Weekly Quiz 1 - Grade 10
Quiz by Arjumand Hasan Nahdi
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20 questions
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- Q1A bacterium is 0.5 μm long. A student makes a drawing of the bacterium. The student’s drawing is 100 mm long. What is the magnification of the student’s drawing?×0.005×200 000×50×20060s
- Q2Red blood cells were placed in pure water. Movement of water across the cell membrane caused a change in their appearance. What caused this change in appearance?DCAB60s
- Q3The diagram shows a root hair cell. Why does a root hair cell contain a large number of mitochondria?to provide energy for the absorption of water from the soilto provide energy for osmosisto provide energy for the diffusion of mineral ions from the soilto provide energy for the active transport of mineral ions from the soil60s
- Q4Enzyme X digests protein in the stomach. Four test-tubes were set up, each contained the same amounts of protein and enzyme X. The test-tubes are kept at different levels of pH and temperature, as shown in the table. In which test-tube will protein digestion be quickest?CDBA60s
- Q5The pie charts show the composition of 100 g of four different foods. Which food provides the most energy?ABDC60s
- Q6The diagram shows the effect of an enzyme working in the human digestive system. What would reduce the rate of production of amino acids?removing the amino acids as they are formedraising the temperature to 37.1 °Cincreasing the amount of proteinraising the pH to 7.560s
- Q7The diagram shows part of a plant root in the soil. The root is absorbing water. At which labelled point is the water potential highest?ABDC60s
- Q8One strand of a DNA molecule contains the base sequence AGT. What is the base sequence on the other strand of the DNA molecule?TACGATAGTTCA60s
- Q9Which process is involved in the uptake of glucose by the epithelial cells of kidney tubules?active transporttranspirationosmosisdiffusion60s
- Q10The graph shows how an enzyme-controlled reaction is affected by temperature Which statement explains the change in activity between X and Y?There is more substrate present.There are more effective collisions.The kinetic energy of the molecules has increasedThere is a change in the enzyme shape.60s
- Q11Discs of raw potato tissue are weighed (initial mass). They are then placed in sucrose solutions of different concentrations. After one hour their masses are measured again (final mass). The graph shows how the ratio of initial mass :final mass changes with concentration of sucrose solution. Which concentration of sucrose solution has the same water potential as that of the cells in the potato discs?0.1 mol per dm30.3 mol per dm30.4 mol per dm30.5 mol per dm360s
- Q12The diagram shows some cells in the root of a plant that is absorbing water from the soil. How does the water potential of the cell marked 2 differ from the water potentials of the cells marked 1 and 3?lower than cell 1 and higher than cell 3higher than cell 1 and lower than cell 3higher than cell 1 and higher than cell 3lower than cell 1 and lower than cell 360s
- Q13Some organisms live at the bottom of the sea where it is very dark. To synthesise glucose, they use energy from chemicals in the very hot water that comes out of volcanoes. What is a distinguishing feature of these organisms?Their enzymes are easily denatured by heat.They do not need to be green.They obtain energy only as carnivores.They do not need carbon dioxide.60s
- Q14In an enzyme’s action, where is the active site and where are the lock and the key?DCAB60s
- Q15Which symptom of malnutrition can be treated by an increased amount of protein in the diet?constipationheart diseaseobesitystunted growth60s
