COMMAND WORD · BIOLOGY
Give the reason that makes a statement already in the question follow, and give only as many reasons as were asked for.
The statement is true because of this reason.
Original question
The atrioventricular valve closes when the ventricle contracts. Give one reason.
Annotated answer
StatementThe valve closes. BecauseVentricular pressure rises above atrial pressure, so the valve is pushed shut. NumberOne reason is enough. The rest of the cardiac cycle is not added.
The labels match the frame. Read them in order. This is one accurate route, not the only one.
Repeating the statement is not a reason.
Writing “the valve closes during systole” and stopping.
Based on a sample question
Mark points shown after marking
In an investigation of mass flow in phloem, students estimated the cross-sectional area of the sieve tubes, rather than the area of the whole phloem tissue. Give a reason why.
(1)Total for this question: 1 mark
The estimate is of the path the contents flow through. Tissue around that path is not the same area. “Because the method says so” repeats the step and does not justify it.
Unit 2 sample paper. Question 5 (c) asks for a reason why sieve-tube area was estimated rather than the whole phloem tissue. Sample assessment, not a live paper.
Sample paper WBI12/01, question 5 (c) (1 marks), 2017 sample assessment. Question page · Mark scheme page
