NCERT Solutions for Class 7 Science Chapter 11
Important NCERT Questions
7th Chapter 11 Transportation in Animals and Plants
NCERT Books for Session 2022-2023
CBSE Board and State Board
Questions No: 10
What makes the blood look red?
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The presence of haemoglobin makes blood appear red.
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Blood looks red due to red blood cells (RBCs) containing a molecule called hemoglobin. Hemoglobin carries oxygen, binding with it to form oxyhemoglobin, giving blood its bright red color. When RBCs release oxygen in tissues, it forms deoxyhemoglobin, making blood appear darker red or bluish in veins. The red hue varies based on oxygen levels: oxygen-rich blood appears bright red, while oxygen-poor blood looks darker. Hemoglobin’s role in carrying oxygen gives blood its distinct red color.