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If valency of an element X is 2 then what will be the valency of its oxide?

Posted by Yash Sharma 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Akanksha Kumari? 7 years, 2 months ago

XO Since valency of X is 2 and that of oxide is -2 Thus X O 2 -2 X2O2 = XO

ANSWER

What is a location and function of companion cells

Posted by Yamini Kaithal 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Sneha Mittal 7 years, 2 months ago

Companion cells are present in phloem. They helps in short distance transport of food.

ANSWER

What is small g and big G.

Posted by Subrat Nayak 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Akanksha Kumari? 7 years, 2 months ago

G is gravitational constant and g is acceleration due to gravity

ANSWER

What is Gravitation .

Posted by Subrat Nayak 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 2 months ago

Gravitation is the force of attraction between any two bodies in this universe . Gravitation or gravity is everywhere, it is the force that keeps us stuck to the ground, drives the planets around the sun and the same force that pulls you down a slide.

ANSWER

Write bohr model for (1.) Cl- & (2.) Al+³

Posted by Saahil Khanna 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Write bohr model for _ +3 1) CL. 2) Al

Posted by Saahil Khanna 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

An underwa

Posted by Vardaan Gupta 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Give an example of longitudinal wave except sound ?

Posted by Krishtina Ete 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 2 months ago

For longitudinal wave the vibration of the particles of the medium are in the direction of wave propagation. Examples of longitudinal waves are sound waves, tsunami waves, earthquake P waves, ultra sounds, vibrations in gas, and oscillations in spring, internal water waves, and waves in slink etc.

ANSWER

Name a device which converts electrical energy to mechanical energy

Posted by Om Sethi 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 2 months ago

A generator converts mechanical energy into electrical energy, while a motor does the opposite - it converts electrical energy into mechanical energy. Both devices work because of electromagnetic induction, which is when a voltage is induced by a changing magnetic field.

ANSWER

calculate the amount to be paid for the month of january a. when tube light each of power 40W opparated for 8hrs. a day . b. 3electric heater each of power 1500W opparated for 14 hour a day . c. 4 computers each of power 100W opparated for 4 hour a day

Posted by Sivnath Toppo 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Which division among plants has the simplest organisms?

Posted by Deepak . 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Sneha Choudhury 7 years, 2 months ago

Thallophyta

ANSWER

Mathematical expression of potential energy

Posted by Nishant Singh 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Deepak . 7 years, 2 months ago

mgh where m=mass, g=gravity force andh=height

ANSWER

What do you understand by diploblasty

Posted by Shivaji Viswakarama 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Krishtina Ete 7 years, 2 months ago

Organisms which are drived from two embroyonic germ layers- Ectoderm and Endoderm

ANSWER

What is the mass of 5 mol of ammonia.

Posted by Manoj Kumar Singh 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Gaurav Kumar 7 years, 2 months ago

17×5=85u

ANSWER

What is acceolomate

Posted by Diksha And Kushagra Pathak 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Gaurav Kumar 7 years, 2 months ago

Acoelomate animals are called acoelomates and they have no true body cavity. The acoelomate phyla are Placozoa , Porifera , Cnidaria , Ctenophora , Platyhelminthes, Mesozoa, Nemertina, Gnathostomulida. Pseudocoelomate animals have a pseudocoelom. They have a body cavity but it is not lined with mesodermal cells.

ANSWER

what is tisseu

Posted by Swati Raw Swati Raw 7 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Akshita Yadav 7 years, 2 months ago

.... origin that together carry out a specific function.

Akshita Yadav 7 years, 2 months ago

Tissue is a cellular organizationallevel between cells and a complete organ. It is an ensemble of similar cells and their extracellular matrix from the same origin that

Magma Rocks 7 years, 2 months ago

A group of cells that collectively perform a specific function is called tissue.~Magma Rocks???. ?

Ansh Yadav 7 years, 2 months ago

A group of cell but same structure is called tissue

Anjali Dubey Dubey 7 years, 2 months ago

The group of cell is called tissue

ANSWER

Explain the working and application of a sonar.

Posted by Prashansa Pranjal 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Payal Sharma 7 years, 2 months ago

•)sonar system consist of a transmitter ,detector and receptor.transmitter produce and transmits ultra sonic waves and these waves travels through water and after stricking the object at the bottom of the sea are reflected back and recieved by detector then these waves are converted into electrical signals by detector. Total distance travel by wave =2d = v*t. So' sonar is a device which is used to find distance direction and speed.

Srashti Patwa 7 years, 2 months ago

SONAR is an acronym for Sound Navigation And Ranging. It is an acoustic device used to measure the depth, direction, and speed of under-water objects such as submarines and ship wrecks with the help of ultrasounds

ANSWER

How does the sound produced by a vibrating object in a medium reach your ear?

Posted by Nikhil Kumar 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Prashansa Pranjal 7 years, 2 months ago

The sound produced by vibrating object reaches our ear through sound waves which travel in the medium as a series of compression and rarefactions caused by the vibrations of the particles of the medium.

ANSWER

Differentiate between longitudinal and transversal waves

Posted by Lucky Bhati 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Akshita Yadav 7 years, 2 months ago

TRANSVERSE WAVE : Displacement of the medium is perpendicular to the direction of propagation of the wave. .....LONGITUDINAL WAVES : Displacement of the medium is parallel to the direction of the propagation of the wave .

