CBSE > Class 09 > Science | CBSE Board | Homework Help

Yes human body is made up of atoms or cell because cell is made up of molecules, molecules are made up of elements and elements are made up of atoms...

1Thank You

ANSWER

What is the chemical formula of aluminium sulphide

Posted by Arya Magade 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 2 months ago

Aluminum oxide has a chemical formula Al₂O₃. It is amphoteric in nature, and is used in various chemical, industrial and commercial applications. It is considered an indirect additive used in food contact substances by the FDA. Aluminum oxide is a white odorless crystalline powder.

1Thank You

ANSWER

What is diffusion and its examples

Posted by Gurdeep Wadhwa 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Kavya Kr 7 years, 2 months ago

Diffusion is the process in which molecules move from higher concentration to the lower concentration.

0Thank You

Priyanka Chaudhary 7 years, 2 months ago

Diffusion is gaseous exchange between the cell contents and its external environment. Eg oxygen diffuses in water which is taken by aquatic animals to breathe. If you like the answer thank me.

1Thank You

ANSWER

How does animal husbandary beneficiary society by supplementary nutritive food

Posted by Raj Vatsa 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Reason for the fractional atomic masses of elements

Posted by Km Rani 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 2 months ago

The atomic masses of most elements are fractional because they exist as a mixture of isotopes of different masses. The relative atomic mass of any element is the weighted average of the relative atomic masses of its natural isotope

Most elements occur as a mixture of isotopes of different masses. The fractional atomic masses arise because of this mixture.

Avg. mass = total mass of all atoms/number of atoms.

0Thank You

ANSWER

Relation between valency and velance electron

Posted by Km Rani 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Sayahnika Mishra 7 years, 2 months ago

The number of electron present in outermost orbit of an atom is called valence electron. The combining capacity of an atom is called valency

0Thank You

ANSWER

Relationship between mass numbers and atomic number

Posted by Km Rani 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Poorvi Jain 7 years, 2 months ago

Mass no. = no. Of proton +no. of neutron Atomic mass =no. of proton So, mass number = atomic number + number of neutron A=Z+number of neutrons

1Thank You

Babul Kumar 7 years, 2 months ago

Mass number=no. Of protons & no.of neutrons, atomic no=no.of protons.

1Thank You

ANSWER

Discribe motion

Posted by Dheeraj Upraity 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 2 months ago

A body is said to be in motion if it changes its position with respect to fixed point or objects around it .

Explore the different types of motions in your daily life:
Oscillatory motion - motion of swing
Rectilinear motion - motion of car on straight road
Rotational motion - motion of merry-go-round

1Thank You

ANSWER

Agronomical practices of rice.

Posted by Raj Vatsa 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Raj Vatsa 7 years, 2 months ago

What?

0Thank You

Mit'S Patel 7 years, 2 months ago

This is one type of disease

0Thank You

ANSWER

A sheet of paper and a stone was dropped from the first floor of a building together. which of the two will reach the ground first and why ?

Posted by Sonali Pal 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 7 years, 2 months ago

Take a sheet of paper and a stone. Dropthem simultaneously from the first floorof a building. Observe whether both ofthem reach the ground simultaneously.•We see that paper reaches the groundlittle later than the stone. This happensbecause of air resistance. The air offersresistance due to friction to the motionof the falling objects. The resistanceoffered by air to the paper is more thanthe resistance offered to the stone.

0Thank You

Sonali Pal 7 years, 2 months ago

Which isotope of hydrogen atom have same number of electron , proton and neutron and how much is the number

0Thank You

ANSWER

How genetically modified crops can be obtained

Posted by Gurleen Saini 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 7 years, 2 months ago

GMO’s are created in the laboratory using scientific methods like Recombinant DNA technology and Reproductive cloning.

In Recombinant DNA technology, one or more genes of one organism are inserted into another organism’s DNA. On the other hand, Reproductive cloning involves the extraction of the nucleus from the cell of the organism that needs to be cloned and it is inserted into the cytoplasm present in the cell of another organism. This results in their creation.

0Thank You

Gaurav Kumar 7 years, 2 months ago

Through intergeneric hybridisation

1Thank You

ANSWER

Compare the use of manure and fertilizer in maintaining soil fertility

Posted by Renju Gopakumar 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 7 years, 2 months ago

<th>BASIS FOR COMPARISON</th> <th>MANURE</th> <th>FERTILIZER</th>

Meaning	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.
Preparation	Prepared in fields	Prepared in factories
Humus	It provides humus to the soil.	It does not provide humus to the soil.
Nutrients	Comparatively less rich in plant nutrients.	Rich in plant nutrients.
Absorption	Slowly absorbed by plants	Quickly absorbed by plants
Cost	It is economical	It is costly
Side effect	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.

2Thank You

ANSWER

Tel me structur of a hydrogen atom

Posted by Tanishq Jaiswal 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Jigarjit Singh Gill 7 years, 2 months ago

A hydrogen atom is an atom of the chemical element hydrogen ?

0Thank You

ANSWER

Name the two types of processes occuring in neuron.

Posted by Shruti Jaiswal 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Gaurav Kumar 7 years, 2 months ago

To receive message and to convey messagr

0Thank You

ANSWER

What is meant by sounds

Posted by Anupma Jadhav 7 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Gaurav Kumar 7 years, 2 months ago

Sound is form of energy which gives us sensation of hearing.... Sound travel fastest in solid

1Thank You

Yogita Ingle 7 years, 2 months ago

Sound is a form of energy and it comes from vibrations. These vibrations create sound waves which move through mediums such as air and water before reaching our ears. Sound is produced due to the vibration of objects. Vibration is the rapid to and fro motion of an object.

1Thank You

Shruti Jaiswal 7 years, 2 months ago

Sound is a form of energy which enables us to hear....

2Thank You

ANSWER

Short note on kidneys

Posted by Anupma Jadhav 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 2 months ago

Kidney: Kidney is a bean-shaped organ which lies near the vertebral column in the abdominal cavity. The kidney is composed of many filtering units; called nephrons. Nephron is called the functional unit of kidney.

0Thank You

ANSWER

How does animal husbandary beneficiary society by supplementary nut4itive foods.

Posted by Raj Vatsa 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Agronomical pratices for rice.

Posted by Raj Vatsa 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What is ment by acc.

Posted by Naman Pandey 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Most important questions from chapter matter in our surroundings

Posted by Mohit Sharma 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Gaurav Kumar 7 years, 2 months ago

Latent heat

0Thank You

ANSWER

What are lysosomes know as suicide bags

Posted by Shivam Chouhan 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Goutham Krishna 7 years, 2 months ago

Lysosomes known as suicidal bag because they degenerate the cell in emergency. They have a powerful secretive fluid created from endo plasmid reticulum

1Thank You

ANSWER

Define polyatomic ions

Posted by Ashish Kumar 7 years, 2 months ago

CBSE > Class 09 > Science