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

because female mosquitoes have to prepare thier egg by the heat of the blood gather by human body so always female mosquitoes bite human body male never bite

1Thank You

Esvy Dewangan 3 years, 6 months ago

It is not the answer

1Thank You

Mr. Infiniti 3 years, 6 months ago

Because our blood has various types of starch , proteins , etc. During pregnancy of mosquito they want healthy things to feed on so it will be good for mosquito baby

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ANSWER

Derivation of equation of motion graphically

Posted by Barbie $ 3 years, 6 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Why Covid becomes more dangerous in Co Morbidity ?

Posted by Hritesh Nayak 3 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Divanshu Garg 3 years, 6 months ago

I don't know

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ANSWER

What happens if Hemoglobin does not function properly ?

Posted by Hritesh Nayak 3 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Suzan Bihari 3 years, 6 months ago

We will die

1Thank You

Tarh Tanya 3 years, 6 months ago

as it gives colour to our blood and help in formation of blood. so if hemo globlin is absent in our body then there will be lack of blood and its.colour, which is in red.

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Why Covid Spread more in Co Morbidity ?

Posted by Hritesh Nayak 3 years, 6 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Why we get shock when we touch a wet current system while we are not a metal ???

Posted by Preet Kumar 3 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Akshiii ?? 3 years, 6 months ago

We get shock when we touch WET current system becoz water is a good conductor of electricity. But Pure water is not a good conductor of electricity becoz it contains very ions that's why pure water is a poor conductor of electricity whereas tap water is good conductor of electricity becoz it contains dissolved salts in it which readily ionizes or dissociates to ions Na+ and Cl- that can float through the water carrying charge and thus conducts electricity.

1Thank You

ANSWER

State the law of constant proportions

Posted by Rajeev Sharma 3 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Farhan Ahmed 3 years, 6 months ago

The law of constant proportions states that chemical compounds are made up of elements that are present in a fixed ratio by mass. This implies that any pure sample of a compound, no matter the source, will always consist of the same elements that are present in the same ratio by mass.

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ANSWER

Why plasma membrane is called selective permeable membrane

Posted by Mr Sourav 3 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Preet Kumar 3 years, 6 months ago

No your answers are wrong . Any object come or go outside from cell go through atleast one layer of plasma membrane. Thatswhy it is called selectively permeable membrane.

1Thank You

Himanshi Chauhan 3 years, 6 months ago

B'coz it allow the entry of substance into cell and exit of some other substance from the cell. ???

1Thank You

Kottapalli Lavie 3 years, 6 months ago

It also prevent movement of some other materials like cell membrane this is why it is called selectively permeable

2Thank You

Avinash N 3 years, 6 months ago

What is tissues

1Thank You

Utkarsh Paliwal 3 years, 6 months ago

because it only allows selective thing to diffuse through it

2Thank You

ANSWER

s.i unit of velocity

Posted by Vanshika Rajak 3 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Preet Kumar 3 years, 6 months ago

Metre per second or m/s

1Thank You

Hemu Prajapat Kumari 3 years, 6 months ago

Meter per second

2Thank You

C.J.Ramiya Krishna 3 years, 6 months ago

m/s

1Thank You

Nitya Gupta 3 years, 6 months ago

Meter per second

3Thank You

Mr Sourav 3 years, 6 months ago

m/s

3Thank You

ANSWER

What is kinetic engrgy

Posted by Mansi Yadav 3 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Esvy Dewangan 3 years, 6 months ago

The energy possessed by an object by virtual of his motion is called kinetic energy

0Thank You

Ranjeet Kumar Pandit?? 3 years, 6 months ago

The energy possessed by due to the motion of a body is known as it's kinetic energy

0Thank You

Rishi Yadav 3 years, 6 months ago

The energy possessed by a moving body by virtue of its motion is called kinetic energy.

0Thank You

Mansi Yadav 3 years, 6 months ago

The energy possessed by a body by virtue of its motion is called kinetic engrgy

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Raghav Seth 3 years, 6 months ago

Sorry i am also asking same Pls tell

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ANSWER

How many law of Newton and write down the answer with dis describe all laws

Posted by Avinash Yadav Avinash 3 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Nitya Gupta 3 years, 6 months ago

The first law states that an object either remains at rest or continues to move at a constant velocity, unless it is acted upon by an external force.[1] The second law states that the rate of change of momentum of an object is directly proportional to the force applied, or, for an object with constant mass, that the net force on an object is equal to the mass of that object multiplied by the acceleration. The third law states that when one object exerts a force on a second object, that second object exerts a force that is equal in magnitude and opposite in direction on the first object.

3Thank You

Rishi Yadav 3 years, 6 months ago

There are three law of Newton Law of inertia. Law of conservation of momentum. Every action has equal and opposite reaction.

2Thank You

ANSWER

What you think about impulse

Posted by Avinash Yadav Avinash 3 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Subhadeep Das. 3 years, 6 months ago

The product of force and time is impulse. This means CHANGE OF MOMENTUM is impulse.

0Thank You

ANSWER

What is mass of earth and moon?

Posted by Avinash Yadav Avinash 3 years, 6 months ago

CBSE > Class 09 > Science

4 answers

Ayushman Kumar 3 years, 6 months ago

Mass of earth = 6× 10^24 kg

0Thank You

Himanshi Chauhan 3 years, 6 months ago

Mass of moon is 0.07346 Mass of earth is 5.9724

0Thank You

Mr Sourav 3 years, 6 months ago

Mass of moon 1/6 of mass of earth

0Thank You

Rishi Yadav 3 years, 6 months ago

Mass of moon is 1by 6th of the earth

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ANSWER

In your everyday life you comes across a range of motions in which A . acceleration is against tje

Posted by Sadhna Singh 3 years, 6 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Ques- what is the difference between Acceleration and Velocity?

