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What is winnowing

Posted by Ishita Wadhwa 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Sneha Sharma 7 years, 6 months ago

Winnowing is a process where the solid/ solid mixture has been separated Think so

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From where 1st cell comes in our body ?

Posted by Mrinal Anand 7 years, 6 months ago

CBSE > Class 09 > Science

0 answers

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Plz answer following questions 1). Why a gas exert pressure on the wall of container 2).difference between ammonium chloride and common salt 3).define cricitical temperature and specific heat 4). Explain unsaturated solution with example 5).give reasin:- i . A liquid flows easily . ii . Ice at 0 degree Celsius appears colder in mouth than water at 0 degree Celsius iii. Severe burn takes place by steam in comparison to water at 100 degree Celsius. Plz agar kisi ko b koi b answer pta h to bta dijye (it's a request )?

Posted by Jaiz Kaur 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Neha Panwar 7 years, 6 months ago

1)a gas exerts pressure on the walls of the container because the particles of air have large kinetic energy so it exert force per unit area on the holes of the contain. 4) If the amount of solute contained in a solution is less than the saturated solution it is called an unsaturated solution. ☺️

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Give three features of cardiac muscles?

Posted by Neha Panwar 7 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Rajkumar Yadav 7 years, 6 months ago

It donot work on our will It never get fatty It is only found in heart

1Thank You

Aman Barnwal 7 years, 6 months ago

1) It is also called involuntary muscles 2) it is found in heart 3) they are richly supply with blood

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Anshika Prakash 7 years, 6 months ago

their cells are involuntary , they never get fatigued and their cells are cylindrical and branched

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Why the colour of a blood of a cockroach are white ??????

Posted by Styam Chaudhary 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 6 months ago

Male cockroaches have colorless blood, while the female cockroaches may occasionally have orange blood. This is due to the absence of hemoglobin in their blood (the same cell that makes human blood red). Human beings use hemoglobin to carry oxygen, but cockroaches do not breathe the way we do. Cockroaches use a series of tubes called tracheae for breathing (and exhaling) and in fact they can breathe even in absence of a head. Cockroaches, like other insects, have an open circulatory system and their blood is also known as hemolymph (or haemolymph). It flows freely inside the body, touching all the internal organs and tissues. About 90% of this blood is watery fluid and the remaining 10% is made up of hemocytes. The oxygen is delivered by the tracheal system and not the circulatory system in a cockroaches (or most of the other insects).

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What is the advantages of classification organisms?

Posted by Ayush Saini 7 years, 6 months ago

CBSE > Class 09 > Science

4 answers

Anshika Prakash 7 years, 6 months ago

There are millions of organisms on Earth , we cannot study then in are by Span. Hence , We classify them & learn the common characteristics about them which makes our study easy .

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Lucky Tripathi 7 years, 6 months ago

we can know about simmilarity and difference between different type of organisms

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Account Deleted 7 years, 6 months ago

Understanding and easy to study

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Krishang Parashar 7 years, 6 months ago

There are so many advantages of c of classification of organisms summer as follows if we do not classify the organism we do not calculated typefor what they belong body structure cell organisms organelle is the kingdom

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ANSWER

What is compound???

Posted by Neha Panwar 7 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Aman Barnwal 7 years, 6 months ago

1) a compound is obtained from different kind of atom. 2) a compound can be split into new substances by chemical methods.

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Sonali Aggarwal 7 years, 6 months ago

A substance consisting of atoms or ions of two or more different elements in definite proportions joined by chemical bonds into a molecule. The elements cannot be separated by physical means. Water, for example, is a compound having two hydrogen atoms and one oxygen atom per molecule

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Krishang Parashar 7 years, 6 months ago

Basically compound is made from two different elements

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In the lesson of gravitation it is told that the human body has more density than water thats why if gets sink in water but why a dead body floats on the water after death also it is a human body only??

Posted by Isha Gandecha 7 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Anshika Prakash 7 years, 6 months ago

if you leave your body free in water it will float wether dead or alive......

2Thank You

Prince Yadav 7 years, 6 months ago

Body living or dead has air inside body so dead body also float on water

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What. Is. Taxonomy

Posted by Adarsh Gupta 7 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Aman Barnwal 7 years, 6 months ago

It is the biological science or branch of study in which we deals the identification ,namenclature & classification of the organisms

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Account Deleted 7 years, 6 months ago

The branch of science deals with identification and nomenclature

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Ayush Bhardwaj 7 years, 6 months ago

The science dealing with the identification and classification of organisms

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State the types of tissue in detail? and explain its types.

Posted by Jahanvi Singh 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Aman Barnwal 7 years, 6 months ago

Tissue are two types: 1) plant tissue 2) animal tissue Plant tissue ---- it is a fix tissue ,it need less energy,mostly tissue are dead in this tissue ,they are less complex ,due to activity of meristematic tissue plants continue to grow through out the life & it is two types meristematic tissue & permanent tissue Animal tissue---- it is a mobile tissue ,it need more energy ,mostly tissue are living in this tissue ,these are more complex ,animal do not show after reaching maturity & it is four types epithelium ,muscular ,connective ,nervous tissue

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Why do we see the water droplets on the outer layer of glass when we keep cold water

Posted by Ritik Raj 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Styam Chaudhary 7 years, 6 months ago

Due to the process of condensation

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Water is colourless? And air is also colourless but be can see water air is not seen? why?

