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

Sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs.

0Thank You

Anshalin Anto Anshalin 3 years, 10 months ago

What is a crop

1Thank You

ANSWER

What do you mean by sustainable development ?

Posted by Divyansh Jain 3 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Shreya Jha 3 years, 10 months ago

1) sustainable development is basically using resources carefully and saving them for the future generation or we can write 2) balancing and carefully utilising the resources to fulfill the present requirements and also conserving the resources for the future generations , so that our future population do not lack behind in the requirement of these basic needed resources . hope this helps !!

3Thank You

ANSWER

How reproduction done in female?

Posted by Md Allahrakha Ali 3 years, 10 months ago

CBSE > Class 08 > Science

3 answers

Rhea Sharma 3 years, 10 months ago

What is ******???

0Thank You

Shreya Jha 3 years, 10 months ago

Firstly the male's produced sperm enters the female body and tries to enter into the egg produced by the female reproductive parts , the egg is also called ova , when the sperms enters into the female body through ****** then these few sperms try to fuse with the egg (ova) . The unhealthy sperms dies and the healthy sperm gets fused with the egg .these sperms have 23 chromosomes in it , which carries the DNA ,which decides the sexual characteristics of the baby . sometimes not only 1 sperm gets fused with the egg instead 2 or 3 sperms fuse with the egg ,So twins or triplets are born in such cases . the fertilisation of egg and sperms take place in fallopian tube and then a single cell zygote is formed . then this cell keeps on dividing and after sometime a foetus is formed (developed baby structure ) inside the uterus of female and its comes out through ****** at the time of birth . hope this helps!!!!

1Thank You

Meghna Thapar 3 years, 10 months ago

The female reproductive system is designed to carry out several functions. It produces the female egg cells necessary for reproduction, called the ova or oocytes. The system is designed to transport the ova to the site of fertilization. During ***, sperm cells travel through the ****** to the uterus and fallopian tubes. In the fallopian tube, the sperm meets the egg that was released from the ovary during ovulation.

0Thank You

ANSWER

What is fraction

Posted by Rakesh Padhy 3 years, 10 months ago

CBSE > Class 08 > Science

5 answers

Bani Singh Bani Singh 3 years, 10 months ago

Friction is the force that opposes the motion of an object is called friction

0Thank You

@Kashish Sharma 3 years, 10 months ago

A part of whole

0Thank You

Shivansh Ojha 3 years, 10 months ago

A numerical quantity that is not a whole number

0Thank You

Karamtothu Nineesh 3 years, 10 months ago

A fraction represents a part of a whole or, more generally, any number of equal parts

0Thank You

Gaurav Seth 3 years, 10 months ago

A fraction is a word that is originated from Latin. In Latin, “Fractus” means “broken”. In real life, when we cut a piece of cake from the whole of it, say 1/4th of it, then the portion is the fraction of the cake.

Fractions are defined as the parts of a whole. The whole can be a number or any specific value or a thing. In other words, it is also termed as a portion or section of any quantity. It is denoted by using ‘/’ symbol, such as a/b. For example, in 2/4 is a fraction where the upper part denotes the numerator and lower part is the denominator.

0Thank You

ANSWER

How sound travel

Posted by Gaurav Machra 3 years, 10 months ago

CBSE > Class 08 > Science

5 answers

Gourav Majumdar 3 years, 10 months ago

When any object vibrates, then sound is produced through that object and that sound travels through any medium (solid, liquid or gas). Sound travels fastest in solid. The main thing is that sound travels through any medium or sound needs a medium to travel.

0Thank You

Himani Choudhary 3 years, 10 months ago

It needs a medium to travelb, it may be a solid liquid or gas.

0Thank You

Shreya Jha 3 years, 10 months ago

Sound waves need to travel through a medium such as a solid, liquid, or gas. The sound travels in form of waves through either of these medium that is solid, liquid or gas. it happens as the sound waves move through each of these mediums by vibrating the molecules in the matter or we can say that sound waves hits the particles of matter that is solid,liquid or gas and causes vibrations , thus it gets transferred from one place to another and sound travels fastest in solids as the solid matter particles are closest to each other as compared to liquid and gases.