Posted by Riya Sharma💜🤞 3 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Preet Kumar 3 years, 6 months ago

Acceleration is change in velocity in given time and velocity is vector quantity if speed.

0Thank You

Utkarsh Paliwal 3 years, 6 months ago

VELOCITY- speed with direction means it is a vector quantity that have both directions and magnitude s ACCERALATION -rate of change of velocity .

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Avinash Yadav Avinash 3 years, 6 months ago

Acceleration is increasing or decreasing speeding direction,and that velocity is how much covered distance in given time .(acceleration it's speed , direction and both chang but velocity is the rate at chang over time )

0Thank You

Tosayanti Bhoi 3 years, 6 months ago

Acceleration is increasing or decreasing speed or changing direction, whereas velocity is how much distance you cover in a given amount of time. ... The rate at which velocity changes over time;an object accelerates its speed,direction, or both change.

2Thank You

Hard Male 3 years, 6 months ago

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Describe plant tissue

Posted by Vipul Kumar 3 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Kishan Kumar 3 years, 6 months ago

A disease is a particular abnormal condition that negatively affects the structure or function of all or part of an organism, and that is not due to any immediate external injury

3Thank You

Akshiii ?? 3 years, 6 months ago

Plant tissue is a collection of similar cells performing an organised function for the plant. Each plant tissue is specialized for a unique purpose and can be combined with other tissues to create organs such as leaves, flowers, stems and roots.

2Thank You

ANSWER

Symptoms and prevention of adis

Posted by Annuradha Chaudhary Annuradha 3 years, 6 months ago

CBSE > Class 09 > Science

1 answers

C.J.Ramiya Krishna 3 years, 6 months ago

Symptoms: Swollen lymph nodes , regular fever and sweating at night , weight loss, loss of memory and ability to speak and think. Frequent occurrence of viral , bacterial and fungal infection.....

0Thank You

ANSWER

Differentiate between electron, proton neutron

Posted by Prem Kumavat 3 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Adarsh Raikwar 3 years, 6 months ago

Electron contain negative charge Proton contain positive charge Nutron contain no charge

0Thank You

Himanshi Chauhan 3 years, 6 months ago

Electrons are negatively charged species . Neutrons have no charge. Protons are positively charged species. Electrons are discoved by J.J THOMSON Neutron are discovered by J.Chadwick Protons are introduced by E.goldstein. ???

4Thank You

ANSWER

What is mass percentage of a solution ?

Posted by Pawandeep Kaur 3 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Prajwal G N 3 years, 6 months ago

When the solute in a solution is a solid, a convenient way to express the , concentration is a mass percent, which is the grams of solute per 100 g of solution.

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ANSWER

Explain the structure of the bone

Posted by Pushkar Khastoori 3 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Suzan Bihari 3 years, 6 months ago

Bone have High amount of calcium in it is an connective tissue which helps to stand straight

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Ranjeet Kumar Pandit?? 3 years, 6 months ago

Bone is a solid connective tissue formed by the compound of calcium and phosphorus.

0Thank You

ANSWER

What are parenchyma collenchyma

Posted by Haripriya Garg 3 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Himanshi Chauhan 3 years, 6 months ago

These are types of simple permanent tissues.

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Suraj Yadav 3 years, 6 months ago

These are tissues

2Thank You

ANSWER

What is difference between mass and weight ??

Posted by Pata Monalisha 3 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Harpreet Singh 3 years, 6 months ago

Definition • Mass is simply the measure of the amount of matter in a body. • Weight is the measure of the amount of force acting on a mass due to acceleration due to gravity. Denotation • Mass is denoted by “M”. • Weight is denoted by “W”. Formula • Mass is always constant for a body and there are several formulas to calculate mass. • One way to calculate mass is: Mass = volume × density Weight is the measure of the gravitational force acting on a body. Weight can be calculated from the following formula: Weight = mass × acceleration due to gravity Quantity Type • Mass is a base quantity. Mass only has magnitude and so, it is a scalar quantity. • Weight is a derived quantity. Weight has both magnitude and direction (towards the centre of gravity) and so, it is a vector quantity. Unit of Measurement • The SI unit of mass is Kilogram (Kg). • The SI unit of weight is Newton(N). Gravitational Effect • Mass does not depend upon gravity and is constant everywhere. Mass can never be zero. • Weight is dependent on gravity and so, it varies from place to place. Weight can be zero where there is no gravity (like space). Measuring Instrument • Mass can be easily measured using any ordinary balance like beam balance, lever balance, pan balance, etc. • Weight can be measured by a spring balance or by using its formula.

2Thank You

Esvy Dewangan 3 years, 6 months ago

Mass of an object is measure with interia but Weight of an object is the force which is attracted to word the earth

1Thank You

Preet Kumar 3 years, 6 months ago

Mass is scalar but weight is vector quantity. Mass is constant while weight changes according to place.

1Thank You

Mr Sourav 3 years, 6 months ago

Mass the is the amount of matter in the object. Its SI Unit is M. Mass is neither be zero. Weight is product of mass and gravity. Its SI Unit is N. Weight can be zero if accerlation due to gravity is zero

1Thank You

Jaynit Kumar 3 years, 6 months ago

Mass :- mass is the amount of "matter" in an object . Weight :- weight is the force exerted on an object by gravity. ... Objects on the surface of the Earth have weight.

3Thank You

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