Posted by Prashant Kumar 7 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Anshika Prakash 7 years, 6 months ago

If air is colourless then why do we see smoke from Cars?

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Radhika Gupta 7 years, 6 months ago

Sry vijayan but we can store air or gases as we store co2 remember

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Vijayan Ashish 7 years, 6 months ago

Because water has volume but air does not have. We can store water but we can't store air.....

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What is the chemical symbol of tungsten

Posted by Arvind Singh Rathore 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Anshika Prakash 7 years, 6 months ago

2Thank You

ANSWER

Function of simple squamous epithelial tissues

Posted by Pritha Ray 7 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Aman Barnwal 7 years, 6 months ago

Protect underlying parts of organs & act as passage of material

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Prashant Kumar 7 years, 6 months ago

It helps in exchanges of gases and nutritious by the process diffusion

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State any 2 key point of dalton atomic theory and highlight two major drawback of his history

Posted by Tenzin Kelsang 7 years, 6 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What is a foci point

Posted by Abhay Kumar 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

School Student 5 years, 11 months ago

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what is the meaning of 'what' in punjabi?

Posted by Yashleen Kaur 7 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Jaiz Kaur 7 years, 6 months ago

Kii

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Sagar Kumar 7 years, 6 months ago

5Thank You

ANSWER

Distinguish between monera and protista

Posted by Shashank Sonji 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 6 months ago

Monera	Protista
1) Monera are unicellular organism's having prokaryotic cellular structure.	1) Protista are also unicellular organisms though possess eukaryotic cellular organisation.
2) Cellular organelles are absent.	2) Well defined as well membrane-bounded cellular organelles are present.
3) Monera are simple in structure, with no complexity.	3) Protista are complex in structure.
4) Mode of reproduction is asexual by binary fission or budding.	4) Mode of reproduction is both Asexual (binary fission or multiple fission) or sexual.
5) Example: Mycobacteria, Bacillus, Sporohalobacter, Clostridium, Halobacterium.	5) Example: Green algae, red algae, slime molds, euglena, and water molds are the examples of protists.

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Diagram of eukaryotic nucleus

Posted by Oam Tripathy 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 6 months ago

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What is the formula for concentration of solution?

Posted by Pranavi Krishna 7 years, 6 months ago

CBSE > Class 09 > Science

4 answers

Aman Barnwal 7 years, 6 months ago

And and mass by volume percent of a solution is equal to mass of solute by volume of solution in 100 and volume by volume percent of a solution is equal to volume of solute by volume of solution 100 and mass by mass percent of a solution is equal to mass of solute by mass of solution in 100

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Aman Barnwal 7 years, 6 months ago

Mass by mass percent of a solution is equals to mass of solute by mass of solution into 100

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Omkara Ghandwani 7 years, 6 months ago

Concentration of solution =Amount of solute /Amount of solvent OR Concentration of solution=Amount of solute/Amount of solution

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Ash Chhetri 7 years, 6 months ago

Concentration of solution=mass of solution/massof solute x 100

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ANSWER

Write the function of neuron ??

Posted by Ilma Parvez 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Anshika Prakash 7 years, 6 months ago

To transfer nerve impulses from receptors to different parts of the body and vise versa.

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ANSWER

What is tonoplast

Posted by Aditya D 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Anshika Prakash 7 years, 6 months ago

The outer cover of vacuoles is known as tonoplast.

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ANSWER

A=?

Posted by Nayan Chouhan 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Jahanvi Singh 7 years, 6 months ago

A=B

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What is the difference between boiling and evaporation

Posted by Khushi Thapa 7 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Anshika Prakash 7 years, 6 months ago

Boiling can occur only at the boiling point of a substance but evaporation can occur at any temperature.

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Manjot Mann 7 years, 6 months ago

Boiling is a manmade process and it is fast process Evaporation is a natural process and it is slow process

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How to find displacement when we were given initial velocity, 15 m/s . final velocity, 29 m/s and time taken =10sec ??

Posted by Smit Nandaniya 7 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Anshika Prakash 7 years, 6 months ago

I have derived another formula for this: 2s=t(v-u) :So the answer is 70 m

2Thank You

Manjot Mann 7 years, 6 months ago

By using formula v=u+at

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What is tje difference between distillation and fractional disttilation

Posted by Harsh Kumar Singh 7 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 6 months ago

Fractional distillation:
Fractional distillation is the process of separation used mainly to separate liquid mixtures based on difference in boiling points.
Fractional distillation is used only when the difference in boiling points of liquid components is less than 25⁰C.
Ex: Separation of natural gas, kerosene oil…etc from petroleum done by using fractional distillation.

Distillation: Simple distillation also used to seperate the liquid mixtures. But it can be used only when the difference in boiling points of liquid components is greater than 25⁰C.

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Name the factors which decides the movement of materials across the plasma membrane?

Posted by Anwin Saji 7 years, 6 months ago

CBSE > Class 09 > Science