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ANSWER

How a rainbow formed?

Posted by Aabha Sahu 6 years, 10 months ago

CBSE > Class 08 > Science

2 answers

Neharika Varshney 6 years, 10 months ago

The sun plays an important role in forming rainbows. The sun shines through the water particles and the water particles act like a prism. A prism is an object thar looks like a transparent , when light passes through it and it spread into bunch of different colours and thus form rainbow.

Gouri Sharma 6 years, 10 months ago

It is formed due to the exchange of lights

ANSWER

What is the important role of male in the *** of male child?

Posted by Rutuja Lomte Sweety 6 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

The *** of a baby to be born is decided at the moment the egg of the woman gets fertilized by the sperm of man because the instructions for determining the *** of the baby are present in the *** chromosomes present in the nucleus of the fertilized egg called zygote.

The *** of the child depends on the following conditions:

When a sperm containing X chromosome fertilises an egg which carries X chromosome, the zygote formed would have two X chromosomes and develop into a female child.
If the sperm contributes a Y chromosome to the egg (ovum) at the time of fertilization, the zygote would develop into a male child.

ANSWER

Why a female can able to give birth to babies but a male cannot?

Posted by Suvam Swain 6 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 6 months ago

In humans, infertility is the inability to become pregnant after one year of intercourse without contraception involving a male and female partner. Male infertility is responsible for 20–30% of infertility cases, while 20–35% are due to female infertility, and 25–40% are due to combined problems in both parts. Infertility is “a disease of the reproductive system defined by the failure to achieve a clinical pregnancy after 12 months or more of regular unprotected sexual intercourse (and there is no other reason, such as breastfeeding or postpartum amenorrhoea).

ANSWER

Why venus is so hot

Posted by Deepak Avsarkar 6 years, 10 months ago

CBSE > Class 08 > Science

3 answers

Gouri Sharma 6 years, 10 months ago

No it is wrong The correct amswer is venus has a lot of co2 which traps heat and make it hot

Krish Sreeniwas 6 years, 10 months ago

As venus is close faster mini it is more hot the area is somwhere about 2000000 cubic feet

Mohit Soni 6 years, 10 months ago

Because it is 2nd closest planet of solar system

ANSWER

How is crude oil formed?

Posted by Ashish Yadav 6 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Vrinda Chhabra 6 years, 10 months ago

Millions of years ago, the plants and animals which lived in the sea died. Their dead bodies sank to the bottom of the sea and were soon covered with clay and sand. Over millions of years, under high pressure and temperature and in the absence of air, the dead remains of plants and animals were slowly converted into petroleum. It then passed through porous rocks and got trapped between non-porous rocks. A more volatile component of petroleum called natural gas forms a cover over it.

ANSWER

What is electric current?explain.

Posted by Neharika Varshney 6 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 6 years, 10 months ago

Electric current as the rate of flow of electrons in a conductor. The protons are tightly packed inside the nucleus of an atom whereas electrons in the outer shells orbits around the nucleus. Since electrons are loosely held by the nucleus, they are able to travel freely within the limits of the body. The SI Unit of electric current is the Ampere.

ANSWER

What is purification of impure copper

Posted by Lakshmy K V 6 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Naman Narwani 6 years, 10 months ago

Electo-refinnig

ANSWER

Khiladi kildar shose kyo pahnta hai

Posted by Suraj Swami 6 years, 10 months ago

CBSE > Class 08 > Science

2 answers

?☺???Hrishi Khapekar???☺? 6 years, 10 months ago

Better grip ke liye

Vaishnavi Shewale 6 years, 10 months ago

Kya paata

ANSWER

Distinguish between infrasonic and ultra sonic sound

Posted by Shravani Deshmukh 6 years, 10 months ago

CBSE > Class 08 > Science

2 answers

Vrinda Chhabra 6 years, 10 months ago

(i) Ultrasonic sounds are sounds whose frequency is more than 20,000 hz. For example- dogs, bats and dolphins (ii) Infrasonic sounds are sounds whose frequency is less than 20 hz.For example-whales, rhinoceroses and elephants.

Aditi Jain 6 years, 10 months ago

Infrasonic sounds are those sounds which are less than 20 hertz whereas ultrasonic sounds are those sounds which are more than 20000 hertz.

