CBSE > Class 08 > Science | CBSE Board | Homework Help

As the length of wire gets doubled, the cross-sectional area will become half of its previous value because volume of wire remains constant. Hence, we can see that the new resistance is four times the previous resistance.

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Un wanted plants grown along with crope

Posted by Ankit Gulia 3 years, 6 months ago

CBSE > Class 08 > Science

5 answers

Samriddhi Agarwal 3 years, 6 months ago

Weed are the unwanted plants that grow along the crops .. Which should be removed as it affects the growth of the plants..

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Jasmi Makker 3 years, 6 months ago

weeds thank u

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Ankit Gulia 3 years, 6 months ago

Large scale rearing of fish

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Swagat Mishra 3 years, 6 months ago

Weeds are the unwanted plants that grow along with crop..

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Shlok Katkar 3 years, 6 months ago

Weeds

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Keeping crop grain for a long time under proper conditions

Posted by Shreyansh Rai 3 years, 6 months ago

CBSE > Class 08 > Science

3 answers

Aspirant Aspirant 3 years, 6 months ago

Storage of crops.

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Roma Gujjar 3 years, 6 months ago

Storage

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Nikita And Pratik 3 years, 6 months ago

Is known as storage

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Define polymer. What is the need for making polymer

Posted by Op Rohit 3 years, 6 months ago

CBSE > Class 08 > Science

2 answers

Radhna Bhakti 3 years, 6 months ago

Polymer is a Greek word which means many parts/units. When monomers are joined together they are called polymer. We need polymer bcs it helps in making synthetic fibres

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Tarang Agarwal 3 years, 6 months ago

That's very easy

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What is mean by antibody

Posted by Sriya S 3 years, 6 months ago

CBSE > Class 08 > Science

2 answers

Harshita Dogra 3 years, 4 months ago

An antibody is a protein that develops in the body as a normal course of the immune response to various types of infections.

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Trisha Muttamshetty 3 years, 6 months ago

Antibody is known as Immunoglobulin

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How many bone in a animals

Posted by Satyam Shubham Mishra 3 years, 6 months ago

CBSE > Class 08 > Science

3 answers

Sia ? 3 years, 6 months ago

“They form the structure of the body.” Humans have 206 bones, while the average cat has about 244 bones. Sometimes, it's the number of bones and muscles that makes a difference in how an animal moves around. We cats, for example, have more bones in our spine than humans do.

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Harshita Dogra 3 years, 4 months ago

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Ankit Gulia 3 years, 6 months ago

244

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Define agriculture . List basic agricultural practices in correct order

Posted by Nupur Tayal 3 years, 6 months ago

CBSE > Class 08 > Science

3 answers

Jasmi Makker 3 years, 6 months ago

basic agricultural activities are 1. preparing the soil 2. sowing the seeds 3. inproving soil fertility 4. irrigation 5. crop protection 6. harvesting 7. storage

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Jasmi Makker 3 years, 6 months ago

The process or occupation concerned with cultivating land,breedig and rasing livestock is called agriculture

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Radhna Bhakti 3 years, 6 months ago

Agriculture is the art and science of cultivating the soil, growing crops and raising livestock. Different agricultural practices are:- 1.Preparation of soil 2. Sowing 3. Adding manure and fertilizers 4. Irrigation 5. Removing weeds 6. Harvesting 7. Storage

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Give different steps involved in agriculture.

Posted by Deepak Kumar 3 years, 6 months ago

CBSE > Class 08 > Science

2 answers

Radhna Bhakti 3 years, 6 months ago

Agricultural practices:- 1. Preparation of soil 2. Sowing 3. Adding manure and fertilizers 4. Irrigation 5. Protecting from weeds 6. Harvesting 7. Storage

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Nikita And Pratik 3 years, 6 months ago

Preparation of soil → sowing→adding manure and fertilizers→irrigation →protecting from weeds →harvesting →storage ..

