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

Ok I hope you understand The improvements in food resources its means in our resources of food to increase /improvements Their are three methods or process to improve the food (1) crop rotation. (2) hybridization /breeding (3) uses of fertilizer or pesticides..

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Why is it difficult to hold a school bag having a strap made of a thin and strong string?

Posted by Jatin Jadon 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Chinki Mehlawat 7 years, 3 months ago

Because low area high pressure,high area low pressure

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S.i unit of wavelenght

Posted by Nihal Purave 7 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Princy Tyagi 7 years, 3 months ago

Meter

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Gaurav Seth 7 years, 3 months ago

S.I unit of wavelength is m i.e metre.

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Chapter 15 improvement in crop yields

Posted by Ankit Jha 7 years, 3 months ago

CBSE > Class 09 > Science

3 answers

Aanchal Jaiswal 7 years, 3 months ago

It is no boring this chapter was so interesting

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Ananya Satapathy 7 years, 3 months ago

What is your question?

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Ananya Satapathy 7 years, 3 months ago

Boring chapter isn't it?

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What is exoskeleton used for

Posted by Chinmay Mahajan 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Naruto Uzumaki??? 7 years, 3 months ago

It helps to give the shape to the body

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What is disadvantage to vegetative propagation

Posted by Shyam Jha 7 years, 3 months ago

CBSE > Class 09 > Science

0 answers

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Difference between pitch and sound

Posted by Jyoti Singh 7 years, 3 months ago

CBSE > Class 09 > Science

3 answers

Kuldeep Mishra 7 years, 3 months ago

Sound: it is the form of energy which produces a sensation of hearing, it a mechanical wave and longitudinal in air. Pitch is defined as that characteristic of sound which distinguishes two sound of same loudness, but of different frequency.

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Aanchal Jaiswal 7 years, 3 months ago

Pitch:- the brain interprets the frequency of an emitted sound is called pitch.. Sound:- is a form of energy which produce a sensation of hearing in our ears is called sound...

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Princy Tyagi 7 years, 3 months ago

Any sensation felt by ear is called a sound

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Explain the kinetic energy of the an object

Posted by Ansh Babel 7 years, 3 months ago

CBSE > Class 09 > Science

5 answers

Tanay Shrivastava 7 years, 3 months ago

Energy possesed by any object due to its vertue of velocity and position

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Sudeepti Sharma 7 years, 3 months ago

Energy due to movement of a body

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Roshan Kumar Sahu 7 years, 3 months ago

If the temperature increases kinetic enegy the particle also increased.

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Roshan Kumar Sahu 7 years, 3 months ago

Due to countious movement of particle kinetic energy formed.

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Palak ?? 7 years, 3 months ago

Energy possessed by an object due to virtue of its motion is known as kinetic energy...

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What is crop rotation?

Posted by Snehal Kumar 7 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Snehal Kumar 7 years, 3 months ago

Sry but this is not proper answer

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Gaurav Seth 7 years, 3 months ago

Crop rotation : crop rotation is the practice of growing a series of different types of crops in the same area in sequential seasons. Advantages of crop rotation: It help in reducing the pests build up. Reduces soil erosion.

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Does starfish come in mollusca phlum also.

Posted by Jaishree Sanodiya 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Gurkirat Singh 7 years, 3 months ago

Yess

2Thank You

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What is kinetic energy of an of an object ? & Potential energy

Posted by Ahana Tiwari 7 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Sushant Kumar 7 years, 3 months ago

KE-ENERGY POSSESED BY AN OBJECT DUE TO ITS MOTION. IT IS "1/2mv^2" PE-ENERGY POSSESED BY A BODY DUE TO ITS POSITION OR CONFIGURATION.IT IS "MGH"

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Ahana Tiwari 7 years, 3 months ago

1. The energy possessed by an object by virtue of its motion is called kinetic energy 2. The energy possessed by an object by virtue of its position is called potential energy

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From what the cell wall of fungi is made?

Posted by Mohit Gedam 7 years, 3 months ago

CBSE > Class 09 > Science

3 answers

Nitin Jangra,?✌ 7 years, 3 months ago

It is made up of complex sugar known as chitin

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Yogita Ingle 7 years, 3 months ago

The cell wall of fungi is made up of cellulose and chitin. Chitin and cellulose are are among the most abundant bio polymers in the marine and terrestrial environments respectively. While cellulose is an organic compound with (C6H10O5)n being the formula and the most common in the Earth, chitin is a polysaccharide which contains nitrogen.

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Chirag Chahar 7 years, 3 months ago

Chitin

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calculate the gravitational force acting on the body of mass 200 kg lifting at the height of 1000 m from the earth surface

Posted by Masum Ansari 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Sushant Kumar 7 years, 3 months ago

(g=10m/s^2) w=mgh=200×1000×10=2×10^6 joule

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Different between work and energy

Posted by Sanidhya Paliwal 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Mohit Gedam 7 years, 3 months ago

They both are actually same. But work can be defined as the product of force and displacement (w=f.t) and energy is the stored ability to do work.w=e ie energy is equal to work done

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Vse bd njan vs

Posted by Vipin Joshi 7 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Manishi Tandon 7 years, 3 months ago

Wre again

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Manishi Tandon 7 years, 3 months ago

I am not understand? ????????

