming aware of its benefits which are as follows:
What will be the impact on the consumers of poultry products if hygiene is not maintained at poultry farms?
If hygiene is not maintained at poultry farms, it can lead to various diseases in birds. Some of these diseases may infect humans too. For example, Bird flu.
Which of these crops is not a cereal?
Pea
Reason — Pea is a pulse.
Which of the following is a cash crop?
Cotton
Reason — Cotton is grown for its commercial value.
In India, the Green Revolution was led by
Dr M. S. Swaminathan
Reason — In India, the Green Revolution was led by the scientist, Dr M. S. Swaminathan.
Poultry products are a rich source of
animal protein
Reason — Poultry products are a rich source of animal protein.
It is an example of exotic breeds of cows.
Jersey
Reason — Red Sindhi, Shahiwal, Gir are indigenous breeds of cows in India.
Aspergillosis is a disease occurring in birds caused by a
fungus
Reason — Aspergillosis is a fungal disease occurring in birds.
The place where bees are cultured and bred to get commercial products is called
apiary
Reason — Apiary is the place where bees are reared commercially.
The care, breeding and management of honeybees is called.
apiculture
Reason — The care, breeding and management of honeybees for commercial purposes is called apiculture.