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Lesson Posted on 18 Apr CBSE/Class 8/Science/Microorganisms: Friends or Foe

Microbiology Introduction

Khatri Geeta Rajesh

I am a dedicated teacher with proven experience in the relevant field. I worked as an educator in reputed...

Microbiology is the study of organisms that can only be seen through the microscope. These living beings are called microorganisms as they can not be seen with eyes alone and they are both friends and enemies of human beings. The major groups of these small living things are- 1. Bacteria 2. Fungi 3.... read more

Microbiology is the study of organisms that can only be seen through the microscope. These living beings are called microorganisms as they can not be seen with eyes alone and they are both friends and enemies of human beings. The major groups of these small living things are-

1. Bacteria

2. Fungi

3. Algae

4. Virus

5. Protozoa

 

Some microorganisms are useful to us while some are infectious causing harm to the plants, animals and humans. They can reduce the harvest and infect the livestock.

Pathogens are the disease causing microorganisms. They can enter the body though air, water or food. The other media of communication are physical contact with an infected person or animal. The diseases caused due to this contact are called communicable diseases. 

The insects and animals that carry the micobes are called carriers

Q. Have you seen a rotten potato?

Q. Can you eat food cooked a few days back that was not refrigerated?

Q. Why do the elders advise to keep a handkerchief on mouth while sneezing?

 

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Asked on 07 Mar CBSE/Class 8/Social Studies/History

What were the motives of British behind partitioning Bengal?

Answer

Lesson Posted on 23/12/2020 Health and Fitness/Yoga/Female tutor CBSE/Class 8/Social Studies/Civics/Indian Constitution CBSE/Class 10/English/CBSE Class 10 English First Flight Poems +1 CBSE/Class 10/Mathematics/UNIT II: Algebra/Quadratic Equations/ Class 10 Relationship between discriminants and nature of roots less

Preparing for Upcoming Board Exams

Tanuja Kandpal

Teaching since 2013. With 100% positive results. This year too my students scored really good in their...

This year is an exceptional case as students cannot learn properly still due to technological advances, we somehow managed to learn a lot through online classes, e-books, etc. You are closer to the time when you will be facing board exams. So, I would like you to get organised and create a revision schedule... read more

This year is an exceptional case as students cannot learn properly still due to technological advances, we somehow managed to learn a lot through online classes, e-books, etc.
You are closer to the time when you will be facing board exams. So, I would like you to get organised and create a revision schedule which can help you study smarter and learn what you don't know, dont revise one thing a lot of times and skip others.
Practice past year papers and get familiar with the question paper layout. Get through your like mock test given online or offline and check where you lost marks.
Do group studies often, explain others, it will help you know yourself.
Last but not least, take care of yourself. Proper food, rest, exercise is also essential. Don't stress too much, talk to your fellow mates, family and friends sometimes.
Good luck!

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Lesson Posted on 27/11/2020 CBSE/Class 8/Maths/Algebraic Expressions And Identities CBSE/Class 8/Maths

Algebraic Expressions and Identities - Key Points to Remember -

Arun Kumar Pai

I come from IT industry background with 20-year professional experience. Have a BSc-Electronics Degree...

Key Points to Remember 1. Algebraic Expressions Algebraic Expressions are formed from Variables and Constants. The expression '2p–5' is formed from the variable 'p' and constants '2' and '5'. The expression '4xy+7' is formed from variables 'x' and 'y' and constants '4' and '7'. Note that the... read more

Key Points to Remember

1. Algebraic Expressions

Algebraic Expressions are formed from Variables and Constants.

The expression '2p–5' is formed from the variable 'p' and constants '2' and '5'. The expression '4xy+7' is formed from variables 'x' and 'y' and constants '4' and '7'.

Note that the value of expression changes in response to a change in the value of any of the variables that are part of the expression.

Thus as 'y' takes on different values, the value of the expression '2y–5' keeps changing.

In general, a Polynomial is an algebraic expression containing one or more terms with non-zero coefficients (with variables having non-negative integers as exponents).

'a+b+c+d', '3xy', '7xyz–10', '2x+3y+7z', etc., are a few examples for polynomials.

A Polynomial containing only one term is also referred to as a Monomial; one containing two terms is also referred to as a Binomial; one containing three terms is also referred to as Trinomial, and so on.

2. Terms, Factors and Coefficients

All (AlgebraicExpressions comprise of one or more Terms added together.

For instance, the algebraic expression '4v+9' is the sum of two 'terms' viz., '4v' and '9'. On the same lines, '8xy+6z-2' is the sum of three terms '8xy', '6z' and '-2' respectively.