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Define boling point

Posted by Thumsowu Molsoi 7 years, 3 months ago

CBSE > Class 09 > Science

4 answers

Princy Tyagi 7 years, 3 months ago

Any temprature at which any liquid start boiling it is known it's bolining poin Boiling point of water is 100 degree Celsius

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Saurav Kumar 7 years, 3 months ago

A point at which any liquid started to boil is called its boiling point

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Yogita Ingle 7 years, 3 months ago

The boiling point is the temperature at which the vapour pressure of the liquid is equal to the atmospheric pressure of the liquid and the liquid is converted to vapour. The boiling point of the liquid depends upon the pressure of the surrounding. Boiling point of water is 100°C.

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Vipin Joshi 7 years, 3 months ago

100 degri c

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How do ships float in water?

Posted by Omkar K 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Parampreet Kaur 5 years, 11 months ago

Due to archemidez principle

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A ship sends out ultrasound that returns from the seabed and is detected after 4 seconds. If the speed of ultrasound through sea water is 1550m/s, what is the distance of the seabed from the ship?

Posted by Amit Gupta 7 years, 3 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Rna means

Posted by Md Shahzad 7 years, 3 months ago

CBSE > Class 09 > Science

4 answers

Princy Tyagi 7 years, 3 months ago

Ribo nuclie acid this synthesis of protien in our body

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Sudeepti Sharma 7 years, 3 months ago

Rna stands for ribonucleic acid

2Thank You

Md Shahzad 7 years, 3 months ago

Ribonucleic acid

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Yogita Ingle 7 years, 3 months ago

RNA is a ribonucleic acid that helps in the synthesis of proteins in our body. This nucleic acid is responsible for the production of new cells in the human body. It is usually obtained from the DNA molecule. RNA resembles same as that of DNA, the only difference being that it has a single strand unlike the DNA which has two strands and it consists of only single ribose sugar molecule in it. Hence is the name Ribonucleic acid. RNA is also referred to as a enzyme as it helps in the process of chemical reactions in the body.

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Question answer of ch 13

Posted by Shubham Choudhary 7 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Md Shahzad 7 years, 3 months ago

Subject

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Two types of disease

Posted by Akshay Kumar 7 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Princy Tyagi 7 years, 3 months ago

Communicable or non communicable

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Akshay Kumar 7 years, 3 months ago

Acute or chronic

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If the moon attracts the earth, why does the earth not move towards the moon?

Posted by Aanchal Jaiswal 7 years, 3 months ago

CBSE > Class 09 > Science

3 answers

Princy Tyagi 7 years, 3 months ago

Bcoz earth has gravitational force and more weight than moon

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Ram Kushwah 7 years, 3 months ago

Actually in the circular motion the force due to gravity is balanced by the centripetal force towards centres of earth and moon both,This balances moon and earth both.

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Sagar Rana 7 years, 3 months ago

Bcs the weight and gravitational force of earth is more than that of moon

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why sound is considered as mecnical wave

Posted by Sangita Ankita 7 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Princy Tyagi 7 years, 3 months ago

Becoz sound need medium to travel and sound is in form of energy so sound is consider as mechanical wave

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Aanchal Jaiswal 7 years, 3 months ago

Mechanical wave:- sound waves are characterised by the motion of in the medium and are called particles mechanical wave

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what r the transverse wave

Posted by Sangita Ankita 7 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Princy Tyagi 7 years, 3 months ago

The motion of its particle is horizontal and parllel to wave.and particles move in up and down sound wave is transvese wave

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Yogita Ingle 7 years, 3 months ago

A wave in which the particles of medium vibrate up and down at right angle to direction in which wave is moving is called transverse wave. Transverse wave can be produced only in solid and liquids but not in gases. Transverse wave is one in which individual particles of medium move about their mean position in a direction perpendicular to the direction of wave propagation.

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relationship between k.e and mumentom

Posted by Nishant Sharma 7 years, 3 months ago

CBSE > Class 09 > Science

0 answers

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What do you mean by sonic boom

Posted by Deepak Kumar 5 years, 11 months ago

CBSE > Class 09 > Science

1 answers

Aanchal Jaiswal 7 years, 3 months ago

When a sound producing source moves with a speed higher than that of sound it produces shock wave in air these shock waves carry a large amount of energy.. The shock waves produce by a supersonic aircraft have enough energy to shatter glass and even damage building

1Thank You

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valency of an element X is 3 write a write the chemical ftormula of its oxide

Posted by Gaurav Prajapat 7 years, 3 months ago

CBSE > Class 09 > Science