Question

Assertion Reason type questions
Question number 1 to 5 are are Assertion(A)-Reason(R) type questions. In each of the following question a statement of Assertion is given by the corresponding statement of Reason.

Mark the correct answer as-

(a)lf both assertion and reason are true and reason is correct explanation of assertion
(b)Both assertion and reason are true but reason is not the correct explanation of assertion
(c) Assertion is true but reason is false
(d) Assertion is false but reason is true
(e) Both assertion and reason are false

Q1. (A) Robert brown discovered nucleus
(R) Nucleoplasm And Cytoplasm Of A Living Cell Together Form The Cytoplasm

Q2. (A) Lysosomes are often called as suicidal bags of a cell
(R) Lysosomes contain hydrolytic enzymes capable of digesting cellular waste

Q3. (A) Displacement of body may be zero even when distance is not zero
(R) Displacement and distance both are scalar quantities

Q4. (A) Speed of a body is distance travelled in unit time
(R) Speed is always equal or greater than velocity

Q5. (A) The position time graph of an object in uniform motion is a straight line
(R) Uniform motion object covers equal distance in equal interval of time.​​​​

Answer 1

a) =Robert Brown discovered the cell - is a false statement.

The first person to see a cell was Robert Hook. He used a very primitive microscope and observed empty blocks like structure in the cork cells which was named as cell.

b) =Lysosomes are known as suicide bags of the cell because they contain lytic enzymes capable of digesting cells and unwanted materials. autolysis and burst open when the cell is damaged. ... The released enzymes then digest their own cell, causing the cell to die. As a result, they're known as cell suicide bags.

c) =The displacement is the shortest distance between initial and final position. When final position of a body coincides with its initial position, displacement is zero, but the distance traveled is not zero . Hence ,the correct option is

d) =Speed is the distance travelled by a moving body per unit time

e) =option

An object is said to be in uniform motion, when it covers equal distances in equal intervals of time. Here option A is correct as the graph is a linear one.

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