6. De-oxygenated blood from the body flows from the vena cava into the right atrium. Oxygenated blood from the lungs flows from the pulmonary vein into the left atrium.
True
False
7. The sounds made by the heart is due to...
Atrioventricular valves closing as ventricles start to relax and semilunar valves closing as the ventricles start to contract
Atrioventricular valves closing as the ventricles start to contract and semilunar valves opening as the ventricles start to relax
Atrioventricular valves opening as ventricles start to relax and semilunar valves opening as the ventricles start to contract
Atrioventricular valves closing as ventricles start to contract and semilunar valves closing as the ventricles start to relax
Atrioventricular valves opening as the ventricles start to contract and semilunar valves closing as the ventricles start to relax
8. How can we monitor the electrical activity of the heart?
Spirometer
Diastole
Electrocardiograms
Double circulatory system
Sinoatrial node
9. Arteries carry blood away from the heart at low pressure whilst veins carry blood back to the heart at high pressure.
False
True
10. At the arterial end of a capillary, the blood is under high pressure due to the contraction of the heart muscle. This is known as...
Lymphatic system
Hydrostatic pressure
Internal pressure
Water potential
Osmotic pressure
11. As carbon dioxide diffuses into the blood, some of it enters red blood cells and combines with water to form a weak acid called carbonic acid. What is this process catalysed by?
Hydrogencarbonate ions
Carbonic anhydrase
Hydrogen ions
Haemoglobin
Water
12. What is found in a layer between the xylem and phloem?
Endodermis
Medulla
Cambium
Vascular tissue
Vascular bundles
13. When more carbon dioxide is present, haemoglobin is less saturated with oxygen. This makes the oxyhaemoglobin dissociation curve shift downwards and to the right, known as the Bohr shift.
True
False
14. Phloem consists of two types of cell known as...
Sieve tube elements and companion cells
Companion cells and plasmodesmata
Sieve tube elements and meristem cells
Plasmodesmata and sieve tube elements
Companion cells and meristem cells
15. A piece of apparatus called a potometer can be used to...
Estimate the water vapour potential gradient
Calculate the rate of osmosis
Accurately calculate the rate of water loss
Estimate the rate of water loss.
Estimate the water potential gradient
16. When water takes the apoplast pathway between cells, it moves through the spaces between cells and does not pass through any plasma membranes.
True
False
17. Sucrose is used in the cells surrounding the phloem at the...
Root
Sink
Sieve tube elements
Leaf
Source
18. Xerophytes have a thin cuticle on the leaves to increase the rate of evaporation.
False
True
19. Oxygen passes from the air in the alveoli to the blood in the capillaries. Carbon dioxide passes from the blood to the air in the alveoli.
