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Assertion (A): Chloroplast has 70S ribosome.

Reason (R): They are descendants of bacteria.

Option: 1

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


Option: 2

Both A and R are true but R is not the correct explanation of A.


Option: 3

A is true but R is false.


Option: 4

A is false but R is true


Answers (1)

best_answer

Two subunits of the 30S and 50S ribosomes combine to form the 70S ribosome. The explanation for this is that chloroplast is a descendant of bacteria. As a result, the 70S ribosome may be found in bacterial cells, mitochondria, and chloroplasts. Hence, option 1 is the correct answer.

Explanation for the incorrect options : 

Option 2 is incorrect because the reason is correctly explaining the assertion.

Option 3 is incorrect because chloroplasts are one of several types of organelles found in plant cells. Endosymbiotic cyanobacteria are thought to have developed into them. Hence reason is true.

Option 4 is incorrect because plant cells include three types of ribosomes: 80 S ribosomes in the cytoplasm, 70 S-like ribosomes in the chloroplasts, and mitochondrial ribosomes. Hence assertion is true.

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Divya Prakash Singh

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