ANSWER

Describe how manures different from fertilizer

Posted by Deepa Dasan 6 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 6 years, 10 months ago

<th>Manure</th> <th>Fertilizer</th>

Manure is a natural material, obtained by decaying plant and animal waste, that can applied to the soil to enhance its fertility.	Fertilizer is a human-made or natural substance, that can be added to the soil to improve its fertility and increase the productivity.
Prepared in fields	Prepared in factories
It provides humus to the soil.	It does not provide humus to the soil.
Comparatively less rich in plant nutrients.	Rich in plant nutrients.
Slowly absorbed by plants	Quickly absorbed by plants
It is economical	It is costly
There is no side effect, in fact it improves the physical condition of soil.	It causes harm to the living organism present in the soil.

6Thank You

ANSWER

Why Mangalyaan send to the mars

Posted by Meera Pawar 6 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Dibyajyoti Talukdar 6 years, 10 months ago

Mangalyaan had been sent to Mars for studying it's surfaces and to find many other things about Mars.

ANSWER

What name is given to those sexual characteristics in humans- a) which are present in babies at birth b) which develop in mature bays and girls

Posted by Vasu Bajpai 6 years, 10 months ago

CBSE > Class 08 > Science

5 answers

Vrinda Chhabra 6 years, 10 months ago

Sorry, the correct answer is not adoloscence. They have asked about sexual characteristics.so the correct answer is (a) primary sexual characters (b) secondary sexual characters

?☺???Hrishi Khapekar???☺? 6 years, 10 months ago

a) foetus b)adolescence

Ashwini Choudhary 6 years, 10 months ago

Adolescence

3Thank You

Vaishnavi Shewale 6 years, 10 months ago

b) adolescence

Dibyajyoti Talukdar 6 years, 10 months ago

Adolescence.

ANSWER

How to preperation of rayon

Posted by Isha Awana 6 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Vaishnavi Shewale 6 years, 10 months ago

Rayon is prepared by wood pulp.

ANSWER

What is costillation

Posted by Dilip Malviya 6 years, 10 months ago

CBSE > Class 08 > Science

3 answers

Sahana Mallapur 6 years, 10 months ago

A group of stars forming recongnisable shape ia called constillation . For ex,ursa major,orian,dipper etc

Dibyajyoti Talukdar 6 years, 10 months ago

A group of stars forming a definite shape or pattern in the night sky is called constellation.

Dilip Malviya 6 years, 10 months ago

The stars forming a group that has a recognisable shape is called constillation

ANSWER

List changes in body that takes place in puberty

Posted by Krish Sreeniwas 6 years, 10 months ago

CBSE > Class 08 > Science

2 answers

Vrinda Chhabra 6 years, 10 months ago

(i) increase in height. (ii) change in body shape. (iii) change in voice. (iv) increased activity of sweat and sebaceous glands. (v) development of *** organs. (vi) reaching mental,intellectual and emtional maturity.

Vaishnavi Shewale 6 years, 10 months ago

In girls, menstruation starts, devlopment of breast, hair grows on different parts, more fat is transferred to hip. In boys, hair starts to grow on different body parts, voice becomes harsh

ANSWER

What is mitrochondria

Posted by Sumit Kumar 6 years, 10 months ago

CBSE > Class 08 > Science

3 answers

Vrinda Chhabra 6 years, 10 months ago

Mitochondria are small, rod-like structures found in all cells. They provide energy for all the activities. This energy is produced by the oxidation of food. Thus, they are often called power houses of the cell.

Aditi Jain 6 years, 10 months ago

mitochondria is called power house of a cell. It performs the function of respiration and provides the cell with energy.

Krish Sreeniwas 6 years, 10 months ago

It is a double membraned organelle found most inorganised cells

ANSWER

Rita ate gol gappe and sufferd from dysentery .which microorganism infected rita

Posted by Vaishnavi Singh 6 years, 10 months ago

CBSE > Class 08 > Science

2 answers

Dibyajyoti Talukdar 6 years, 10 months ago

Protozoa.

