The following diagrams show two magnets near one another.use the word,'Attract, Repel,Turn around' to describe what happens in each case.

Read the following paragraph carefully and answer the following: Tie a stone to one end of a string. Take the other end in your hand and rotate the string so that the stone moves along a circle. As long as we are holding the string, we are pulling the stone towards us i.e. towards the centre of the circle and are appliying a force towards it. The force stops acting on it if we release the string. In this case, the stone will fly off along a straight line which is the tangent to the circle at the position of the stone when the string is released, because that the directionn of its velocity at that instant of time. You may recall a similar activity in which a 5 rupee coin kept on a rotating circular disc flies off the disc along the tangent to the disc. Thus, a force acts on any object moving along a circle and it is directed towards the centre of the circle. This is called the Centripetal force. What is centripetal force?

Read the following paragraph carefully and answer the following: Tie a stone to one end of a string. Take the other end in your hand and rotate the string so that the stone moves along a circle. As long as we are holding the string, we are pulling the stone towards us i.e. towards the centre of the circle and are appliying a force towards it. The force stops acting on it if we release the string. In this case, the stone will fly off along a straight line which is the tangent to the circle at the position of the stone when the string is released, because that the directionn of its velocity at that instant of time. You may recall a similar activity in which a 5 rupee coin kept on a rotating circular disc flies off the disc along the tangent to the disc. Thus, a force acts on any object moving along a circle and it is directed towards the centre of the circle. This is called the Centripetal force. What happens if the string is released?

Give one example in each case that happens around you Desirable and undesirabke change

The following questions consist of two statements, one labelled assertion and the another labelled reason. Select the correct answer from the codes given below: Assertion : conducting tissues, especially xylem show greatest reduction in submerged hydrophytes. Reason: Hydrophytes live in water. So no need of tissues.

Give one example for each case that happens around you. Slow and fast change.

Give one example for each case that happens around you. Reversible and irreversible change.

These questions consists of two statements each printed as Assertion and Reason. Choose any one of the following response to answer these questions. Both Assertion and Reasort are true and Reason is correct explanation of Assertion.Both Assertion and Reason are true but Reason is not correct explanation of Assertion . Assertion is true but Reason is false Both Assertion and Reason are false: Assertion : During primer extension, the PCR mixture is heated to 75^@C to extend each primer by copying the single stranded template. Reason : The primary template synthesis DNA by using Taq-polymerase.

These questions consists of two statements each printed as Assertion and Reason. Choose any one of the following response to answer these questions. Both Assertion and Reasort are true and Reason is correct explanation of Assertion.Both Assertion and Reason are true but Reason is not correct explanation of Assertion . Assertion is true but Reason is false Both Assertion and Reason are false: Assertion : PCR can detect sex linked isordersin fertilized embryos. Reason :Inherited disease isidentified using chorionic villisamples or cellsfrom amniocentesis.

These questions consists of two statements each printed as Assertion and Reason. Choose any one of the following response to answer these questions. Both Assertion and Reasort are true and Reason is correct explanation of Assertion.Both Assertion and Reason are true but Reason is not correct explanation of Assertion . Assertion is true but Reason is false Both Assertion and Reason are false: Assertion: In gene therapy, normal gene istransferred into person’s cellsthat carries mutant alleles by using a vector J2 Reason : When normal gene is expressed, it results in a functional gene & product which produces a normal phe- 2 notype.

Give one example in each case that happens around you: Slow and fast change.