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Lignin is a chemical substance which acts as cement & hardens the cell wall. This tissue is present in steams, around vascular bundles , in the veins & leaves amd also around seeds & nuts .

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What is agriculture manipulation

Posted by Shivam Maheshwari 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 7 years, 2 months ago

I guess its genetic manipulation.

Answering on this basis.

Genetic manipulation is a process in which genes of desirable characters are taken from a plant and transferred to another plant by the technique of hybridisation. Genetic manipulation helps in obtaining desirable agronomic characters liked Dwarfness in cereals and tallness and profuse branching in fodder crops. It is useful in developing varieties with higher yield, good quality, biotic and abiotic resistance, short maturity period, wider adoptability and desirable agronomic characteristics.

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What's the CGS unit of work done ?

Posted by Aman Anshuman 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Jyotika Pramanik 7 years, 2 months ago

Work done = displacement * force .. In cgs system displacement = 1 cm and force =1dyne =1 dyne * 1cm =1erg

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What is the definition of energy ?

Posted by Aman Anshuman 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Shivam Maheshwari 7 years, 2 months ago

The capacity of doing work is known as energy

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Human body kills every microbe but why our body did not kills the embryo in pregnant lady if she is taking any vaccine?

Posted by Manas Singh 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Jyotika Pramanik 7 years, 2 months ago

It is not killing the embryo because embryo is not a microbe as well as embryo is protected in amniotic bag

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A man throws a d ball weight 500 g vertically upward with a speed of 10 m,s what willbe its initial momentum what would be its momentum at the hightest point of its flight

Posted by Meena Verma 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Meena Verma 7 years, 2 months ago

Answer

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Explain the functioning of Ear

Posted by Kanishka Tyagi 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Aman Anshuman 7 years, 2 months ago

To hear .

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Write the characteristics of nematoda.

Posted by Jeel Babariya 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Abhinav Tiwari 7 years, 2 months ago

The word nema toda means organisms with roundwarm they are bilateraly symetrical and triploblastic paracitic mode of nutrition psedocelmetes ,example ascaris

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Why the color of blood is red

Posted by Shinchan Nohara 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Sweety Muskan 7 years, 2 months ago

Because of iron which is present in hemoglobin.

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Shinchan Nohara 7 years, 2 months ago

Due to hemoglobin

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Properties of reflecting surface

Posted by Ayam Tiwari 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

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Different between broiler and layer

Posted by Aanchal Jaiswal 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Shikha Bhadoria 7 years, 2 months ago

An egg laying poultry is sometimes called a egger or a layer whereas broilers are reared for obtaining meat. So a layer should be able to produce more number of large sized eggs, without growing too much. On the other hand, a broiler should yield more meat and hence should be able to grow well.

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Derive s=ut+1/2a t square?

Posted by Sahil Yadav 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What is evaporation how can the evaluation of a liquid be made faster

Posted by Ravi Kumar 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 2 months ago

Evaporation takes place when a liquid turns into a gas. Evaporation is also known as vaporization. Vaporization usually happens on the surface of the water. It is a slow process and occurs at all temperatures.
Raising the temperature of water increases the kinetic energy of surface molecules, hastening the rate of evaporation. Moving air channels saturated air away from the liquid, effectively lowering concentrations of water and other substances in the local air.

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Helium atom has 2 electrons in its valence

Posted by Rinki Phalswal 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Chētnà Pandey✌️ 7 years, 2 months ago

Yes.. ...

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Atul Kumar 7 years, 2 months ago

Because the last shell of helium have 2 electrons .

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Is it a good app for scoring 90% and above marks in cbse board?

Posted by Ayush Khatri 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Chētnà Pandey✌️ 7 years, 2 months ago

Yes if we are using it properly then it is a good app......

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What is balance force

Posted by Ashish Kumar 7 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Ashu Raj 7 years, 2 months ago

Equal amount of force are applied from the both directions . Resultant of all the the force acting on a body is zero is called balance force.

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Yogita Ingle 7 years, 2 months ago

A force where two forces of equal size, act on a body, in opposing directions is known as a Balanced Force. In Balanced Force, a body continues to be in its position i.e. it may be continuously moving with the same speed and in the same direction or it may be still in its position.
Example of Balanced Forces- Suppose you are pushing a wall and as expected, the wall does not move and neither do you. It means that you and the wall are exerting a balanced force on each other.

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Dhruv Gupta 7 years, 2 months ago

when the resultant of all forces acting on a body is zero then the forces are called balanced forces.

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Drawback of rutherfprd model

Posted by Vishakha Balghuar 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 7 years, 2 months ago

Drawbacks of Rutherford’s Model of an Atom

Rutherford’s atomic model could not explain how the moving electrons could remain in its orbit.
Any charged particle during acceleration would give out energy; and while revolving it would lose energy and eventually fall into the nucleus.
This means that the atom would be highly unstable.
But, matter is composed of stable atoms.
·Thus, the major drawback of Rutherford’s atomic model was that it could not explain the stability of atoms.

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Raghav Chauhan 7 years, 2 months ago

You can check in ncert book of science in 4th chapter

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Drawback of rutherfod model

Posted by Vishakha Balghuar 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 2 months ago

Drawbacks of Rutherford’s Model of an Atom

Rutherford’s atomic model could not explain how the moving electrons could remain in its orbit.
Any charged particle during acceleration would give out energy; and while revolving it would lose energy and eventually fall into the nucleus.
This means that the atom would be highly unstable.
But, matter is composed of stable atoms.
·Thus, the major drawback of Rutherford’s atomic model was that it could not explain the stability of atoms.

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What is the chemical name of dry ice

Posted by Ravi Kumar 7 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Sahil Yadav 7 years, 2 months ago

Solid carbondioxide

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Yogita Ingle 7 years, 2 months ago

Dry ice is the solid form of carbon dioxide (CO₂), a molecule consisting of a single carbon atom bonded to two oxygen atoms. Dry ice is colorless, non-flammable, with a sour zesty odor, and can lower the pH of a solution when dissolved in water, forming carbonic acid (H₂CO₃).

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Saijal Singh 7 years, 2 months ago

CO2

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Mention three differences between mass and weight

Posted by Sahil Simgh 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Saijal Singh 7 years, 2 months ago

"The quantity of matter contained in a body is called the mass of the body *the force with which the earth attracts a body towards its Centre is called the weight of the body " Mass of a body remains constant *weight of a body changes from place to place " mass of a body is never zero *weight of a body at the centre of the Earth is zero "mass is a scalar quantity *weight is a vector quantity "mass is measured in kg * weight is measured in Newton "mass is measured by a beam Balance *weight is measured by a weighing machine or a spring balance (")for mass &(*)for weight

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What is asseration

Posted by Numan Bashir 7 years, 2 months ago

CBSE > Class 09 > Science