Section A: Mulitple Choice Questions

1. Which of the following statements is incorrect?

A. Plasma protein in the plasma helps the control of tissue fluid volume.
B. The useful materials from the plasma diffuses into the cells through the selective permeable capillary wall.
C. The passing out of the plasma from capillary depends on the difference of osmotic pressure and hydrostatic pressure.
D. Tissue fluid serves as a bridge for the exchange of materials between the blood and cells.

2. Which of the following statements is incorrect?

A. Haemoglobin is a conjugated proteins. One haemoglobin molecule has one haem group.
B. The haem group of haemoglobin comprise a porphyrin ring containing an iron ion.
C. One haemoglobin molecule can carry up to four oxygen molecules.
D. The carrying capacity of haemoglobin can be affected by the partial pressure of oxygen in the surroundings.

3. Which of the following structure is responsible for the initiation of heartbeat?

A. Sinoatrial node
B. Atrio-ventricular node
C. Cardiac muscle of the heart
D. Cardiovascular control centre of the medulla

4. Which of the following statements is incorrect?

A. When muscle contracts, length of A band does not change.
B. When muscle contracts, length of I band is shortened.
C. When muscle contracts, length of H zone remains unchanged.
D. When muscle contracts, the length of one sacromere is shortened.

5. Which of the following statements is incorrect?

A. Casparian strip is a layer with waxy substance.
B. Casparian strip can be found in the root only.
C. Casparian strip is found in the endodermis.
D. Casparian strip is non-living and is made of dead cells.

Section B: Questions

6. What are the three pathways that water move across the root?

7. What is open circulation system?

8. Briefly describe how the effectors control blood pressure.

9. Explain the role of calcium ions in muscle contraction.

10. Describe the mass flow hypothesis.