IB Questionbank

User interface language: English | Español

Date	May 2019	Marks available	1	Reference code	19M.1.SL.TZ1.12
Level	Standard level	Paper	Paper 1	Time zone	Time zone 1
Command term	Deduce	Question number	12	Adapted from	N/A

Question

The graph shows the effect of increasing light intensity on the rate of CO₂ uptake by a species of green plant maintained in conditions of constant temperature and CO₂ concentration.

[Source: © International Baccalaureate Organization 2019]

Which statement is consistent with the graph?

A. Photosynthesis stops at high light intensity.

B. Rates of photosynthesis increase with temperature.

C. Cell respiration leads to net production of CO₂ at low light intensity.

D. There is a negative correlation between CO₂ uptake and light intensity.

Markscheme

Examiners report

Many candidates (and some teachers commenting in feedback forms) chose answer A, but this is to confuse a plateau on the graph with a decrease to zero. Perhaps the term ‘rate’ was not understood and it was thought that the graph showed cumulative absorption of carbon dioxide. This is another question where more than straight factual recall is required.

Syllabus sections

Core » Topic 2: Molecular biology » 2.9 Photosynthesis

Show 61 related questions

Hide related questions

Core » Topic 2: Molecular biology

Core

Question

Markscheme

Examiners report

Syllabus sections

View options