2018年6月6日星期三

suggested answer (2018-06-06)



Biology Test
Date:2018-06-06
Class: ___________(    )             Name: ____________    Mark: _________

Section I: 30%
1. List the functions of different types of teeth:
  (i) incisor: biting and cutting the food
   (ii) canine:  tearing flesh
   (iii) molar:  crushing and grinding the food
2. Finish the following table to show the chemical digestion:
Digestive glands
Digestive juices
Enzymes involved
Site of Action
Functions(actions) of the enzyme(s)
Saliva
Saliva
Salivary amylase
Mouth cavity
Starch - > maltose
Gastric gland
Gastric juice
pepsin
Stomach
Protein ->peptides
Pancreas
Pancreatic juice
Pancreatic amylase
Pancreatic proteases
lipase
Duodenum
Starch -> maltose

Protein->peptides
->amino acid
Intestinal glands
Intestinal  juice
Carbohydrases
proteases
ileum
Disaccharides -> monosachharides

Section II: 70%
1. Fill in the blanks to show the relationship between the features and functions:
Structures
Related features
Functions
Enamel
Hard / made up of calcium salts
Protect the tooth from wearing
Pulp cavity
Contain blood vessels
Provide nutrient and oxygen to the tooth
Stomach
Contain hydrochloric acid
Kill bacteria in the food
Wall of alimentary canal
Contain mucus
Prevent the wall from digestion by proteases
2. List the name(s) of the digestive juices related to the digestion of starch.
Saliva, pancreatic juice


3. List the name(s) of the digestive glands related to the digestion of protein.
Gastric gland, pancreas, intestinal gland
4. List the site(s) in the alimentary canal where proteins are digested
Stomach, duodenum, ileum
5. List the site(s) in the alimentary canal where carbohydrates are digested
Mouth cavity, duodenum                                                                                                 
6. List the site in the alimentary canal where protein begin to be digested
stomach 
7. List the site in the alimentary canal where starch begin to be digested
Mouth cavity
8. List the site in the alimentary canal where lipids begin to be digested
Duodenum
9. State the function of bile salt to digestion:  
Emulsify the large oil droplets to  smaller ones to increase the surface areas for the action of lipase
10  A cell belongs to a living thing, should have all living characteristics. Fill in the         blanks below to show the relationship between the structures and the living      characteristics.
Structures
Functions
Related living characteristics
Mitochondrion
Break down food to provide energy
Respiration
Chloroplast
Carry out photosynthesis
Nutrition
Vacuole
Collect metabolic wastes in plant cells
excretion
11. Explain the reason why taking in too much rice will lead to overweight.
Rice contain starch. Starch is carbohydrate. If taking in too much carbohydrate, the excessive carbohydrate will change into lipid. The lipid will be stored under the skin to make us overweight.
12. How to prove the presence of vitamin C in orange juice?
  Add the orange juice solution into the DCPIP with fixed volume, if the colour of the DCPIP change from deep blue to orange the orange juice solution contains vitamin C.
13. State the effect on digestion if the gall bladder is cut.
   Bile is stored in the gall gladder, if the gall bladder is cut, less bile will be secreted to the duodenum. As a result, less lipid will be emulsified. The digestion of lipid will become less.
14. List any 5 types of substances that are present in the faeces.
   Unabsorbed substances, undigested substances, dietary fibre, mucus, bacteria from the gut, digestive enzymes, water, bile pigment, cells from the gut wall, remaining hydrochloric acid, remaining hydrogencarbonate….
   Any 5

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