Available Answers

1. 1.

   Why is the colour of blood red?

2. 2.

   What will happen if the oxygenated blood and deoxygenated blood mix with each other?

3. 3.

   What will happen, if water is lost through transpiration more quickly than it is absorbed by the root hair?

4. 4.

   Check point:

   1. Blood cells that protect the body from diseases are
      1. WBCs
      2. RBCs
      3. Platelets
      4. None of these
   2. Blood cells which transport oxygen are
      1. WBCs
      2. RBCs
      3. Platelets
      4. All of these
   3. The thinnest blood vessels in the human body are
      1. Arteries
      2. Veins
      3. Capillaries
      4. None of these
   4. Human heart is
      1. Two-chambered
      2. Three-chambered
      3. Four-chambered
      4. Five-chambered
   5. In plants, water is transported through
      1. Stomata
      2. Root hair
      3. Xylem
      4. Phloem
   6. Transpiration helps in
      1. Circulation of blood
      2. Translocation of food
      3. Removal of excess water
      4. Transportation of water
5. 5.

   True-False:

   1. Heart muscles are called cardiac muscles.
   2. Plants lose water by the process called transpiration.
   3. Haemoglobin combines with oxygen to form carboxyhaemoglobin.
   4. Food prepared by leaves is translocated by phloem.
   5. Kidneys act as filters to remove waste from the body.
   6. Impure blood from different parts of the body returns to the left atrium.
   7. In a healthy person, heartbeat rate is 78 times per minute.
6. 6.

   Fill in the blanks:

   1. Haemoglobin is present in _______________ cells.
   2. The rhythmic expansion and contraction of the heart is called _______________.
   3. The urine contains water and _______________.
   4. Oxygenated blood is found on the _______________ side of the heart.
   5. The four chambers of the heart are two _______________ and two _______________.
   6. If kidneys are damaged, doctors remove wastes from the body by _______________.
   7. Kidneys eliminate the waste materials in the liquid form called _______________.