The diagram shows a pea seed beginning to germinate in a jar. Cotton wool at the bottom is moist, and the jar is kept at 22 degrees C. The seed coat splits,...
Question 1 Report
The diagram shows a pea seed beginning to germinate in a jar. Cotton wool at the bottom is moist, and the jar is kept at 22 degrees C. The seed coat splits, a root grows down and a shoot grows up. At this stage there are no green leaves to make glucose by photosynthesis. The embryo uses stored food in the cotyledons. A second jar is kept in a refrigerator, while a third jar contains dry cotton wool. The student checks how many seeds germinate in each jar.
(a) Identify the structure that develops into the first root. [1]
(b) Explain why the seed needs water before germination can begin. [2]
(c) Which condition is tested by placing seeds in a refrigerator? [1]
(d) Identify the process that releases energy from stored food in the embryo. [1]
Answer Details
(a) Radicle [1]
(b) Water is absorbed by the seed [1]; it activates enzymes / allows stored food to be broken down and used [1].
(c) Temperature [1]
(d) Respiration [1].
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