1Thank You

Laxmi Chudhary 3 years, 10 months ago

Helo

3Thank You

Meghna Thapar 3 years, 10 months ago

Sound waves travel at 343 m/s through the air and faster through liquids and solids. The waves transfer energy from the source of the sound, e.g. a drum, to its surroundings. Your ear detects sound waves when vibrating air particles cause your ear drum to vibrate. Sound vibrations travel in a wave pattern, and we call these vibrations sound waves. Sound waves move by vibrating objects and these objects vibrate other surrounding objects, carrying the sound along. ... Sound can move through the air, water, or solids, as long as there are particles to bounce off of.

3Thank You

ANSWER

Which organlee generate around for the cell

Posted by Aayushi Dutt Sharma 3 years, 10 months ago

CBSE > Class 08 > Science

3 answers

Nitu Singh 3 years, 10 months ago

Mitochondria

0Thank You

Shreya Jha 3 years, 10 months ago

yes mitochondria is the correct answer.

0Thank You

Gaurav Seth 3 years, 10 months ago

mitochondrion

Mitochondria. The mitochondrion (plural, mitochondria) is an organelle that makes energy available to the cell (. This is why mitochondria are sometimes referred to as the power plants of the cell.

0Thank You

ANSWER

Say all non metals are bad conducters along with water and give reason

Posted by Kandula Mohan . Sai Pranav 3 years, 10 months ago

CBSE > Class 08 > Science

4 answers

Kandula Mohan . Sai Pranav 3 years, 10 months ago

Ok thanks

1Thank You

Shreya Jha 3 years, 10 months ago

graphite is a non metal but it is also a good conductor of heat and electricity .

2Thank You

Shreya Jha 3 years, 10 months ago

all non metals are bad conductors of heat is not a true statement, it is a false statement . one non metal that is a good conductor of heat is graphite . answer

2Thank You

Bhuvan .V 8C2020 3 years, 10 months ago

I think all non metal are bad conducter of electricity but not water

2Thank You

ANSWER

Breeding meaning

Posted by Koushik K 3 years, 10 months ago

CBSE > Class 08 > Science

5 answers

Kandula Mohan . Sai Pranav 3 years, 10 months ago

???????

0Thank You

Kandula Mohan . Sai Pranav 3 years, 10 months ago

Giving birth to a living beings

0Thank You

. . 3 years, 10 months ago

Breeding is sexual reproduction that produces offspring, usually animals or plants. ... Breeding may refer to Breeding in the wild, the natural process of reproduction in the animal kingdom. Animal husbandry, through selected specimens such as dogs, horses, and rabbits. Thankuuuu

1Thank You

Jayanthasena E.L 3 years, 10 months ago

Breeding is sexual reproduction that produces offspring, usually animals or plants. ... Breeding may refer to: Breeding in the wild, the natural process of reproduction in the animal kingdom. Animal husbandry, through selected specimens such as dogs, horses, and rabbits.

0Thank You

Shikha Yadav 3 years, 10 months ago

0Thank You

ANSWER

What is nitrogen cycle ?

Posted by Koushik K 3 years, 10 months ago

CBSE > Class 08 > Science

5 answers

Kawareer Abdal Beig 3 years, 10 months ago

The cyclic process of nitrogen fixed, and used by plants & animals & later returned to the atmosphere, is referred as nitrogen cycle.

0Thank You

Yogita Ingle 3 years, 10 months ago

Nitrogen cycle is all about the movement of nitrogen between various elements on Earth (like air, soil, living organisms etc.) The amount of nitrogen in the atmosphere remains constant.

Atmosphere has approx. 78% nitrogen.
Atmospheric Nitrogen is fixed into the soil
- N₂ fixing microbes convert atm. N₂ into nitrogen compounds like NH₃
Plants utilize nitrogen from soil through their roots
Animals utilize nitrogen, feeding on plants
When Plants & animals die, Nitrogenous wastes are returned to soil
- Decomposers convert some part to nitrogen compounds to be used by plants
- Denitrifying bacteria convert into atm. N₂

1Thank You

Saumya Kumar 3 years, 10 months ago

you can write which one you like and its your choice and pls hit the like button

0Thank You

Saumya Kumar 3 years, 10 months ago

The nitrogen cycle is the biological cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems. The conversion of nitrogen can be carried out through both biological and physical processes.