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Out of the following material: Cotton, nylon,terylene,wool,PET, acrylic 1.wich materials are polyster 2.which material is a polymide 3.which material is used as a substitute for wool 4.which material is used as a substitute for glass

Posted by Mishti Gusain 3 years, 6 months ago

CBSE > Class 08 > Science

1 answers

Radhna Bhakti 3 years, 6 months ago

Polyester- nylon Polymide- terylene Wool- acrylic Glass- polyethylene teraphthalate( PET)

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Posted by Tseawang Lhamo 3 years, 6 months ago

CBSE > Class 08 > Science

2 answers

Shital Tambe 3 years, 6 months ago

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Arya Patil__ 3 years, 6 months ago

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Who discovered wooden furniture?

Posted by Shreya Student8C 25-10-2008 3 years, 6 months ago

CBSE > Class 08 > Science

4 answers

Anjali Yadav 3 years, 6 months ago

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Anjali Yadav 3 years, 6 months ago

Archaeologist

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Gargi Singh 3 years, 6 months ago

In Russia before 30,000 year ago

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Gargi Singh 3 years, 6 months ago

Archaeologist

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For discussion Despite being one of the growing economies, our country still has a large section of population going hungry and malnourished. Do you think an efficient crop production mechanism is the only solution to this? Discuss in the class what else needs to be done to root out hunger and malnutrition from our country.

Posted by Bongu Manogna 3 years, 6 months ago

CBSE > Class 08 > Science

1 answers

Sia ? 3 years, 6 months ago

Agriculture is the main source of income in India since a long time. Even for many decades, India was an agrarian economy. Apart from that India has a large number of agricultural consumers. Due to very high population it becomes necessary for a country like India that it maintains the agriculture sector and works for its benefits. The following methods can be useful for India to make it a vast agrarian country and to reduce malnutrition-

For breeding and seeding, we should select s high quality seed. These crops will have faster growth and higher yield.
The management and collection of the crops should be done very carefully. As, many a times, the crops which are being stored in the go-downs may get spoiled.
The crop should be made available to everyone. The government should not discriminate between the rich and poor.
The information regarding better production of the crops and its care should be made available on multiple platforms such as television and radio. It can help farmers to understand variety of crops and its farming.

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What is the full form of virus??

Posted by Khushnoor Rajpal 3 years, 6 months ago

CBSE > Class 08 > Science

5 answers

Anjali Yadav 3 years, 6 months ago

Virtual information resources under siege

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Mamta Sharma 3 years, 6 months ago

Vital Information Resources Under Siege is the full form of virus

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Gargi Singh 3 years, 6 months ago

Full form of virus —Vital Information Resources Under Siege

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Shreya Student8C 25-10-2008 3 years, 6 months ago

Vital information resources under seize

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Naresh Vashnav 3 years, 6 months ago

Covid-19

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Describe the role of nitrogen fixation in agriculture.

Posted by Madhu Singh 3 years, 7 months ago

CBSE > Class 08 > Science

2 answers

Nikita And Pratik 3 years, 6 months ago

Nitrogen is found in abundance in the atmosphere . It is one of the most important nutrient required for plant growth. The atmospheric nitrogen is converted into usable form of nitrogen compound by nitrogen fixation . If the same crops are grown in the field for many years , the soil becomes poor in nutrients like nitrogen and fertility of the soil decreases. The soil can be replenished with nutrients by growing such a crop which is able to fix up the nitrogen like leguminous crop. Rhizobium bacteria present in the root nocludes of leguminous crops fixes atmospheric nitrogen , converts it into usable compound , hence increasing the fertility of the soil .

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Mihir Raj 3 years, 6 months ago

Nitrogen fixation help help the plant to make Protein and his food.

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Explain how fertilizers are different from Menu

Posted by Ankush Kumar 3 years, 7 months ago

CBSE > Class 08 > Science

2 answers

Radhna Bhakti 3 years, 6 months ago

Fertilizers- They are inorganic salts. They are produced in factories. They are very rich in nitrogen, phosphorus and potassium. They cause water pollution. They don't provide any humus to soil. Manure- These are made by decomposing the dead remains of plants and animals. It is prepared in fields. It provides alot of humus to soil. They donot causa pollution. They are less nutrient rich.

