YEAR 9 BIO END OF SEMESTER 1 EXAM

YEAR 9 BIOLOGY END OF SEMESTER 1 EXAM 1.Kylie investigates the importance of the elements contained in mineral salts for plants. Here are her results. (a) The first plant in the table was given all the mineral salts. Why did Kylie include a plant that was given all the mineral salts in her investigation? (2) (b) Kylie records her results by drawing a picture of each plant. What one measurement could she take to improve her results? (2) (c) Interpret the results for the following three plants. (i) The plant given all the mineral salts without nitrogen looks ………………………………because nitrogen is needed for……………………………….. (2) (ii) The plant given all the mineral salts without phosphorus is…………………… because phosphorous is needed for………………………………………………. (2) (iii) The plant given all the mineral salts without magnesium……………………………………….. is because magnesium is needed for …………………………….. (2)

2. Hummingbirds feed on cactus flowers. (a) Cactus plants live in very dry areas. They have special adaptations to this habitat. Describe two of these adaptations and explain how they help the cactus plant to survive. (4) Adaptation 1 …………………………………………………………………………………………………………………… How it helps…………………………………………………………………………………………………………………. Adaptation 2…………………………………………………………………………………………………………………. How it helps …………………………………………………………………………………………………………….. (b) Hummingbirds are adapted to feed on cactus flowers. Describe one adaptation and explain how it helps the hummingbird to feed. (2) Adaptation………………………………………………………………………………………………………………………………. How it helps……………………………………………………………………………………………………………………………… 3.Define the following terms. (4) a) species b) photosynthesis c)sampling

4.Draw a well labelled diagram of a flower. (5) 5.List two methods of sampling. (2) 6.Haymthan found a plant that had leaves with some green areas and some white areas. He decided to test one of the leaves for starch. He made this prediction. a) What is the substance that makes plants green. (1) b) What is the function of the substance you have named above. (2) c)Explain why Haymthan’s prediction is likely to be correct. (2) d) First, Haymthan placed the leaf in boiling water, and left it there for 5 minutes. Explain why he did this. (2)

e) Next, he took the leaf out of the water and put it into some hot alcohol. Explain why he did this. (2) 7. Write a word equation for the process of photosynthesis. (2) 8. (a) The boxes show some parts of plants and the function of the parts. Draw a line from each part to match its function. (4) 9. Plants and green algae need mineral salts to grow. One mineral salt is magnesium sulfate. Ahmed and Safia investigate the growth of algae. They put different concentrations of magnesium sulfate solution into five flasks, A, B, C, D and E. They then add the algae.

(a) Why did Ahmed and Safia put 10 cm3 of algae into each flask? (2) (b) Why did they leave the flasks for 5 days? (2) (c) Here are their results. Complete the sentence to describe the pattern of their results. As the concentration of magnesium sulfate increases from 1 to 5, the colour of the algae …………………………………………… (2) (d) When the colour of the algae is dark green it has grown the most. Complete the sentence. Choose a word from the list. carbon dioxide fastest the same slowest sugar water

When the concentration of magnesium sulfate is 4 the algae grow…………………………(1) 10. Define ecology. (1)