1Thank You

Saumya Kumar 3 years, 10 months ago

The processes by which nitrogen and it's compounds are interconverted in the enviornment and in living organisms , including nitorgen fixation and decomposition

1Thank You

ANSWER

How many naturally occurring elements are there

Posted by Ankush Kumar 3 years, 10 months ago

CBSE > Class 08 > Science

3 answers

Jayanthasena E.L 3 years, 10 months ago

Elements 1 through 92 (except for elements 43 and 61) occur naturally on Earth, although some are only present in extremely small quantities. The elements following uranium on the periodic table are only produced artificially, and are known as the transuranium or transuranic elements.

0Thank You

Ayush Sharma 3 years, 10 months ago

0Thank You

Yogita Ingle 3 years, 10 months ago

There are 92 naturally occurring elements. Each element has a unique set of properties that is different from the set of properties of any other element. For about 2000 years, people accepted Aristotle's idea that all matter is made up of just four elements: earth, air, water, and fire.

2Thank You

ANSWER

HOW DO FARMERS PREPARE SOIL FOR CULTIVATION?

Posted by Ms. Devil 3 years, 10 months ago

CBSE > Class 08 > Science

3 answers

Jayanthasena E.L 3 years, 10 months ago

In agriculture, ploughing, levelling, and manuring are the three steps of soil preparation. Ploughing includes loosening and digging of soil. During ploughing, the soil becomes loose and the nutrients in deep soil come to the top

0Thank You

Sachin Poonia 3 years, 10 months ago

2Thank You

Gaurav Seth 3 years, 10 months ago

It involves the following steps

Ploughing Soil
It means turning the soil and loosening it.

Levelling Soil
It is done so that top soil is not blown away by wind

Manuring Soil
Sometimes manures are added to increase fertility of soil

2Thank You

ANSWER

WRITE AN INVESTIGATIVE REPORT ON HOW FARMERS PREPARE SOIL FOR CULTIVATION?

Posted by Ms. Devil 3 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Shruti ? 3 years, 10 months ago

Ploughing - Ploughing includes loosening and digging of soil. During ploughing, the soil becomes loose and the nutrients in deep soil come to the top. Also, aeration of soil will increase thus air is available for breathing and roots are easily penetrated between soil. Other purposes of ploughing are the integration of manure, uprooting of weeds, removal of infectious pathogens, insects etc. Ploughs of wood or iron are used for this purpose. Bullocks or tractors are used to pull this plough. Hoe is another tool used to uproot weeds and to loose soil. Levelling - Levelling helps in even distribution and soil is levelled after ploughing. A plank of wood or iron is used for this. Levelling also helps in water distribution without logging during irrigation. Manuring - After ploughing and levelling, manure is applied to further stages of farming. Manuring is done to replenish the soil with nutrients and thus helps in proper growth of the crop. Soil preparation gives agriculture field which is fertile containing ideal soil and makes it ready for farming. Manuring and removal of weeds at a regular interval and frequency help farmers to yield a better product.

2Thank You

ANSWER

Explain how CO2 is able to control flame

Posted by Bhumika Choudhary 3 years, 10 months ago

CBSE > Class 08 > Science

3 answers

Shreya Jha 3 years, 10 months ago

Carbon dioxide is used in fire extinguishers as being heavier than oxygen it surrounds the burning combustible substance like a blanket. This cuts off the contact between the burning combustible substance and oxygen supply and brings down the ignition temperature of the the combustible substance that is substance which caught flame . so the fire is controlled. i hope this answer was helpful . thanks

0Thank You

Vikas Sheoran 3 years, 10 months ago

0Thank You

Yogita Ingle 3 years, 10 months ago

Carbon dioxide is heavier than oxygen, covers the fire like a blanket. Since the contact between the fuel and oxygen is cut off, the fire is controlled. The added advantage of CO2 is that in most cases it does not harm the electrical equipment.