Babita Gariya 6 years, 10 months ago

Protozoa

ANSWER

Explain the process of reproduction

Posted by Uznaib Fatima Khan 6 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Vaibhav Pandey 6 years, 10 months ago

The human occur in the body of female partner. the process of reproduction start with mating during which male realese male *** cell (sperm) in the body of female partner .sperm comes in the contact of ovum .one of the sperm may fuse with the ovum .the fusion of sperm and ovum is called fertilisation

ANSWER

Why do frog and fish lays many eggs, while a hen lays one egg?

Posted by Yuvika Mourya 6 years, 10 months ago

CBSE > Class 08 > Science

2 answers

Mansi Kumari 6 years, 10 months ago

The hans carry out the internal fertilisation where as the fish carry out the external fer.... So, very low amount of there eggs get fertalised in which many cant survive .

Vasu Bajpai 6 years, 10 months ago

Hens carry out internal fertilisation and due to this the egg gets fertilised but fishes and frogs carry out external fertilisation.... all the eggs do not get fertilised.... eggs even after getting fertilised are not able to survive.... very less eggs make their way to giving new ones... Hope this helps???

ANSWER

Easy way to study science diagram.

Posted by Jerin Peter 6 years, 10 months ago

CBSE > Class 08 > Science

5 answers

Sahana Mallapur 6 years, 10 months ago

First see it neatly,then make it easy

Saurabh Kumar 6 years, 10 months ago

sorry I mean nom.???

Saurabh Kumar 6 years, 10 months ago

what is nom??????????????????????????????

Krish Sreeniwas 6 years, 10 months ago

You can have a look on that diagram and draw without seeing then correct mistakes and again draw

Manoj Maheto 6 years, 10 months ago

Njm

ANSWER

Flame type

Posted by Rudra Sen Singh 6 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

When fuels burn, the type of flame produced depends on the proportion of oxygen available. When the oxygen supply is insufficient, then the fuels burn incompletely and produce mainly a yellow flame and when the oxygen supply is sufficient, then the fuels burn completely and produce mainly a blue flame.

ANSWER

What Will happen if the area is decreased? (Change in pressure)

Posted by Sri Lekha 6 years, 10 months ago

CBSE > Class 08 > Science

2 answers

Vaishnavi Shewale 6 years, 10 months ago

Area increase , pressure decreases

Krish Sreeniwas 6 years, 10 months ago

Decreases

ANSWER

Why is pluto no longer considered to be a planet?

Posted by Ananya Saxena 6 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Mansi Kumari 6 years, 10 months ago

Pluto is not considered as a planet because it is not longer in the solar system . In 2006 it go to far from its old place ,and now the sun rays cant reach there

ANSWER

What is cause of friction

Posted by Ayush Kumar 6 years, 10 months ago

CBSE > Class 08 > Science

3 answers

Isha Isha 6 years, 10 months ago

Friction can be increased by making surface rough

Yaadavi Tandon 6 years, 10 months ago

Or it can be roughness of the surfaces in contact

Yaadavi Tandon 6 years, 10 months ago

Interlocking of irregularities is the basic cause of friction

ANSWER

What do you mean by clonning

Posted by Jatin Vats 6 years, 10 months ago

CBSE > Class 08 > Science

2 answers

Krish Sreeniwas 6 years, 10 months ago

Clonning is that were nucleus and some thing else from mothers and fathers and would bo clonning those two in lab for few days and it will be placed in mothers uterus and baby forms a exact copy of mom will be 5here

Samruddhi Br 6 years, 10 months ago

Clonning is a technique by which an exact copy of a cell, any other part of the body ( living ) or a complete organism can be produced.

ANSWER

How can you change still pictures into a moving film?

Posted by B Shanthi 6 years, 10 months ago

CBSE > Class 08 > Science

0 answers

ANSWER

If there are no ciliary muscle , what will happen?

Posted by B Shanthi 6 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Yaadavi Tandon 6 years, 10 months ago

If there will no ciliary muscles there would have no eye lens and eye because eye lens is held on its position by ciliary muscles

ANSWER

Describe the causes of build up of carbon dioxide in the atmosphere and effect of incresing co2

Posted by Sai Ram 6 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 6 years, 10 months ago

Most of the scientists agree that increased in carbon dioxide in the atmosphere is resulting from the burning of fossil fuels which causes global warming.
However Global warming is not the only effect of CO₂ emission.