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Assertion : Mitochondria and chloroplast...

Assertion : Mitochondria and chloroplasts are semiautonomous organelles.
Reason : They are formed by division of pre-existing organelles as well as contain DNA but lack protein synthesizing machinery

A

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

B

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

C

If the assertion is true but the reason if false

D

If both the assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
C
Mitochondria and chloroplasts both are double membrane organelles. They are semi autonomous as both their structure and functions are partially controlled by nucleus of the cell and partially themselves. Both possess their own DNA and arises from pre-existing cells. Synthesis of many amino acids are glutamic acid and aspartic acid.
Also plastid manufactures some of its own proteins, enzymes and other chemicals because of the presence of 70s ribosomes which can help translate the coded information contained in mRNAs transcribed over chloroplast DNA.
DNA replication is the process of forming carbon copy of DNA. Whereas transcription is the formation of RNA over DNA template.
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Read the given statements and select the correct option. Statement 1 : Chloroplast and mitochondria are semiautonomous bondies. Statement 2 : Chloroplast and mitochondria have their own DNA and protein synthesising machinery.

Assertion: Chloroplasts are known as semiautonomus cell organelle. Reason: Chloroplast has lipoprotein membrane.

Knowledge Check

  • Mitochondria and chloroplast are A. Semi-autonomous organelles B. Formed by division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery Which one of the following options is correct?

    A
    Both (A) and (B) are correct
    B
    (B) is true but (A) is false
    C
    (A) is true but (B) is false
    D
    Both(A) and (B) are false

  • Mitochondria and chloroplast are (a) Semi-autonomous organelles (b) Formed by division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery Which one of the following options is correct

    A
    Both (a) and (b) are correct
    B
    (b) is true but (a) is false
    C
    (a) is true but (b) is false
    D
    Both (a) and (b) are false

  • Assertion. Mitochondria and chloroplasts are semiautonomous argenelles. Reason. They contain ribosomes, DNA and RNAs and can synthesize some of their proteins.

    A
    If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
    B
    If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
    C
    If Assertion is true but Reason is false.
    D
    If both Assertion and Reason are false.

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    Assertion . Mitochondria and chloroplasts have their own genome Reason . Endoplasmic reticulum and Golgi body are the cell organelles which have their own DNA

    Assertion. Ribosomes and DNA of the chloroplasts resemble those of prokaryotes. Reason. The same is true of these organelles present in the mitochondria.

    Assertion: Spores in mosses are contained within the capsule. Reason: Spores are formed by mitotic division in mosses.

    Assertion:Mitochondria are believed to originate by growth and division of previously existing ones . Reason:They contain DNA and Ribosomes

    Assertion : The cells that have membrane bound organelles are called eukaryotic. Reason : The cells that lack membrane bound organelles are called prokaryotic.

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