CE Biology: MC knowledge

1.Female sex hormone can maintain pregnancy.
2.Cotyledons in seeds do not carry out photosynthesis.
3.Small mammals have bigger surface area to volume ratio so that more heat is lost.
4.Sweat gland can only be found in mammal.
5.Concentration of urea and salt in glomerular filtrate is the same as plasma.
6.The highest concentration in glomerular filtrate is sodium chloride not urea.
7.Vertebral column consist of many small bone to enable body to bend.
8.Axon presents in the central nervous system are non-myelinated.
9.Both red blood cell and plasma involve in transportation of carbon dioxide towards the lung.
10.Calcium, which can be removed by sodium oxalate in solution, takes parts in blood clotting.
11.Double circulation maintain higher blood pressure and prevent the mixing of oxygenated and deoxygenated blood.
12.Canine absents in some mammals.
13.The widespread distribution of veins give mechanical support to the flattened blade of the leaf.
14.The vascular bundles of a dicotyledonous root are usually presence at the central core to provide better anchoring effect to act against the uprooting stress of wind or by-passing animals.
15.The vascular bundles of a dicotyledonous stem are usually presence along the periphery to provide better strengthening effect to act against the bending stress of wind.
16.At night, the accumulation of carbon dioxide stimulate sugar in the guard cell changing to starch thereby raise the water potential there and causing water to be drawn to be drawn to the surrounding which cause the stomata to close.
17.Each time before the level of the coloured water in the graduated U glass tube is measured, the leveling arm has to be moved up and down until the water levels in both the leveling arm are the same. This is to ensure that each time the volume of the gas trapped in the sample chamber is measured under the same pressure.
18.Contour ploughing prevents gully erosion.
19.Warm water decrease the solubility of gases and this make less oxygen available in water.this may lead to suffocation of certain aerobic life.
20.Carbon dioxide can be utilized by aquatic animals to combine with calcium for the formation of calcareous shells.
21.Bacteria carry out sexual reproduction conjugation.

Special thanks to Y.K.To, author of Complete Multiple choice Biology