Akshita Yadav 7 years, 2 months ago

TRANSVERSE WAVE: D

ANSWER

Valency of an element is 3 what is its oxide

Posted by Anjali Dixit 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Palak ?? 7 years, 2 months ago

?sorry it will be XO3

Palak ?? 7 years, 2 months ago

It will be XN3

ANSWER

What is the charge on cathode rays What is difference between cathode and anode rays. Write any 3 points

Posted by Rose Chopra 7 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Navreen Kaur 7 years, 2 months ago

Cathode ray is the positive charge radiation.....anode ray is the negative charge

Srashti Patwa 7 years, 2 months ago

It is a stream of these positive ions that are known as 'anode rays'. ... On the other hand, the cathode ray is an electron beam emerging from the cathode striking the anode plate. This is negatively charged, and particles are electrons whose e/m ratio is constant for all gases, and is known as the Universal Constan

Srashti Patwa 7 years, 2 months ago

J. J. Thomson showed that cathode rays were composed of a previously unknown negatively charged particle, which was later named the electron. Cathode ray

ANSWER

Which gas is required for photosynthesis

Posted by Elakkiya Murugaiyan 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Anjali Dubey Dubey 7 years, 2 months ago

Co2

Akanksha Kumari? 7 years, 2 months ago

Carbon dioxide

ANSWER

What is meristmetic tissue?

Posted by Hritik Chauhan 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Akanksha Kumari? 7 years, 2 months ago

Meristematic tissue is present for plants which is also known as growth tissue. It is responsible for the growth of plants.

ANSWER

Why meristematic tissues does not have vacuoles

Posted by Elakkiya Murugaiyan 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Nandana Nair 7 years, 2 months ago

Vacuoles provide turgidity and rigidity .Meristematic tissue are capable for cell division so there is no need of vacuoles

ANSWER

if the name the two organelles we have studied that contain thier own genetic material

Posted by Kundan Singh 7 years, 2 months ago

CBSE > Class 09 > Science

4 answers

Sneha Rose Vinod 7 years, 2 months ago

mitochondria and plastids

Abinash Mohanty 7 years, 2 months ago

Mitochondria and plastids

Elakkiya Murugaiyan 7 years, 2 months ago

Mitochondria and plastids

Aryan Dora 7 years, 2 months ago

Mitochondria and chloroplast

ANSWER

Tabulate the difference between true solution and suspension with respect to: a)Filtration b)Transparency c)stability

Posted by Vibha Ahuja 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Define antigen, antibody, antibiotics,pathagons?

Posted by Aadhi Cc 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Shaik Haneef 7 years, 2 months ago

Pathogens are diseas caused by bacteria

Yogita Ingle 7 years, 2 months ago

Antigens are substances that stimulate the immune system to produce antibodies. Each antigen has a distinct surface feature or epitope. Thus there is a resultant effect of a specific response. Antigens could be anything like a pathogen or bacteria or fungi or even virus. They cause diseases or allergic reactions.
An antibody is an immunoglobulin. It is a Y shaped molecule which is basically a protein that is produced by the B cells of the immune system. Antibodies are produced in response to the exposure to antigens.
Antibiotics are substances that slow down or stop the growth of bacteria.
Pathogens are infectious agents which cause diseases.

ANSWER

Precaution is better than cure . Justify the statement?(connected with the chapter-why do we fall ill)

Posted by Aadhi Cc 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Shivam Yadav 7 years, 2 months ago

It is said that when we take precaution against the common disease in your surrounding than curing it will be more advantageous to us because when we take immunisation against the disease for any desired year such as for 3 yrars it will not harm our body but it will boost oir immunity. Curing can be harmful for us because we do it when we are suffering from disease, we take too much of drugs and medicines which can harm us in many ways.

Yogita Ingle 7 years, 2 months ago

'Prevention is always better than cure.' This is always true with diseases. Taking some precautions in life prevents us from acquiring diseases. It is tough to undergo symptoms of the disease. Diseases also take some time to be cured. Hence it is better to prevent diseases rather than trying to cure them.

ANSWER

What is electricity

Posted by Maya Rajesh 7 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Manoj Kumar Singh 7 years, 2 months ago

Electricity is a form of energy which help to run electric aplaenses.

Abinash Mohanty 7 years, 2 months ago

Electricity is actually a form of energy.

Sakshi Singh 7 years, 2 months ago

Electricity is a form of energy of modern times

ANSWER

Why is atmosphere essential for life ?

Posted by Mohit Parashar 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Shivam Yadav 7 years, 2 months ago

Atmosphere is essential for life because it acts as a protective blanket for all the organism to exist. It keeps the average temperature of the earth normal. In addition, the ozone layer absorbs the uv rays coming directly from the sun and protects all the life forms on earth.

Yogita Ingle 7 years, 2 months ago

Atmosphere is essential for life for several reasons. Some of these reasons are
(i) Oxygen, which is required for the survival of every living organism is present in the atmosphere.
(ii) Atmosphere works as an iiisulator, it keeps the average temperature of the earth fairly constant during the day and night by preventing escape of heat into outer space.
(iii) Atmosphere also acts as protective blanket for the Earth. It absorbs most of the harmful radiations such as ultraviolet (UV) radiations coming from the Sun. It results in the Earth receiving just the right amount of heat and sun’s rays, which helps in the climate control and allows the living organisms to exist.

ANSWER

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