2Thank You

ANSWER

Earth's plates

Posted by Abhishek Yadav 3 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Mohamed Fazil 3 years, 10 months ago

earth plate an electrode in the form of a metal plate burried in external soil used to earth the electrical system of a building

1Thank You

ANSWER

What is silicon

Posted by Shruti Dudhate 3 years, 10 months ago

CBSE > Class 08 > Science

3 answers

Priyanka Kumari 3 years, 10 months ago

A metalloid

0Thank You

Aayushi Dutt Sharma 3 years, 10 months ago

Silicon is a mixture of metal and non metal

0Thank You

Yogita Ingle 3 years, 10 months ago

Silicon (Si), a nonmetallic chemical element in the carbon family (Group 14 [IVa] of the periodic table). Silicon makes up 27.7 percent of Earth’s crust; it is the second most abundant element in the crust, being surpassed only by oxygen.

0Thank You

ANSWER

explain how a magnetic and a bulb help in testing the conduction of electricity by different materials. which of the two is more effective in testing the conduction of electricity by liquids? give a reason for your answer

Posted by Ojasvi Nishad 3 years, 10 months ago

CBSE > Class 08 > Science

0 answers

ANSWER

what is a fertilised egg called

Posted by Yogendra Singh 3 years, 10 months ago

CBSE > Class 08 > Science

5 answers

@Kashish Sharma 3 years, 10 months ago

Zygote

0Thank You

𝓼𝓷𝓮𝓱𝓪 𝓢𝓾𝓶𝓪𝓷 3 years, 10 months ago

The fertilized egg (zygote) divides repeatedly as it moves down the fallopian tube to the uterus. First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst

0Thank You

_Priya _Kashyap_ 3 years, 10 months ago

Zygote

0Thank You

Yogita Ingle 3 years, 10 months ago

During fertilisation, the nuclei of the sperm and the egg fuse to form a single nucleus. This results in the formation of a fertilised egg called Zygote. F

1Thank You

Krishna Kushwaha 3 years, 10 months ago

Hncncnc

0Thank You

ANSWER

What is the after Eno + dettol

Posted by Sathvik Goud 3 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Anmol Kumar 3 years, 9 months ago

See video of Crazy X Y Z,Mr Indian Hackar

0Thank You

ANSWER

What are the use of honey

Posted by Sunil Singh 3 years, 10 months ago

CBSE > Class 08 > Science

2 answers

Akki Ikka 3 years, 10 months ago

What is your name

0Thank You

Gaurav Seth 3 years, 10 months ago

Honey has medicinal value specially in disorders that are related to digestion and liver ailments.
As it contains iron and calcium, it also helps in the growth of the body.
It is used as a source of sugar in various confectionery items.

1Thank You

ANSWER

what is a tuber crop

Posted by Hema Sai Sri Nimmalapudi 3 years, 10 months ago

CBSE > Class 08 > Science

2 answers

Yash Malhotra 3 years, 10 months ago

he duration of the test is 30 minutes. You will not be able to submit the test after the time is over. There will be total 15 MCQ in this test. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number. For every question there will be only one correct option out of the four given options. Each question carries one mark. There is no negative marking for incorrect choice. For moving to the next question, click on "Next" at the bottom of the screen. Questions can be answered in any order in given time. For moving to previous question click on "PREVIOUS" at the bottom of the screen. Students can mark the question for review too. Students can make changes in their choice of options before clicking the "SUBMIT" button. After completing all the questions, click "SUBMIT" button. A message will be displayed on the screen "Do you really want to submit ?". If student click on "NO", the will be redirected to the test page again and if they press "YES", the result will be displayed on the screen with details of questions attempted.

0Thank You

Gaurav Seth 3 years, 10 months ago

A n s w e r
Tuber crops are crops with swollen underground stems and roots. ... They store carbohydrates in their tubers. They are majorly a source of food known as Carbohydrates

1Thank You

ANSWER

What is known as crop rotation

Posted by Santhosh K 3 years, 10 months ago

CBSE > Class 08 > Science

2 answers

Yash Malhotra 3 years, 10 months ago

0Thank You

Prateeksha Sp 3 years, 10 months ago

Crop rotation is the practice of planting different crops sequentially on the same plot of land to improve the soil health.

