Question

For Questions numbers 14,15 and 16, Two Statements are given- one labelled Assertion(A) and the other labelled Reason, (R) select the correct answer to these question from the codes (a),(b),(c),and (d) as given below
(A) Both Assertion ( A ) and Reason( R ) are true, and Reason( R ) is Correct explanation of the Assertion ( A ). (B) Both Assertion ( A ) and Reason( R ) are true, and Reason( R ) is not the Correct explanation of the Assertion ( A ). (C) Assertion ( A ) is true but Reason( R ) is false. (D) Assertion ( A ) is false but Reason( R ) is true.



Q14. Assertion: A simple tissue is made up of only one type of cells. Reason: various simple tissue in plants are parenchyma, collenchyma and sclerenchyma.



Q15. Assertion: If a spring is stretched from one side, the size and the shape of the spring changes. Reason: force acting on the spring changes the size and shape of the spring in the direction of application of force.



Q16. Assertion: Air is a mixture. Reason: Air can be separated into its constituents like oxygen and nitrogen etc by the physical process of fractional distillation.
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Answer 1

Explanation:

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Answer 2

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14)

Answer:

B) Both A and R are true but R is not correct explanation of assertion.

Explanation:

A simple permanent tissue is that tissue which is made up of similar permanent cells that carry out the same function or have same structure. Simple permanent tissues are of three types-parenchyma, collenchyma and sclerenchyma.

16)

Air is considered as mixture for the following reasons ;

1. Air can be separated into its components like N2, O2 , Argon and CO2 by the process of fractional distillation of liquid air.

2. Air shows the properties of all the gases present in the atmosphere. 

For example : Oxygen is good Supporter of combustion. Hence air also is good supporter of combustion.

3.Air does not have a fixed formula.

4. Air has a variable composition because air at different places contains different amount of gases.

5. Heat or Light energy is neither absorbed nor released when  air is prepared physical by mixing required amount of gases .

6. Mixture does have fixed boiling Point. It holds good in case of liquid air.