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Nikita And Pratik 3 years, 6 months ago

The difference between manure and fertilizers Fertilizers It is an inorganic salt . It is made in factory . It provide particular nutrients to plants . It doesn't provide any humus to plant . It is very expensive. It pollutes the soil , water . Example : Ammonia, phosphorus, nitrogen, potassium etc. Manure It is organic substances made of decomposition of plant waste , animal waste. It is prepared in compost pits in the field. It improves the water holding capacity of soil . It improves the texture of soil . It provide lot of humus to plant . It is very cheap . It doesn't pollutes soil water etc .

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Write a short paragraph on the harmful effects of microorganisms.

Posted by Bhavika Soni 3 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Radhna Bhakti 3 years, 6 months ago

Microorganisms are harmful to us in many ways.  For example, microorganisms, called pathogens cause diseases in humans, plants and animals. Pathogens or germs enter a healthy body through air, water, contaminated food and infected person by direct or indirect contact or by the carrier and spread the diseases. Microorganisms that grow on our food sometimes produce toxic substances and make the food poisonous causing serious. Some Micro-organisms also spoil leather items and clothes.

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Define carbonisation

Posted by Riddhi Vinayak Pandey 3 years, 7 months ago

CBSE > Class 08 > Science

4 answers

Harshita Dogra 3 years, 4 months ago

Carbonisation :- The process of coversion of dead plants into coal.

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Khushnoor Rajpal 3 years, 6 months ago

The process of conversion of dead plants materials into coal due to heat and pressure which got burried deep under the earth's crust over a large period of time.....thank u...

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Rupam Das 3 years, 7 months ago

What are the major groups of microorganisms

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Riddhi Vinayak Pandey 3 years, 7 months ago

The process of conversion of dead plants materials into coal due to heat and pressure which got burried deep under the earth's crust over a large period of time.

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What Is Mass And What Is Weight

Posted by Saigopi Saigopi 3 years, 6 months ago

CBSE > Class 08 > Science

1 answers

Sia ? 3 years, 6 months ago

It is one of the fundamental quantities in Physics and the most basic property of matter. We can define mass as the measure of the amount of matter in a body. The SI unit of mass is Kilogram (kg).
It is the measure of the force of gravity acting on a body.
The formula for weight is given by:
w = mg

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hi solve 2000 + 3637737

Posted by Rudra Chetariya 3 years, 7 months ago

CBSE > Class 08 > Science

4 answers

Harshita Dogra 3 years, 4 months ago

36,39,737

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Shivansh Dev 3 years, 6 months ago

3639737

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Mamta Sharma 3 years, 6 months ago

3,639,737 is the ans

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Rudra Chetariya 3 years, 6 months ago

they win 1200 diamond in free fire

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Name of 1 chapter

Posted by Jaismeen Kaur Jaismeen Kaur 3 years, 7 months ago

CBSE > Class 08 > Science

5 answers

Mamta Sharma 3 years, 6 months ago

Crop production and Management

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Gargi Singh 3 years, 6 months ago

Crop production and Management

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Rachna Bhagat 3 years, 6 months ago

Crop Production And Management

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Twinkle Garg 3 years, 6 months ago

Synthetic fibres and plastics

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Tamanna Rajput 3 years, 7 months ago

Crop Production And Management

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What is the meaning of horticulture

Posted by Nibedeta Das 3 years, 7 months ago

CBSE > Class 08 > Science

2 answers

Gargi Singh 3 years, 6 months ago

The study are practice of growing flowers are fruit and vegetable called horticulture

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Asha Mayanglangbam 3 years, 7 months ago

Horticulture is the science and art of the development, sustainable production, marketing and use of high value, intensively cultivated food and ornamental plants

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full Summary of crop production and management

