Question

Statement 1: Human red blood cells are circular and biconcave.
Statement 2: Mitochondria and chloroplast are the results of a symbiotic association of bacteria with primitive pre-eukaryotic cells.

• A. Both the statements are false
• B. Both the statements are true
• C. Only statement 1 is true
• D. Only statement 2 is true

Answer 1

The correct option is B

Both the statements are true

Human red blood cells are circular and biconcave, for easy passage through capillaries and to transport oxygen.

The similarity of the genomes to mitochondria and chloroplast to those of bacteria and the close resemblance of some of their proteins to bacterial proteins strongly suggest that both these organelles evolved from bacteria that were engulfed by primitive pre-eukaryotic cells with which they initially lived in symbiosis.