Question

assertion based question for chapter - the fundamental unit of cell

for class 9

please give correct answer only

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Answer 1

Answer:

Assertion: Cell is the fundamental structural and functional unit of all living organisms.

Reason: Anything less than a complete structure of a cell does not ensure independent living."

A

If both assertion and reason are true and the reason is the correct explanation of the assertion

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Answer

A

Solution

Cell is the fundamental structural and functional unit of all living organisma because anything less than a complete structure of a cell does not ensure independent living.

Answer 2

Question

The following questions consist of two statements -A(Assertion) and R (Reason)

Answer the question selecting the appropriate option given as follow:

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true and R is not the correct explanation of A.

(c) A is true but R is false.

(d) A is false but R is true.

Explanation:

(a.) A (Assertion):  Alloy is considered as a mixture.

• It is true.

     R (Reason): Refining of petroleum involves fractional distillation.

• This is also true but it is not the proper explanation of A.

    So, (b) Both A and R are true and R is not the correct explanation of A.

(b) A (Assertion): A solution is a homogeneous mixture of two or more substances.

• It is true.

    R (Reason): A solution scatters a beam of light passing through it.

• IT is also true and the correct explanation of assertion.

  So, (a) Both A and R are true and R is the correct explanation of A.

(c) A (Assertion): Pure substance in which molecules made up

    B (Reason): Hydrogen, Oxygen and nitrogen and elements.

   This question is incomplete.

   Pure substance is a substance in which only one kind of molecule is present.