Posted by Viraj Jain 3 years, 7 months ago

CBSE > Class 08 > Science

4 answers

Radhna Bhakti 3 years, 6 months ago

As we know that this chapter is related to crops and there management so first thing is that what is a crop? When a plant of the same kind is grown on a large scale it is said to be a crop. So,till 10000bc people were nomadic. They wander here and there in search of food water and shelter. Slowly they started to grow crops and this lead to the discovery of agriculture. Now various practices are involved in agriculture. These are preparation of soil,sowing,adding manure and fertilizers, irrigation,removing weeds,harvesting and storage. So, the process of turning and loosening the soil is called PLOUGHING/TILLING. ploughing is helpful bcs it helps the plants to penetrate deep in the soil and to breathe easily. They also help in shuffling of friendly microbes and nutrients. Now the process of puting seeds in the soil is called sowing. There is a funnel like structure which was sued for sowing. I used here was bcs its a traditional method and isn't done nowadays. So in modern days sowing is done with a Seed drill. It helps to remove weeds and help in sowing. Seed drill helps to sow the seeds at an equal depth and distance and it also saves time and labour. So next the third step is adding manure and fertilizers. So first we need to know the difference between manure and fertilizers. Manure is an organic substance which is prepared by decomposition of dead remains of plants and animals. It is prepared in fields. It provides alot of humus to plants. It do not cause pollution. It is less nutrient rich. Whereas fertilizers are inorganic salts. The are produced in factories. They are very rich in NPK. They cause water pollution and donot provide any humus to plants. Next is irrigation. The supply of water to plants at regular intervals of time is called irrigation. The tradional irrigation systems are dhekli rahat moat and pulley. Modern system are sprinkler system- it has an arrangement of vertical pipes with a rotating nozzle. It is more useful in uneven areas where there is insufficient water. OTHER I WILL TELL YOU AFTERWARDS BCS IT IS MY MATHS CLASS TIME

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Nikita And Pratik 3 years, 6 months ago

Key Points Of Crop Production and Management The entire world depends on agriculture for its food. Therefore, it is very important to produce and store the harvested crops carefully. The soil should be loosened and aerated properly during crop production. Manures and fertilizers need to be added carefully. Too much fertilizer damages the soil while too little makes the crop deficient in nutrients. The crops should be irrigated periodically. The unwanted plants should be removed from the cultivated fields. These plants absorb the nutrients provided to the crop and obstruct their growth and development. The matured crops are harvested mechanically or manually. The harvested grains are dried and stored to protect them from pests and pathogens. To explore more concepts on Crop Production and Management, or any other related topics, please register at BYJU’S. Related Links Agriculture and Fertilizers Crop production Frequently Asked Questions What are the steps involved in crop production? The steps involved in crop production include: Ploughing Sowing Adding manures Irrigation Harvesting Storage What factors control crop production? The factors that control crop production include: Temperature Precipitation Solar radiation Wind velocity Soil moisture What is the importance of crop production? Crop production supports the huge population of a country. All individuals depend on the crops for their food. It also provides employment to a large number of people.

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Nikita And Pratik 3 years, 6 months ago

