Question 6
Section B: answer in the spaces provided. Printed total 40 marks and 50 minutes are confirmed by the supplied key. Four points per parent question and subpart allocations are editorial; no individual scores are printed.
Mark put soil in a glass jar, added water, covered it and left it on a table for several weeks. A green substance grew on the jar wall. He wrote, “The soil may contain some algae.” Under a microscope he found microorganisms with chloroplasts. Comparing their shapes with book pictures, he found some were Chlorella.
Use these keywords: generalization; method; calculation; hypothesis; conclusion; observation.
(a) “The soil may contain some algae” is a ______.
(b) Examining the green substance under a microscope and finding organisms with chloroplasts is ______.
(c) Identifying some organisms as Chlorella is a ______.
Mark put soil in a glass jar, added water, covered it and left it on a table for several weeks. A green substance grew on the jar wall. He wrote, “The soil may contain some algae.” Under a microscope he found microorganisms with chloroplasts. Comparing their shapes with book pictures, he found some were Chlorella.
Use these keywords: generalization; method; calculation; hypothesis; conclusion; observation.
(a) “The soil may contain some algae” is a ______.
(b) Examining the green substance under a microscope and finding organisms with chloroplasts is ______.
(c) Identifying some organisms as Chlorella is a ______.