IB Biology SL Theme B: Form and function questions

Exam-style multiple choice and written questions with full markschemes. Check multiple choice answers straight away, or type, photograph or draw a written answer and get it marked.

Type
Multiple choiceWritten
Difficulty
EasyMediumHard

Question 1

Paper 2Easy6 marks

A student exposes equal samples of the same enzyme to different conditions for 10 minutes. The student then measures the activity of each sample at pH 7 and 25 °C.

Conditions during exposureRelative enzyme activity afterwards (% of untreated control)
pH 7, 25 °C (untreated control)100
pH 7, 80 °C8
pH 2, 25 °C12
(a)

State three features of polypeptide chains that allow a wide variety of polypeptides to exist.

[3]
(b)

Use the results in the table.

(i)

Identify the exposure condition that resulted in the lowest enzyme activity.

[1]
(ii)

State the term for the change in protein structure that can be caused by high temperature or extreme pH, and state one effect of this change on enzyme function.

[2]

Question 2

Paper 2Easy2 marks

A student uses a spirometer to measure the volume of air exhaled during three normal breaths.

BreathVolume of air exhaled / dm³
10.46
20.50
30.54
(a)

Determine the mean tidal volume.

[1]
(b)

State one change in the diaphragm during inspiration.

[1]

Question 3

Paper 2Easy5 marks

A field team records five plant forms in a tropical forest.

PlantObservation
PA tree grows until its crown reaches the canopy.
QA woody vine rooted in the soil climbs a tree trunk.
RA plant grows on a branch of a tree.
SAn epiphyte grows on a host tree and later surrounds its trunk.
TA small herb grows on the shaded forest floor.
(a)

Identify the plant forms represented by Q and R.

[2]
(b)

Identify the plant forms or strategies represented by P, S and T.

[3]

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