Science 9 · Unit 7: Genes and inheritance · Cambridge Lower Secondary Science Stage 9

Questions

1. 1. What word describes differences between individuals of the same species?

   • variation
   • adaptation
   • frequency
   • features
   Check

2. 2. Which is an example of discontinuous variation?

   • flower colour
   • height
   • body mass
   • leaf length
   Check

3. 3. Which is an example of continuous variation?

   • leaf length
   • eye colour
   • blood group
   • flower colour
   Check

4. 4. Variation can be caused by genes. What else can cause it?

   • the species name
   • nothing else
   • the environment
   • the number of cells
   Check

5. 📖 This question is about a text that students read in the app.

   5. How many yellow canna plants did Arun and Marcus count?

   • 7
   • 5
   • 3
   • 6
   Check

6. 📖 This question is about a text that students read in the app.

   6. How many orange canna plants did Arun and Marcus count?

   • 2
   • 7
   • 6
   • 5
   Check

7. 📖 This question is about a text that students read in the app.

   7. How many canna plants are there in total?

   • 16
   • 20
   • 22
   • 18
   Check

8. 8. Which kind of graph should show the number of canna plants of each colour?

   • a bar chart, with spaces between the bars
   • a line graph
   • a frequency diagram with no gaps
   • a pie chart with no labels
   Check

9. 9. Sofia counts the prickles on each of the 18 holly leaves in a photograph. How should she work out the mean number of prickles on a leaf?

   • Choose the number of prickles that appears most often.
   • Add up the prickles on all 18 leaves, then divide by 2.
   • Count the prickles on the biggest leaf only.
   • Add up the prickles on all 18 leaves, then divide by 18.
   Check

10. 10. Sofia draws a frequency diagram of the number of prickles on her holly leaves. What goes on the vertical axis?

    • number of prickles
    • number of leaves (frequency)
    • leaf colour
    • leaf length
    Check

11. 11. Which other feature shows variation in holly leaves?

    • leaf length
    • having cells
    • belonging to holly
    • being a leaf
    Check

12. 12. Which features of pea pods could show variation?

    • the number of chromosomes in a cell
    • the name of the plant
    • being a pod, having seeds, being a plant
    • pod length, number of peas and pod colour
    Check

13. 13. Which feature of the pea pods could you assess by counting?

    • the shape of each pea
    • whether the pod is open
    • the colour of each pod
    • the number of peas in each pod
    Check

14. 14. Why do measurements like pea pod length need grouping into categories for a frequency diagram?

    • There are so many different values.
    • Pod lengths are colours.
    • There are only two values.
    • Bar charts can't show numbers.
    Check

15. 15. How many categories should you group pea pod results into for a frequency diagram?

    • exactly two
    • exactly one
    • at least four, but no more than ten
    • more than twenty
    Check