3Thank You

ANSWER

Chapter 1 Keywords

Posted by Bharti Pongotra 3 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Yash Malhotra 3 years, 10 months ago

0Thank You

ANSWER

How do metals react with acid explain

Posted by Savita Vishnoi 3 years, 11 months ago

CBSE > Class 08 > Science

2 answers

Yash Malhotra 3 years, 10 months ago

1Thank You

Yogita Ingle 3 years, 10 months ago

Metals react with acids to produce hydrogen gas. If a matchstick is brought near the mouth of the tube containing the product of the reaction then we hear a pop sound. It is this hydrogen gas that burns with a pop sound.

For instance, Magnesium reacts with dilute hydrochloric acid to form magnesium chloride and hydrogen.

Copper does not react with hydrochloric acid but reacts with sulphuric acid.

1Thank You

ANSWER

difference between bulb and bulbule in 3 point

Posted by Roshan Rana Magar 3 years, 11 months ago

CBSE > Class 08 > Science

1 answers

Yash Malhotra 3 years, 10 months ago

0Thank You

ANSWER

What is unit of sound

Posted by Asharani M 3 years, 11 months ago

CBSE > Class 08 > Science

5 answers

Nitu Singh 3 years, 10 months ago

The unit of sound is decibel

0Thank You

Shreya Jha 3 years, 10 months ago

its decibel answer .

0Thank You

Shreya Jha 3 years, 10 months ago

the SI unit of sound is decibal (dB).

0Thank You

. . 3 years, 10 months ago

The unit of sound is decibal

0Thank You

Gaurav Seth 3 years, 11 months ago

Decibel

Sound is another form of energy that travels in the form of waves either through a liquid, air, or even solid substances. Since this energy can be measured, the most common SI unit of sound that is used is Decibel which is abbreviated as dB.

0Thank You

ANSWER

Radhey prefers to go to school by pooling car .on other occasion he like to opt for public transport .for short distances ,he walks or uses bicycle (a) what are the benifits of carpooli g

Posted by Bhumika Choudhary 3 years, 11 months ago

CBSE > Class 08 > Science

1 answers

Gaurav Seth 3 years, 11 months ago

The following are the benefits of car pooling:
1. It is Cost effective.
2. It results in reduction of pollution
3. It leads to reduction traffic on roads.
4. It helps in saving of fossil fuels.

4Thank You

ANSWER

Define resultant force?

Posted by Banarasiya Don???? 3 years, 11 months ago

CBSE > Class 08 > Science

1 answers

Gaurav Seth 3 years, 11 months ago

When there is more than one force acting upon the same body. The different forces is altogether replaced by a single force. This force is called resultant force.

The formula of resultant force is F∨R = F∨1 + F∨2 + F∨3
If the force F∨2 is perpendicular to the force F∨1 then the formula is
F∨R = F∨1 + F∨3 - F∨2

EXAMPLE --
If three forces 60N , 45N and 30N are acting on a body simultaneously. 30N is opposite to the direction of other two. Calculate the resultant force.

SOLUTION --
As per the formula we will place the quantities.

(60N + 45N) - 30N
105N - 30N
= 75N

Hence, the resultant force for the question asked is 75N.

1Thank You

ANSWER

Ch of sc coservation of bio Of icgse board link with it answers

Posted by Ayush Sharma 3 years, 11 months ago

CBSE > Class 08 > Science

2 answers

Yash Malhotra 3 years, 10 months ago

0Thank You

Ayush Sharma 3 years, 11 months ago

Igcse*

2Thank You

ANSWER

Why does a feather float on water?

Posted by Bani Singh Bani Singh 3 years, 11 months ago

CBSE > Class 08 > Science

3 answers

Shreya Jha 3 years, 10 months ago

The feather floats on water because the density of the feather is less as compared to water. Any light substance whose density is less as compared to water will float in water. Thats why the lighter things do not sink in the water instead it floats on the water.

1Thank You

Manya Khatri 3 years, 11 months ago

Coz feather have low weight than water....

0Thank You

Aryaman Pandey 3 years, 11 months ago

A feather floats in water because it's density is less than that of the water .

2Thank You

ANSWER