Terms themselves are the product of Factors.

So, in the example expression '4v+9' above, the term '4v' is a product of factors '4' and 'v' while the second term '9' is made up of a single factor '9'.

The non-zero numerical factor of a Term is referred to as Coefficient or Numerical Coefficient.

So, in the expression '8xy+6z-2' the coefficient in the term '8xy' is '8', the coefficient in the term '6z' is '6' and the coefficient in the term '-2' is '-2'.

3. Like vs Unlike Terms

Terms that share identical, non-numerical factors between them are referred to as Like Terms. Terms that don't do so are referred to as, Unlike Terms.

Examples:

  • '5x', '10x', and '-23x' all share the same non-numerical factor 'x'. So they are like terms
  • '5yz' and '-4yz' contain identical non-numerical factor 'yz' and so, are like terms
  • Point to note, '7xy' and '-5yx' are like terms too, since xy=yx

In the next part of the lesson, we shall be learning Addition and Subtraction of Polynomials. Ensure the concepts discussed here are well understood before moving on to the next part.

I wish you great learning!

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Lesson Posted on 27/11/2020 Tuition/Class 7 Tuition CBSE/Class 8 CBSE/Class 9 +1 CBSE/Class 10 less

How to Use Mnemonics (for All the School Students)

Sekhar

Hi Students, I am going share one of the mnemonics to memorize social studies and any facts to understand conceptually and retaining it for a more extended period: Sun Shoe Tree Door Knife Vicks Heaven Plate Wine Pen Now you have to divide the paragraphs, for example of history. Divide... read more

Hi Students,

I am going share one of the mnemonics to memorize social studies and any facts to understand conceptually and retaining it for a more extended period:

  1. Sun
  2. Shoe
  3. Tree
  4. Door
  5. Knife
  6. Vicks
  7. Heaven
  8. Plate
  9. Wine
  10. Pen

Now you have to divide the paragraphs, for example of history.

Divide a single paragraph into points. After that, relate each point with a story narrating with the word written above.

For example, if you want to memorize everything about Indus valley civilization, then make points out of a paragraph. Then, for example, take the point number 1 sentence and using the word sun make a story, an example should be awkward so that brain will accept it.

Then try to recall the story with respect to that point, you will easily remember.

Try it!

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Answered on 07/08/2020 CBSE/Class 8/Science/Materials: Metals and Non Metals

How can a material at a certain temperature have all of its molecules at the same energy?

Aswin V T

Professional Tutor with 6 years of experience

In Physics, the temperature is defined as the average kinetic energy of the particles in an object. When particles move more quickly, the temperature is higher, and an object feels warmer. When particles move more slowly, the temperature is lower, and an object feels cooler. All molecules are haven't... read more

In Physics, the temperature is defined as the average kinetic energy of the particles in an object. When particles move more quickly, the temperature is higher, and an object feels warmer. When particles move more slowly, the temperature is lower, and an object feels cooler. All molecules are haven't the same energy. The average energy of the total molecules is taken.

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Answered on 30/05/2020 CBSE/Class 8/Social Studies/Civics/Indian Constitution

Brilliant Academy

Yes, you can.
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Answered on 07/08/2020 CBSE/Class 8/Social Studies/Civics/Law and Social Justice

I am law tutor for ugc net and judiciary how can get student 

Rahul Prasad Sah

Have 4 Year's of Experience in Teaching Math & Physics to class 8 to 12 student's

You can use urbanpro, also you can look for a suitable tutor platform.
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Answered on 29/07/2020 CBSE/Class 8/Science/Friction

Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will... read more
Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why? read less

Shobana S.

Personalized coaching for MATHS, SCIENCE,HINDI subjects.

It is mainly due to the force of friction. Force of friction acts opposite to the applied force. Since the box pushed by Seema is heavy, she has to use more force to overcome the force of friction.
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Answered on 29/07/2020 CBSE/Class 8/Science/Friction

Explain why sliding friction is less than static friction?

Shobana S.

Personalized coaching for MATHS, SCIENCE,HINDI subjects.

When an object starts moving from the state of rest, it is called static friction. The force required to keep the object moving with the same speed is called sliding friction. When the box starts sliding, the contact points on its surface do not get enough time to lock into the contact points on the... read more

When an object starts moving from the state of rest, it is called static friction.

The force required to keep the object moving with the same speed is called sliding friction.

When the box starts sliding, the contact points on its surface do not get enough time to lock into the contact points on the floor. So sliding friction is less than static friction.

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