Agriculture is the science, which mainly deals with the diverse processes or the methods used for the cultivating different varieties of plants and livestock farming or animal husbandry on the basis of human requirements. When plants of the same variety are cultivated on a large scale, they are called crops. The crops are divided on the basis of the seasons in which they grow: Kharif Crops-These crops are sown in the early monsoon season, which generally varies by crop and region of cultivation. In India, Kharif crops are sown at the beginning of the rainy season, between the month of June and July. These crops are harvested at the end of monsoon season, between the month of September and October. Paddy is the main Kharif crop. Rabi Crops- These crops are sown during winter and after the monsoon, which is between the month of October and November. In India, Rabi crops are harvested during the spring between the month of March and April. Wheat is the main Rabi crop. Table of Contents: Methods Soil Preparation Sowing Manure And Fertilizers Irrigation Protection From Weeds Harvesting Storage Food From Animals Key Points Read on to explore the production and management of crops in detail. Crop production and management Crop Production and Management Methods About 70% of the Indian population practices agriculture. Hence, the production and management of crops is an important aspect to ensure optimal productivity in the fields. The major agricultural practices involved in crop production and management are listed below: Preparation of Soil Sowing of Seeds Addition of Manure and Fertilizers Irrigation Protection from Weeds Harvesting Storage Preparation of Soil The soil is loosened and tilted before the seeds are sown. Ploughs are used for the purpose. If the soil contains big lumps, they are broken with the help of a hoe. This process aerates the soil so that the roots breathe easily. The nutrients and minerals get properly mixed with the soil and come at the top. Thus, the fertility of the soil increases and is fit for plantation. Sowing of Seeds The good quality, infection-free seeds are collected and sown on the prepared land. The seeds should be sown at proper depths and proper distances. Following are the various methods used to sow the seeds: Traditional techniques Broadcasting Dibbling Drilling Seed dropping behind the plough Transplanting Hill dropping Check row planting Addition Of Manures And Fertilizers The soil may not have the right nutrients to efficiently sustain plant growth. Hence, manures and fertilizers are added to the soil to increase its fertility and help plants grow better. Manure is prepared by using decomposing plant and animal matter in compost pits. Fertilizers, on the other hand, are chemicals prepared in factories which contain nutrients for a specific plant. They give faster results than manures. However, when excessively used, they turn the soil infertile. Irrigation Crops require water at regular intervals for proper growth. The supply of water to the plants is known as irrigation. Well, rivers, lakes, tube-wells are different sources for irrigation. The traditional methods of agriculture involve the use of humans and animals. The various traditional ways are moats, chain-pump, dhekli, rahat. The modern techniques of irrigation include the sprinkler system and the drip system. Water is very important for the germination of seeds. It helps in the proper development of flowers, fruits, seeds, and plants. Therefore, it should be present in plants in large quantities. Protection from Weeds The undesirable plants that grow along with the crops are called weeds. These weeds, feed on the nutrients provided to the crops and thus reduce the supply of nutrients to the crops, thereby, inhibiting their growth. The growth of these weeds needs to be prevented in order to enhance the growth of the plants. The process of removal of weeds is called weeding. To achieve this, weedicides are employed, which are essentially chemicals specifically made to destroy weeds. They are usually sprayed before seeding and flowering. Harvesting When the crop matures, it is cut for further processing. This process is known as harvesting. It is usually manual labour, done with the help of sickle. However, mechanical harvesting is used these days – machines such as combine harvesters are used where the crops are harvested and threshed in one go. Threshing- Separation of grains from the harvested crops is called threshing. It is done either mechanically or by cattle. Winnowing- The separation of grains and chaff is called winnowing. It is done either mechanically or manually. Storage The grains should be properly stored if they are to be kept for longer periods. They need to be protected from pests and moisture. The freshly harvested seeds should be dried before they are stored. This prevents the attack from microorganisms and pests. The harvested and separated grains are stored in airtight metallic bins or in the jute bags. Dried neem leaves are added to protect them from damage at home. Large amounts of grains are stored in granaries or silos with specific chemical treatments, to protect them from pests and insects. Food From Animals Animals are an important source of food. The rearing of animals for food is known as animal husbandry. Some animals like cows and buffaloes are reared for milk, others for meat like goats and poultry. Some people consume fish as a part of their diet. Honey bees are reared for honey. Thus, animals are an integral source of food and food products.

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Jigyasa Korde 3 years, 7 months ago

In this chapter you will study about crops and the agricultural practices which are taken by farmers while growing a crop.

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What is the definition of crop

Posted by Tanushka Chahar 3 years, 7 months ago

CBSE > Class 08 > Science

5 answers

Radhna Bhakti 3 years, 6 months ago

When plants of the same kind are grown on a large scale,it is said to be a crop

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Nikita And Pratik 3 years, 6 months ago

When plants of the same kind grown on a large scale in the field is called a crop.

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Bhavika Soni 3 years, 7 months ago

When the plants of the same kind are grown in the same piece of land on a large scale is called a crop.

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Gargi Singh 3 years, 7 months ago

Answer ‐ When when plants of the same kinds are given and cultivated sun at one place on a large scale it is a place called a crop. For example‐Wheat ,Rice etc. There are two types of crops kharif crops and Rabi crops.

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Tamanna Rajput 3 years, 7 months ago

When plants of the same kind are grown and cultivated at one place on a large scale , it is called a crop .

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What is scientific name of plants?

Posted by Apoorva Jha 3 years, 7 months ago

CBSE > Class 08 > Science