What are the answers to the following biology questions about blood vessels, breathing, root structures, and cell division?

Here are the answers to your questions:

21. Name the blood vessel with the highest concentration of:

    • i) Carbon (IV) oxide: Pulmonary artery or Vena cava
    • ii) Glucose: Hepatic portal vein
    • iii) Oxygen: Pulmonary vein or Aorta

22. List three factors affecting breathing rate in human beings:

    • i) Concentration of carbon dioxide in the blood
    • ii) Level of physical activity (exercise)
    • iii) Body temperature

23. The diagram below shows a longitudinal section of a root:

    • a) Give one adaptation of the part labeled A to its function. Part A represents the root hair zone. Its adaptation is having numerous root hairs, which greatly increase the surface area for efficient absorption of water and mineral salts.
    • b) Give two functions of part labeled D. Part D represents the root cap.
      • i) It protects the delicate meristematic cells of the root tip from damage as the root grows through the soil.
      • ii) It secretes mucilage to lubricate the root tip, making it easier to penetrate the soil.

24. During cell division the following processes take place.

    • a) Name the phase when chromosomes arrange at the center. Metaphase
    • b) Name the phase when sister chromatids separate. Anaphase