Correct option is A
- Blood is a connective tissue that performs transportation, protection, and regulation in the human body.
- It is composed of plasma, red blood cells (RBCs), white blood cells (WBCs), and platelets.
Blood performs the following essential functions:
Transports oxygen and carbon dioxide (gases) via RBCs.
Transports hormones from endocrine glands to target organs.
Transports waste materials, such as urea and carbon dioxide, to excretory organs.
However, synthesis of starch is a plant-specific function. Plants produce starch via photosynthesis and store it in plastids.
• Plasma (the liquid component of blood) carries nutrients, waste products, hormones, and other dissolved substances.
• RBCs (Erythrocytes) carry oxygen from lungs to tissues and CO₂ back to the lungs.
• WBCs (Leukocytes) play a role in immunity and defense against pathogens.
• Platelets help in blood clotting to prevent excessive bleeding during injury.
• Blood also maintains body temperature and pH balance.