DP Biology (last assessment 2024)

Test builder »

Question 18N.2.HL.TZ0.4e.i

Select a Test
Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.2.HL.TZ0.4e.i
Level HL Paper 2 Time zone TZ0
Command term Sketch Question number e.i Adapted from N/A
e.i.
[Maximum mark: 2]
18N.2.HL.TZ0.4e.i

Boreal forests stretch across Canada, Russia and Scandinavia. This northern ecosystem accounts for 29 % of the world’s forest areas. The long, cold winters favour tall evergreen trees with either needles or scale-like leaves. These trees are wind-pollinated and their seeds are not enclosed in a fruit. The photograph shows a typical boreal forest in winter.

(e.i)

The boreal forests are situated close to the north pole and even in summer the intensity of sunlight is lower than at the equator. Sketch a graph showing the effect of light on the rate of photosynthesis, labelling the axes.

[2]

Markscheme

a. x-axis labelled as light intensity/amount of light AND y-axis labelled as rate of photosynthesis/rate of oxygen release/rate of carbon dioxide uptake ✔

b. curve starting at/slightly to the right of the x-axis origin and rising rapidly and then more slowly and plateauing but never dropping ✔

Syllabus sections