Worksheet: 15 Name: Subject: Grade: 9 Date: Month & Year: January2025 Topic: Transportation in Animals 1.Enzymes are biological catalysts. a.Describe what is meant by a catalyst. ............................................................................................................................................................... ............................................................................................................................................................... ............................................................................................................................................................... ............................................................................................................................................................... b. State the type of biological molecule enzymes are made of. ............................................................................................................................................................... ............................................................................................................................................................... c. The rates of enzyme activity of two different enzymes, A and B, were recorded at different temperatures. Fig. 1.1 shows the results. Page 1 of 4 Compare the effect of temperature on the rate of enzyme activity for enzymes A and B. Use data from Fig. 1.1 to support your answer. ............................................................................................................................................................... ............................................................................................................................................................... ............................................................................................................................................................... ............................................................................................................................................................... ............................................................................................................................................................... ............................................................................................................................................................... ............................................................................................................................................................... ............................................................................................................................................................... d. State one factor, other than temperature, that would affect the rate of enzyme activity ............................................................................................................................................................... ............................................................................................................................................................... e.The box on the left contains the word ‘Enzymes’. The boxes on the right contain some sentence endings. Draw three lines from the box on the left to make three correct sentences. Page 2 of 4 2. Complete the sentences about human teeth. The process of taking food into the mouth is called ............................................... . Flat sharp-edged teeth at the front of the mouth, called ............................................... , are used for biting off pieces of food. The ............................................... and ............................................... are the large teeth towards the back of the mouth that are used for ............................................... the food. b. Fig. 2.1is a diagram of a villus. Draw labels and label lines on Fig. 6.1 to identify a capillary and a lacteal. (ii) State the part of the digestive system where villi are located. ..................................................................................................................................... ....................... (iii) State the function of the lacteal. ............................................................................................................................................................... ............................................................................................................................................................... ............................................................................................................................................................... ............................................................................................................................................................... ............................................................................................................................................................... Page 3 of 4 ............................................................................................................................................................... ............................................................................................................................................................... c. Describe the pathway taken by the products of protein digestion from the villi to the liver. ............................................................................................................................................................... ............................................................................................................................................................... ............................................................................................................................................................... ............................................................................................................................................................... ............................................................................................................................................................... Page 4 of 4
